CN-122020772-A - Building structure design method considering goaf residual deformation

CN122020772ACN 122020772 ACN122020772 ACN 122020772ACN-122020772-A

Abstract

The invention belongs to the field of building structure design, and particularly relates to a building structure design method considering goaf residual deformation, which comprises the steps of building a building structure integral model, inputting goaf residual deformation prediction data in an upper building structure model, setting goaf building model parameters including an upper structural member deformation design and a building foundation deformation design, judging whether the upper structural member deformation design meets the design requirement, entering the next step if the upper structural member deformation design meets the design requirement, otherwise, adjusting the rigidity of a structural system and members until the structural member deformation design meets the design requirement, entering the next step if the structural member deformation design meets the design requirement, otherwise adopting foundation reinforcement and deformation resistance measures until the requirement is met, carrying out upper building structure internal force design, carrying out reinforcement design, and generating a final upper building model.

Inventors

LEI BING
WEI QIANG
LI QINGJUN
ZHANG YANG
WANG ZHENYU
YU DESHUN
LI GUOGUANG
XU CHENGQIANG

Assignees

同圆设计集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251208

Claims (10)

1. The building structure design method taking the goaf residual deformation into consideration is characterized by comprising the following steps of: step 1, building a goaf building model, and inputting goaf residual deformation prediction data; Step 2, setting goaf building model parameters, including deformation design of an upper structural member and deformation design of a building foundation; Step 3, judging whether the deformation design of the upper structure meets the design requirement or not, if so, entering the next step, otherwise, adjusting the rigidity of the structural system and the rigidity of the components until the structural system and the rigidity of the components meet the requirement, judging whether the deformation design of the building foundation meets the design requirement, if so, entering the next step, otherwise, adopting foundation reinforcement and deformation resistance measures until the structural system and the rigidity of the components meet the requirement; step4, designing internal force of the upper building structure; step 5, designing reinforcement; step 6 generates the final upper building model.
2. The method of claim 1, wherein the design of the deformation of the building foundation comprises calculation of the deformation of the building foundation of the goaf and the deformation limit value of the building foundation of the goaf.
3. The method for designing a building structure taking goaf residual deformation into consideration as claimed in claim 2, wherein the goaf building foundation deformation is calculated as follows: wherein: -foundation deformation values under upper load can be calculated according to the building foundation design Specification; -goaf residual deformation quasi-permanent value coefficients; -gob residual deformation.
4. The method for designing a building structure taking goaf residual deformation into consideration according to claim 1, wherein the goaf building upper structure member deformation design comprises goaf building upper structure horizontal displacement calculation and limit requirement, goaf building upper structure member deflection calculation and limit requirement, goaf building upper structure member crack calculation and limit requirement.
5. The method for designing a building structure taking the residual deformation of a goaf into consideration as claimed in claim 4, wherein the method for calculating the horizontal displacement of the upper structure of the goaf building and the limit requirement is as follows: The goaf building superstructure horizontal displacement can be calculated as follows: wherein: -a value of horizontal displacement of the superstructure under wind load; -goaf residual deformation quasi-permanent value coefficients; -a horizontal displacement of the superstructure caused by the residual deformation of the goaf; the upper structure horizontal displacement checking calculation of the goaf building meets the following formula requirement: wherein: The upper structure horizontal displacement limit can be taken according to the current specifications.
6. The method of building structure design taking into account goaf residual deformation as claimed in claim 4, wherein the goaf The deflection calculation and limit requirement calculation method of the building upper structural member comprises the following steps: The deflection of the upper structural member of the goaf building can be calculated according to the following formula: wherein: -the value of the mid-span deflection of the upper structural member under the action of the vertical constant live load can be calculated according to the current specifications; -a mid-span deflection value of the upper structural member caused by goaf residual deformation; Calculating mid-span deflection of upper structural member caused by goaf residual deformation When the method is used, the software calculation result is firstly used for extracting the additional bending moment of the corresponding position of the horizontal component under the residual deformation working condition of the goaf The additional internal forces under the corresponding quasi-permanent combination are: = wherein: -goaf residual deformation quasi-permanent value coefficients; then substituting the additional internal force under the corresponding combination into a standard deflection calculation formula to calculate the deflection value of the upper structural member under the residual deformation action of the goaf ; The deflection checking calculation of the upper structural member of the goaf building meets the following requirements: wherein: the upper structural member deflection limit can be taken as per current specifications.
7. The method of building structure design taking into account goaf residual deformation as claimed in claim 4, wherein the goaf The method for calculating the crack and the limit value requirement of the structural member at the upper part of the building comprises the following steps: considering the long-term effect of the residual deformation of the goaf in the design service life, the goaf is combined with other vertical loads by adopting a quasi-permanent combination, and the deflection of the structural member on the upper part of the goaf building can be calculated according to the following formula: wherein: -the upper structural member crack value under the action of the vertical constant live load can be calculated according to the current specification; -a value of upper structural member cracking under the residual deformation of the goaf; considering that the horizontal component is a stretch-bent component, calculating the midspan crack of the upper structural component caused by goaf residual deformation When the method is used, the software calculation result can be used for extracting the additional bending moment and the additional axial force of the corresponding position of the horizontal component under the residual deformation working condition of the goaf The additional internal forces under the corresponding quasi-permanent combination are: = = wherein: -goaf residual deformation quasi-permanent value coefficients; then substituting the additional internal force under the corresponding combination into a standard fracture calculation formula to calculate the fracture value of the upper structural member under the residual deformation action of the goaf ; The crack checking calculation of the structural member at the upper part of the goaf building meets the following formula: wherein: -upper structural member crack limit value, which can be taken according to current specifications.
8. The architectural structure design method considering goaf residual deformation according to any one of claims 3, 5, 6 and 7, wherein the goaf residual deformation action quasi-permanent value coefficient is closely related to goaf state, and the goaf is smaller in the more stable combination value coefficient, and the goaf residual deformation action quasi-permanent value coefficient takes value; When the goaf is in the active period, the sedimentation rate is large (more than or equal to 1.0 mm/d) and no attenuation sign exists, and the coefficient of the quasi-permanent value is high The value range is 0.7-0.9; When the goaf state is in the decay period, the sedimentation rate is slower (less than or equal to 1.0mm/d and gradually decays, and the accumulated subsidence of continuous 6 months is more than or equal to 30 mm) and continuously decays, and the quasi-permanent value coefficient of the structural design when the service life is 25 years The value range is 0.5-0.6, and the service life of the structural design is 50 years, and the quasi-permanent value coefficient is the same The value range is 0.6-0.7; When the goaf state is in the stable period, the sedimentation rate is slow (less than or equal to 0.2mm/d and gradually decays, and the accumulated sinking is less than 30mm after 6 months continuously), and the quasi-permanent value coefficient is 25 years when the service life of the structural design is 25 years The value range is 0.4-0.5, and the service life of the structural design is 50 years, and the quasi-permanent value coefficient is the same The value range is 0.5-0.6, and the service life of the structural design is 100 years, the quasi-permanent value coefficient The value range is 0.6-0.7.
9. The method for designing a building structure taking goaf residual deformation into consideration as claimed in claim 1, wherein the method for designing the internal force of the upper building structure is as follows: the method comprises the steps of comparing the internal force of a support part under the residual deformation working condition of the goaf with the internal force under the earthquake working condition, and combining an envelope value with the internal force under other working conditions; for the vertical supporting member, the internal force under the goaf residual deformation working condition is used as a special live load to be combined with the internal force under the earthquake working condition and other working conditions.
10. The method for designing a building structure taking into consideration residual deformation of a goaf as claimed in claim 9, When the residual deformation effect of the goaf is unfavorable, the subitem coefficient takes the following values: When the goaf is in the active period, the sedimentation rate is high (more than or equal to 1.0 mm/d) and no attenuation sign exists, and the term coefficients are calculated The value is 1.5; when the goaf state is in the decay period, the sedimentation rate is slower (less than or equal to 1.0mm/d and gradually decays, and the accumulated sedimentation for 6 months is more than or equal to 30 mm) and continuously decays, and the coefficient is divided into items The value is 1.4; when the goaf state is in the stable period, the sedimentation rate is slow (less than or equal to 0.2mm/d and gradually decays, and the accumulated sedimentation is less than 30mm for 6 continuous months) and the coefficient is divided The value is 1.3; when the residual deformation effect of the goaf is favorable, taking 0 as a subentry coefficient; The goaf residual deformation combined value coefficient is closely related to the goaf state, and the goaf is smaller in the more stable combined value coefficient, and the goaf residual deformation combined value coefficient is valued; When the goaf state is in the active period, the sedimentation rate is high (more than or equal to 1.0 mm/d) and no attenuation sign exists, and the value coefficients are combined The value range is 0.9-1.0; when the goaf state is in the decay period, the sedimentation rate is slower (less than or equal to 1.0mm/d and gradually decays, and the accumulated sedimentation for 6 months is more than or equal to 30 mm) and continuously decays, and the value coefficients are combined The value range is 0.7-0.9; when the goaf state is in the stable period, the sedimentation rate is slow (less than or equal to 0.2mm/d and gradually decays, and the accumulated sedimentation is less than 30mm for 6 continuous months) The value range is 0.6-0.7.

Description

Building structure design method considering goaf residual deformation Technical Field The invention belongs to the field of building design, and particularly relates to a building structure design method considering goaf residual deformation. Background When engineering construction is carried out in a mineral resource exploitation area, particularly above a goaf of an underground coal seam, the goaf foundation needs to be treated so as to ensure the safety of the building. At present, filling grouting is a mainstream technical means for treating goaf. However, the inventors have realized that even with conventional remediation, the treated goaf foundation cannot fully recover to the original ground stress balance state before mining due to the combined effects of the inherent compressibility of the filler material, the unavoidable packing incompact and non-uniformity in engineering implementation, the long-term "activation" effect caused by the stress adjustment of the underlying strata, and the change of the groundwater environment, etc., resulting in that the earth surface will still have continuous and long-term residual deformation due to the influence of the goaf in the service life of the building. Currently, there is a significant imbalance in the technological development in the art, in that predictive studies on the future deformation of the goaf earth's surface itself have been relatively mature, but there are serious specification deletions and under-studies on how to systematically consider and resist the effects of such deformation at the stage of structural design of the building. This directly results in the following key technical difficulties faced when constructing on goaf foundations: 1) The goaf building foundation deformation combination calculation method and deformation limit value are missing, namely the existing standard of technical Specification of the treatment of the goaf building foundation of a coal mine only prescribes the limit values of the deformation rate, horizontal deformation and inclination of the foundation after the goaf treatment, and the standard of the foundation design of the building foundation also prescribes the limit values of the settlement quantity and the settlement difference of the common building foundation. However, the specifications do not specify how to calculate the goaf residual deformation in combination with the self-settlement of the foundation caused by the building load, and how to determine the goaf building foundation settlement limit. This results in a lack of uniform basis for the designer to evaluate the overall deformation of the building foundation, resulting in a seamless follow-up of the building foundation design on the goaf foundation 2) The lack of the additional deformation evaluation standard of the upper structure of the goaf building is that the residual deformation (sinking and tilting) of the goaf ground surface can be transmitted to the upper structure, which is equivalent to the forced displacement applied to the vertical members (walls and columns) of the building. Such forced displacement may cause significant additional deformation in horizontal members such as beams, plates, etc. At present, how this additional deformation should be combined with deformation caused by other loads (such as static and live loads) and how its own deformation limit should be determined are all lacking in clear standard basis, which brings uncertainty to the safety evaluation of the superstructure. 3) The combination of additional internal forces and the design of the upper structure of the goaf building are more critical, and the forced displacement can generate non-negligible additional internal forces in the upper structure. The current structural design specifications provide for the combination of loading effects that do not include internal forces caused by goaf residual deformation. Therefore, how to quantitatively consider the influence of this additional internal force and combine it with the conventional load internal force is a blank in the current structural design theory. Neglecting this problem may result in a design that is not safe and presents a serious potential hazard. Disclosure of Invention The invention provides a systematic, quantitative and feasible building structure design method considering goaf residual deformation based on the technical problems of large goaf building treatment difficulty, high construction cost and more later hidden danger, and provides a basis for goaf upper building structure design. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the invention provides a building structure design method considering goaf residual deformation, which specifically comprises the following steps: step 1, building a goaf building model, and inputting goaf residual deformation prediction data; Step 2, setting goaf building model parameters, including deformation