In situ testing method of rock mass permeability

Abstract

The invention belongs to the technical field of rock body destroy range and permeability test and discloses an in-situ testing method for permeability of a rock body. The device comprises a testing probe, a propelling mechanism and a control mechanism, wherein the testing probe comprises a rubber capsule, a drain pipe, a converter and a communicating pipe; two ends of the drain pipe are separatelyconnected to a joint I, a joint II or a joint III; the rubber capsule winds the periphery of the drain pipe between the two joints, and a certain plugging cavity is formed between the rubber capsuleand the drain pipe. A cone-shaped converting body is arranged in the converter; a water through hole and an annular water channel are formed in the cone-shaped converting body and in the surface of the cone-shaped converting body, separately to from a drain channel with a hole I in the converter. The testing device can work under pressures of a same water source in a plugging process and a testingprocess by converting from plugging a high pressure water source to observing a low pressure water source, so that the quantity of the pipeline in the drilled hole is one. The winding problem of a drill pipe and a hose is solved, and the stability of the working process is improved.

Description

technical field [0001] The invention belongs to the technical field of rock mass damage range and permeability measurement, and in particular relates to an in-situ test method for rock mass permeability. Background technique [0002] The permeability of rock mass is an important parameter to reflect the failure characteristics of rock mass. The change of rock mass permeability is closely related to its failure. Exploring its permeability change can further judge the damage range of rock mass. It is very important for further research on rock mass failure mechanism and water inrush mechanism is of great significance. At present, the commonly used methods for detecting the damage range of rock mass include direct current method, transient electromagnetic method, microseismic detection and pressure water test method. Since the direct current method and the transient electromagnetic method are easily affected by the electromagnetic field of the working environment, and the micr...

AI Technical Summary

Problems solved by technology

Since the two external water supply and gas supply consoles are independent of each other, it is bound to cause the correspondingly connected water supply (for observation) and gas supply (for plugging) two pipelines to occur as the test probe advances in the drilling process. The two pipes are entangled with each other, which may cause the device to be blocked or the observation process to be unstable, or the gas supply pipe may be easily broken, causing the equipment to fail to work normally.

How to integrate the plugging and supply operation platform into one, reduce the number of pipelines in the borehole, and at the same time make the plugging process and the observation process work under their respective pressures and maintain the real-time replenishment process, the existing technology fails to solve the above problems at the same time

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