Three-dimensional experimental system and experimental method for simulating plastic zone of surrounding rock of roadway

Abstract

The invention discloses a three-dimensional experimental system and experimental method for simulating a plastic zone of surrounding rock of a roadway. An axial loading cylinder of the system is connected with a support frame and a force transmission shaft, the lower end face of the force transmission shaft is connected with an axial compression sensor, an upper pressing head penetrates through a center through hole in the top of a shell of a side compression chamber, the bottom of the upper pressing head is connected with the upper end face of an experimental model, the top of the upper pressing head is connected with the axial compression sensor, a sealing ring is further connected between the upper pressing head and the through hole of the side compression chamber, an isolation rubber membrane encompassing the experimental model is connected between the upper pressing head and a lower pressing head, a hydraulic system is connected with the axial loading cylinder and the side compression chamber, and a multi-point displacement measuring system is connected through minisize high-precision multi-point displacement sensors in the data experimental model. The three-dimensional experimental system is more uniform in loading and high in loading intensity and meets model experiments in the deep high-stress environment under the three-dimensional condition, in particular to a high polarization stress field; real time data acquisition can be conducted, the measurement precision is high, and distribution characteristics and distribution rules of the plastic zone of the surrounding rock of the roadway can be effectively and accurately measured and simulated.

Description

technical field [0001] The invention relates to the field of deformation and stability control of the surrounding rock of the well and roadway engineering, in particular to a three-dimensional experimental system and an experimental method for simulating the plastic zone of the surrounding rock of the roadway. Background technique [0002] With the rapid development of the national economy and the continuous increase in energy demand, the scale and number of deep mine roadway projects are increasing day by day. According to relevant statistics, the total length of roadways with a new excavation depth below 600-800m exceeds 1000km. However, due to the strong influence of factors such as the deep complex geomechanical environment, the occurrence state of the roadway surrounding rock itself, and external mining activities, most of the roadway surrounding rocks have deep nonlinear large deformation failures and even nonlinear catastrophe accidents. , Such as collapse, large bot...

AI Technical Summary

Problems solved by technology

However, the indoor model experiment research on the distribution of the plastic zone in the prior art is still seriously lacking, mainly because the current roadway model experiment system has many defects and cannot meet the experimental requirements well. The performance is as follows: First, the model is loaded unevenly , the force boundary cannot satisfy the actual condition

The existing roadway model experiment system basically adopts the rigid loading method of the hydraulic cylinder, and the loading of the cylinder needs to be transferred in stages, and the performance difference of each cylinder and the difference in the force transmission mechanism may easily cause the model to not be completely uniformly loaded. At the same time, the cylinder loading plate Inconsistency with the deformation of the model boundary often causes the indoor model experiment to fail to meet the actual boundary conditions

The second is that the load concentration provided by the model experiment system is too small, and it is not possible to carry out model experiments in deep high-stress environments, especially high deviatoric stress fields, under three-dimensional conditions.

The third is that the whole process of the model experiment lacks an advanced high-precision deformation monitoring system for real-time measurement, and the monitoring results obtained by conventional model experiment displacement and strain measuring instruments are usually not ideal, and the distribution characteristics of the plastic zone of the surrounding rock of the roadway cannot be obtained. and distribution law

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