Fractured rock mass permeability test method capable of simulating complex disturbance conditions

Abstract

The invention discloses a fractured rock mass permeability test method capable of simulating complex disturbance conditions. A static load test and an in-situ disturbance load test or a dynamic load test and an in-situ disturbance load test can be realized on the basis of an independent static load test or dynamic load test, and then the static load, the impact load, the long-time stable load, theperiodic pulse and vibration load, the actually measured disturbance load, the seepage pressure and other environments of the fractured rock mass under the complex in-situ disturbance conditions canbe accurately simulated; the disturbance load control precision is high, the dynamic load simulation complexity is high, the monitoring data is comprehensive, and the automation degree is high; the response law and mechanism of the seepage pressure gradient in the fractured rock mass under the action of complex dynamic loads in various rock sample mixed layered arrangement forms can be conveniently researched, and an important test platform and more accurate test data can be provided for researching key scientific problems such as permeability of a cemented fractured rock mass reconstitution water-resisting layer.

Description

technical field [0001] The invention relates to a rock mass test device, in particular to a compaction and permeability coupling test device for simulating a broken rock mass under complex in-situ disturbance and impact load, and belongs to the field of geotechnical engineering test technology and equipment. Background technique [0002] During the mining of underground resources, the overlying strata in the goaf will move violently under the mine pressure, resulting in roof fracture and collapse, which will damage the groundwater system. After the broken rock mass stabilizes, it will be under the action of the upper strata load With gradual compaction, the permeability of the collapsed and broken rock mass also changes significantly. During the seepage process of water in the broken rock mass, it is often accompanied by the loss of particles of different particle sizes, which causes the rearrangement and compaction characteristics of the particles inside the broken rock mass...

AI Technical Summary

Problems solved by technology

[0004] However, the existing test devices and methods cannot conduct systematic tests on the coupling problem of broken rock mass-hydraulic power, which seriously restricts the development of green mining theory and technology.

The main problems are manifested in the following aspects: ①The universal testing machine is usually used for testing, and the adaptability of the equipment is poor, and it is impossible to carry out the coupling test of compaction, penetration and dynamics on the broken rock mass at the same time; ②The existing test technology is usually to simplify The final impact dynamic load is applied to the rock mass sample. The control and application of the dynamic load is not accurate, and the load form is simple. The rock mass cannot reflect the actual situation, which leads to a large deviation between the experimental results and the actual situation; ③The parameters obtained by monitoring are single. At this stage, the monitoring results of the broken rock mass test are mostly the inlet and outlet liquid pressure, flow rate, static load capacity of the testing machine, Displacement, mass loss of particles that do not control the particle size, etc., but cannot determine the fractal characteristics of particle rupture that determine the seepage characteristics of the broken rock mass, seepage path on the surface of the cylinder wall, seepage pressure distribution inside the pressure chamber, mass loss of particles that control the maximum particle size, pressure The important parameters such as pressure and vibration characteristics of the chamber wall are monitored; ④ installation and disassembly are difficult and the test efficiency is low. Due to the high rigidity required for the crushed rock pressure chamber, the thickness and weight of each part of the pressure chamber are relatively large, and manual installation and disassembly are difficult. Moreover, after the compaction test, the broken rock mass forms a vacuum locally, which increases the difficulty of disassembly; ⑤ The operation problems such as the broken particles clogging the lower permeable plate and pipelines are prominent, which affects the accuracy of the test data

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