Manufacture method for random micro-fissure rock mass physical model

Abstract

The invention discloses a manufacture method for a random micro-fissure rock mass physical model, and belongs to the technical field of geotechnical engineering. The manufacture method comprises the following steps that: firstly, preparing first mortar and a plastic film, and manufacturing a test block containing a micro-fissure; then, dipping the test block containing the micro-fissure; preparingsecond mortar which has the same mix proportion with the test block containing the micro-fissure; thirdly, evenly stirring the test block containing the micro-fissure and the second mortar, and putting mixture in a mould for forming; and finally, after initial set is carried out, carrying out mould removal, curing in a constant-temperature constant-humidity curing box, and carrying out random micro-fissure rock mass physical model forming. By use of the manufacture method, through the first mortar and the plastic film, the test block containing the micro-fissure is firstly manufactured, then,the first mortar and the second mortar with the same proportion are mixed, and therefore, the problem of uneven fissure distribution is solved since the first mortar and the second mortar are almostthe same. The amount and the geometrical shape of the fissures in the random micro-fissure rock mass are the same with the practical rock mass which needs to be simulated so as to be convenient in regulating the amount and the geometrical shape of the fissures to more conform to the fissure distribution of the practical engineering rock mass.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for making a physical model of a rock mass with random micro-cracks. Background technique [0002] In nature, due to various geological processes, there are a large number of randomly distributed cracks, joints and microcracks inside the rock mass. However, most rock materials are regarded as homogeneous bodies in mechanical analysis and experimental research, which is very different from rock mass materials in actual engineering, resulting in large errors when the results are applied to actual engineering. Especially in deep underground engineering with complex geological conditions, there are a large number of random micro-cracks in rock mass, and cracks, joints and micro-cracks become weak links in rock mass, which pose a great threat to the safety of deep underground engineering. In order to effectively evaluate the safety of deep underground engine...

AI Technical Summary

Problems solved by technology

The density difference between the tin bars and the mortar used in this method is relatively large, and the tin bars are prone to float or sink, and it is difficult for cracks to be randomly distributed in the rock mass.

[0005] The Chinese patent application with the application number 201310721631.8 "A Method for Preparing a Random Crack Test Model" discloses a method for simulating cracks by using mica sheets or polytetrafluoroethylene sheets. This method also has crack material and matrix material densities big difference

And mica sheet or polytetrafluoroethylene sheet has a certain strength, which will affect the mechanical properties of fractured rock mass to a certain extent.

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