CN-121977925-A - Bidirectional excitation test loading device and method for true two-dimensional plane strain

CN121977925ACN 121977925 ACN121977925 ACN 121977925ACN-121977925-A

Abstract

The invention provides a bidirectional excitation test loading device and method for true two-dimensional plane strain, and relates to the technical field of excitation loading, wherein the bidirectional excitation test loading device comprises a bottom plate, a bottom plate bearing platform, a first guide groove, a second guide groove, a front fixed side plate, a rear fixed side plate, a first sliding rail, a right fixed side plate, an auxiliary sliding block, a second sliding rail, a horizontal loading plate, an inverted L-shaped clamping groove, an inverted L-shaped rubber strip, a cuboid rock soil sample and a vertical loading plate; the bottom plate bearing platform is placed on the bottom plate, two first guide grooves perpendicular to the long side are respectively formed in two sides of the long side of the bottom plate bearing platform at intervals, two second guide grooves perpendicular to the short side are respectively formed in two sides of the short side of the bottom plate bearing platform at intervals, two first sliding rails are respectively arranged below the front fixed side plate and the rear fixed side plate at intervals, two second sliding rails are respectively arranged below the right fixed side plate and the auxiliary sliding block at intervals, and the horizontal loading plate and the vertical loading plate are used for applying horizontal dynamic load and vertical dynamic load to cuboid rock soil samples.

Inventors

PAN DANGUANG
Xi Shuheng
LIU MENGHAN
ZHANG HONGJIAO
YUAN XIANG

Assignees

北京科技大学

Dates

Publication Date: 20260505
Application Date: 20260309

Claims (10)

1. The loading device for the two-way excitation test of the true two-dimensional plane strain is characterized by comprising a bottom plate, a bottom plate bearing platform, a first guide groove, a second guide groove, a front fixed side plate, a rear fixed side plate, a first sliding rail, a right fixed side plate, an auxiliary sliding block, a second sliding rail, a horizontal loading plate, an inverted L-shaped clamping groove, an inverted L-shaped rubber strip, a cuboid rock soil sample and a vertical loading plate; the bottom plate bearing platform is arranged on the bottom plate; Two sides of the long side of the bottom plate bearing table are respectively provided with two first guide grooves perpendicular to the long side at intervals; two sides of the short side of the bottom plate bearing platform are respectively provided with two second guide grooves perpendicular to the short side at intervals; Two first sliding rails are arranged below the front fixed side plate and the rear fixed side plate at intervals; the first sliding rail drives the front fixed side plate and the rear fixed side plate to slide in the first guide groove along the length direction of the first guide groove; two second sliding rails are arranged below the right fixed side plate and the auxiliary sliding block at intervals; the second sliding rail drives the right fixed side plate and the auxiliary sliding block to slide in the second guide groove along the length direction of the second guide groove; The cuboid rock-soil sample is arranged on the bottom plate bearing platform; the inverted L-shaped rubber strip is embedded into the inverted L-shaped clamping groove of the horizontal loading plate; the horizontal loading plate is arranged on the auxiliary sliding block; The vertical loading plate is arranged at the top of the cuboid rock-soil sample; The horizontal loading plate and the vertical loading plate are used for applying horizontal and vertical dynamic loads to the cuboid rock-soil sample.
2. The loading device for the bidirectional excitation test of true two-dimensional plane strain according to claim 1, wherein the positions of the first guide grooves arranged on the two sides of the long side of the bottom plate bearing table are symmetrical with each other; the second guide grooves are symmetrically arranged on the two sides of the short side of the bottom plate bearing platform.
3. The device according to claim 1, wherein the first slide rail corresponds to the first guide groove, and the size of the first slide rail is smaller than or equal to the corresponding size of the first guide groove; the second sliding rail 1 corresponds to the second guiding groove, and the size of the second sliding rail is equal to the corresponding size of the second guiding groove.
4. The true two-dimensional planar strained bi-directional excitation test loading device of claim 1, wherein the front and rear fixed side plates are embedded in the first guide slot; The right fixed side plate and the auxiliary sliding block are embedded in the second guide groove.
5. The device for loading the true two-dimensional plane strain bi-directional excitation test according to claim 1, wherein the top end of the horizontal loading plate is provided with the inverted-L-shaped clamping groove; The size of the inverted L-shaped clamping groove is equal to that of the inverted L-shaped rubber strip; The inverted L-shaped rubber strip is embedded into the inverted L-shaped clamping groove of the horizontal loading plate.
6. The device for loading the true two-dimensional plane strain bi-directional excitation test according to claim 1, wherein the auxiliary slide block and the bottom plate bearing platform have the same height; the bottom of the horizontal loading plate and the bottom of the cuboid rock-soil sample keep the same height.
7. The true two-dimensional plane strain bi-directional excitation test loading device according to, wherein the front fixed side plate and the rear fixed side plate are made of transparent organic glass; The front fixed side plate, the rear fixed side plate and the right fixed side plate are fixed by an actuator.
8. The device for loading the true two-dimensional plane strain bi-directional excitation test according to claim 1, wherein the dimension of the upper surface of the bottom plate bearing platform is equal to the dimension of the bottom surface of the cuboid geotechnical sample.
9. The method for loading the bidirectional excitation test of the true two-dimensional plane strain according to claim 1, which is applied to the bidirectional excitation test loading device according to any one of claims 1 to, comprises the following steps: S1, marking a preset number of uniformly distributed mark points in a preset area between the front side of the cuboid rock-soil sample and the middle; S2, determining the initial position of the mark point through a super-high-speed digital camera; s3, applying horizontal and vertical dynamic loads to the cuboid rock and soil sample through the horizontal loading plate and the vertical loading plate so as to enable the cuboid rock and soil sample to move; s4, determining the real-time position of the mark point in the motion process through the ultra-high-speed digital camera; S5, converting the initial position and the real-time position through a computer to obtain an image signal; And S6, obtaining the dynamic stress-dynamic strain relation of the cuboid rock-soil sample mark points according to the image signals through a computer.
10. A readable storage medium having stored thereon a program or instructions which when executed by a processor performs the steps of the true two-dimensional planar strain bi-directional excitation test loading method of claim 9.

Description

Bidirectional excitation test loading device and method for true two-dimensional plane strain Technical Field The invention relates to the technical field of excitation loading, in particular to a bidirectional excitation test loading device and method for true two-dimensional plane strain. Background The dynamic constitutive model of the soil body is a core parameter which accurately reflects the nonlinear mechanical characteristics of the field under the action of an earthquake, and the earthquake response of the transverse uneven field in the actual engineering essentially belongs to the problem of two-dimensional plane strain under the action of dynamic stress. In order to establish a nonlinear constitutive relation of a soil body attached to an actual working condition, a dynamic response rule of the soil body in a complex stress state is accurately revealed, and development of targeted dynamic stress test research becomes a necessary requirement in the field. At present, the research of soil body constitution under complex stress state in the industry is mainly carried out by two types of test means, namely a general conventional dynamic triaxial test and a true triaxial test, wherein the research application of the true triaxial test is mainly based on test analysis under the action of static load, and the research of the true dynamic triaxial test aiming at the working condition of dynamic load does not form a mature system yet. However, the existing true triaxial test loading device enables at least three sides of a rock-soil sample to have corner effects, so that the reliability of test results is obviously affected, and in addition, the dynamic stress-dynamic strain of soil under complex stress is difficult to measure during two-dimensional field seismic response analysis. Disclosure of Invention The invention provides a bidirectional excitation test loading device and method for true two-dimensional plane strain, which are used for solving the problem that the reliability of the test result is obviously affected by the corner effect of at least three sides of a rock-soil sample caused by a true triaxial test loading device under the condition that the conventional dynamic triaxial test cannot reflect the change rule of the dynamic modulus and damping ratio of soil under different main stress ratios and the true triaxial test research is not mature, and solving the problem of measuring the dynamic stress-dynamic strain of the soil under complex stress during the earthquake reaction analysis of a two-dimensional field. The technical scheme provided by the embodiment of the invention is as follows: The bidirectional excitation test loading device for the true two-dimensional plane strain comprises a bottom plate, a bottom plate bearing platform, a first guide groove, a second guide groove, a front fixed side plate, a rear fixed side plate, a first sliding rail, a right fixed side plate, an auxiliary sliding block, a second sliding rail, a horizontal loading plate, an inverted L-shaped clamping groove, an inverted L-shaped rubber strip, a cuboid rock soil sample and a vertical loading plate. The base plate bearing platform is arranged on the base plate. Two sides of the long side of the bottom plate bearing table are respectively provided with two first guide grooves perpendicular to the long side at intervals. Two second guide grooves perpendicular to the short sides are respectively arranged on two sides of the short sides of the base plate bearing platform at intervals. Two first sliding rails are arranged below the front fixed side plate and the rear fixed side plate at intervals. The first sliding rail drives the front fixed side plate and the rear fixed side plate to slide in the first guide groove along the length direction of the first guide groove. Two second sliding rails are arranged below the right fixed side plate and the auxiliary sliding block at intervals. The second slide rail drives the right fixed side plate and the auxiliary slide block to slide along the length direction of the second guide groove in the second guide groove. The cuboid rock soil sample is arranged on the bottom plate bearing platform. The inverted L-shaped rubber strip is embedded into the inverted L-shaped clamping groove of the horizontal loading plate. The horizontal loading plate is arranged on the auxiliary sliding block. The vertical loading plate is arranged at the top of the cuboid rock-soil sample. The horizontal loading plate and the vertical loading plate are used for applying horizontal and vertical dynamic loads to the cuboid rock and soil sample. The bidirectional excitation test loading method for true two-dimensional plane strain provided by the second aspect of the embodiment of the invention comprises the following steps: S1, marking a preset number of uniformly distributed mark points in a preset area between the front side and the middle of the cuboid rock-soil sample. S2, determining the ini