CN-121997411-A - Method, system, electronic equipment and storage medium for calculating anchorage stability of bearing and undersolidified stratum

CN121997411ACN 121997411 ACN121997411 ACN 121997411ACN-121997411-A

Abstract

The invention discloses a method, a system, electronic equipment and a storage medium for calculating the anchorage stability of a pressure-bearing and under-consolidation stratum, wherein the method comprises the steps of S100, constructing a hydraulic and soil pressure calculation model considering the influences of under-consolidation and pressure-bearing water, calculating the effective soil pressure, pore water pressure and total pressure at any depth z in the pressure-bearing and under-consolidation stratum, finally obtaining a hydraulic and soil pressure distribution rule, S200, accurately calculating the forces acting on each interface of an anchorage foundation based on the hydraulic and soil pressure distribution rule through integral operation, S300, establishing a mechanical balance equation of the anchorage in the horizontal direction according to a limit balance theory, deriving an analytical expression of an integral anti-slip stability coefficient containing all key parameters, S400, constructing a calculation formula of the anti-slip stability coefficient based on the established balance equation, and applying the calculation formula to three core scenes according to different engineering requirements. And a water and soil pressure calculation model is constructed, and a mechanical balance system of all stress surfaces of the anchorage is established.

Inventors

WANG QIANG
LI YANDE
ZHU YINGHAO
LIU SHUANG
ZHOU YANFENG
Lu Xingbang
FU BAIYONG
HAN DONGDONG
HUA XIN
TANG ZHENG
Ye hengda
Xue Xianxin

Assignees

江苏省交通工程建设局
华设设计集团股份有限公司
中交公路长大桥建设国家工程研究中心有限公司

Dates

Publication Date: 20260508
Application Date: 20251223

Claims (10)

1. The calculation method for the anchorage stability of the pressure-bearing under-consolidated stratum is characterized by comprising the following steps of: s100, constructing a water and soil pressure calculation model considering the influences of under-consolidation and pressure-bearing water, calculating the effective soil pressure, pore water pressure and total pressure in the vertical and horizontal directions at any depth z in the pressure-bearing under-consolidation stratum, and finally obtaining a water and soil pressure distribution rule; s200, accurately calculating the forces acting on all interfaces of the anchorage foundation through integral operation based on the water and soil pressure distribution rule; s300, establishing a mechanical balance equation of the anchorage in the horizontal direction according to a limit balance theory, and deducing an analytical expression of the integral anti-slip stability coefficient containing all key parameters; S400, constructing a calculation formula of an anti-slip stability coefficient based on the established balance equation, and applying the calculation formula to three core scenes according to different engineering requirements to calculate the gravity type anchorage stability of the bearing and undersolidified stratum.
2. The method for calculating the anchorage stability of the pressure-bearing and undersolidified stratum according to claim 1, wherein in the step S100, stratum parameters are required to be collected and determined firstly, then the classical Rankine or Coulomb soil pressure theory is corrected based on a water-soil calculation principle, and the water-soil pressure is calculated; The stratum parameters are as follows: , Wherein, the The unit is kN/m 3 which is the effective weight of the ith layer of soil; the thickness of the ith layer of soil is m, When 0, the position represents the ground surface; is the effective internal friction angle of the ith layer of soil; is the lateral pressure coefficient of the ith layer of soil; The effective cohesive force of the ith layer of soil; the degree of consolidation of the i-th layer soil is the effective vertical stress/total vertical stress; The water head height of the ith layer of soil is given by the unit m, and the subsurface is positive; lateral pressure coefficient of the ith layer of soil The following three cases are adopted: Taking when the pressure coefficient of the static soil is equal to the pressure coefficient of the static soil , Taking when the soil pressure coefficient is equal to the passive soil pressure coefficient , Taking when the soil pressure coefficient is equal to the active soil pressure coefficient , Effective gravity through the ith layer of soil And the thickness of the ith layer of soil Calculating to obtain the sum of the effective weights of the upper soil, wherein the sum is specifically as follows: , Wherein, the The sum of the effective weights of the upper cover soil, kPa, The depth coordinate is positive from the surface to the bottom, and the unit is m; Is the depth of the top of the ith layer; And simultaneously calculating the pressure of the pressure-bearing water to be: Wherein, the In order to bear the pressure of the water pressure, Is the weight of water.
3. The method for calculating the anchorage stability of a pressure-bearing and under-consolidated formation according to claim 2, wherein the water-soil pressure is calculated as the sum of the effective weights of the upper earth based on a water-soil division principle With pressure of pressurized water Calculating the under-consolidated soil-water pressure of the i-layer soil above the bottom of the anchorage foundation, which specifically comprises the following steps: vertical soil and water pressure acting at depth z : ; For a horizontal soil and water pressure acting at depth z: ; for taking into account the effective cohesion The corresponding calculation formulas of the active water and soil pressure and the passive water and soil pressure are as follows: Active water and soil pressure on back of anchorage foundation : , For active soil and water pressure, critical calculation depth is also needed to be considered, wherein the critical calculation depth is as follows: , When (when) At the time, take ; Passive water-soil pressure of earth facing surface of anchorage foundation : 。
4. The method for calculating the anchorage stability of the pressure-bearing and under-consolidation stratum according to claim 3, wherein in the step S200, the total force of the passive water and soil pressure and the total force of the active water and soil pressure of the i-layer soil above the bottom of the anchorage foundation are calculated, at the moment, the top of the anchorage foundation is flush with the ground surface, the vertical coordinate axis is downward positive, the integral calculation is carried out on the front surface and the bottom surface from top to bottom, the length of the anchorage foundation in the horizontal direction is L, the unit is m, the width of the anchorage foundation is B, the unit is m, the dead weight of the anchorage is W, and the unit is N; The forces acting on each interface of the anchorage foundation comprise a passive hydraulic and soil pressure resultant force of a soil facing surface, an active hydraulic and soil pressure resultant force, a friction force resultant force of two side surfaces and a friction force resultant force of a bottom surface.
5. The method for calculating the anchorage stability of a pressure-bearing and under-consolidation stratum according to claim 4, wherein the resultant force of the passive water and soil pressure of the earth facing surface The method comprises the following steps: ; the active water and soil pressure resultant force The method comprises the following steps: ; The frictional force resultant force of the two side surfaces needs to be obtained by integrating the side surfaces of the anchorage foundation, and the method specifically comprises the following steps: , Wherein, the For shear strength, which is a frictional force according to the molar coulomb strength criterion, said shear strength The method comprises the following steps: , Wherein, the In order to be effective in terms of lateral earth pressure, Is the interface friction angle of the side soil-anchorage structure, Is the coefficient of friction; the effective lateral soil pressure Horizontal soil and water pressure through the sides Removing pressure of pressure-bearing water After that, the horizontal soil and water pressure is obtained The method comprises the following steps: , the effective lateral soil pressure The method comprises the following steps: 。
6. The method for calculating the anchorage stability of a confined or less consolidated formation according to claim 5, wherein the frictional force of the bottom surface is resultant force The method comprises the following steps: , Wherein, the For the upward buoyancy generated by the pressure-bearing water in the soil body around the anchorage foundation, For the purpose of the cable force, Is the included angle between the cable force direction and the horizontal direction, The cable force in the vertical direction is the cable force, Is the dead weight of the anchorage foundation, Is the adhesive force of the bottom surface of the anchorage foundation, The friction angle is the bottom surface friction angle of the anchorage foundation; buoyancy force generated by pressure-bearing water in soil body around anchorage foundation The stress balance of the anchorage foundation is analyzed under the action of cable force, the vertical direction is subjected to the action of dead weight, pressure-bearing water buoyancy and vertical cable force, and the concrete steps are as follows: , The difference value between the dead weight of the anchorage foundation and the buoyancy of the surrounding soil body bearing water is larger than the vertical component of the cable force, so that the stress balance analysis is carried out in the vertical direction, and the requirements are satisfied: 。
7. The method for calculating the anchorage stability of the pressure-bearing and under-consolidation stratum according to claim 6, wherein in the step S300, the coefficient of the anti-slip stability is firstly determined according to the basic design specification of the bridge abutment, specifically: , Wherein, the In order to be a coefficient of stability against slipping, For the sum of the anti-skid stable horizontal forces, Is the sum of sliding horizontal forces; and then carrying out cable force stress balance analysis in the horizontal direction, and substituting related data into the anti-slip stability formula to carry out calculation analysis, wherein the calculation analysis comprises the following steps of: , According to the analysis of the stress balance of the cable force in the horizontal direction, the total sum of the anti-skid stable horizontal force The method comprises the following steps: , The sum of the sliding horizontal forces The method comprises the following steps: 。
8. a system for calculating the anchorage stability of a bearing under-consolidated formation, for implementing a method for calculating the anchorage stability of a bearing under-consolidated formation according to any one of claims 1 to 7, comprising: The pressure calculation module is used for constructing a water and soil pressure calculation model considering the influence of the under-consolidation and the pressure-bearing water, calculating the vertical total stress, the pore water pressure and the horizontal effective soil pressure at any depth z in the pressure-bearing under-consolidation stratum, and finally obtaining a water and soil pressure distribution rule; The transformation operation module is used for accurately calculating the forces acting on each interface of the anchorage foundation through integral operation based on the water and soil pressure distribution rule; the deduction analysis module is used for establishing a mechanical balance equation of the anchorage in the horizontal direction according to the limit balance theory and deducing an analysis expression of the integral anti-slip stability coefficient containing all key parameters; The stability calculation module is used for constructing a calculation formula of an anti-slip stability coefficient based on the established balance equation, and applying the calculation formula to three core scenes according to different engineering requirements to calculate the gravity type anchorage stability of the bearing and under-consolidation stratum.
9. An electronic device, comprising At least one memory for storing a computer program; At least one processor for implementing the steps of a method for calculating the anchorage stability of a confined under-consolidated formation according to any of claims 1-7 when executing said computer program.
10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, which when executed by a processor, implements the steps of a method for calculating the anchorage stability of a confined under-consolidated formation according to any one of claims 1 to 7.

Description

Method, system, electronic equipment and storage medium for calculating anchorage stability of bearing and undersolidified stratum Technical Field The invention belongs to the technical field of stratum anchorage, and particularly relates to a method, a system, electronic equipment and a storage medium for calculating the anchorage stability of a pressure-bearing under-consolidated stratum. Background As infrastructure construction extends into soft soil foundation areas such as coastal, river-like areas, more and more pressure bearing under-consolidated formations are encountered in engineering practice. Such formations are often composed of highly compressible saturated soft soils (e.g., silt, mucky soil) and are typically characterized by a high natural water content, a high pore ratio, low strength, a low degree of consolidation (i.e., "under-consolidation") and are often populated with pressurized water under pressure. The gravity type anchorage foundation is used as a key stress component of structures such as a large-span suspension bridge, a cable-stayed bridge and the like, and has the main function of providing stable and reliable anchoring force for an upper structure by utilizing huge weight of the gravity type anchorage foundation and interaction with a foundation soil body. However, the construction of such heavy foundations in pressure-bearing under-consolidated formations presents serious technical challenges: (1) The traditional Rankine (Rankine) or Coulomb (Coulomb) soil pressure theory is mainly applicable to normally consolidated or super-consolidated sandy soil and cohesive soil, and the soil body is assumed to complete consolidation settlement. However, for an under consolidated formation, because the earth framework has not fully assumed the overburden load, the pore water pressure is much higher than the hydrostatic pressure, resulting in a significant reduction in effective stress. If the traditional theory is still used, the shear strength parameters (such as an internal friction angle phi and a cohesive force c) of the soil body are seriously overestimated, and then the anti-slip force (such as passive soil pressure) of the anchorage is overestimated, so that unsafe design is caused. (2) The influence of the pressure-bearing water in the stratum not only can generate extra pore water pressure, but also can generate direct buoyancy force on the anchorage foundation, and reduces the effective normal stress of the bottom surface of the foundation, thereby obviously weakening the important anti-skid force source of the friction resistance of the bottom surface. In addition, the construction environment is also deteriorated by the pressure-bearing water, and the difficulty of excavation and support of the foundation pit is increased. (3) The limitations of existing computing methods are that at present, design methods for such formations are mostly empirical or simplified treatments. For example, a reduced soil body strength index is adopted, or water and soil pressure is simply overlapped, and a set of systematic calculation theory capable of uniformly considering the dual adverse factors of 'under consolidation' and 'pressurized water' is lacked. This results in either too conservative design results, resulting in unnecessary engineering wastage, or a risk, leaving serious safety hazards to the structure. Therefore, a gravity type anchorage stability calculation method capable of accurately reflecting the characteristics of the pressure-bearing and under-consolidated stratum is urgently needed, so that the safety and the economical efficiency of engineering design are ensured. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a method, a system, electronic equipment and a storage medium for calculating the anchorage stability of a pressure-bearing and under-consolidation stratum, which are used for constructing a water and soil pressure calculation model closer to the actual engineering by systematically introducing two core variables of the under-consolidation degree and the pressure-bearing water head, and establishing a complete mechanical balance system covering all stress surfaces of the anchorage on the basis. Compared with the traditional simplified method, the method has stronger theoretical rigor and model integrity, and can remarkably improve the accuracy of stability analysis. Meanwhile, the invention clearly explains the specific application flow of the anti-skid stability coefficient in three layers of theoretical limit analysis, engineering design value and built structure checking calculation, provides a complete, reliable and practical technical scheme for solving the problem of heavy foundation design under complex geological conditions, and has important value for improving the safety and economy of important infrastructure. In order to achieve the above object, according to a first aspect of the embodiment