Rock filling fracture permeability test method and device that can consider the influence of multiple factors
A testing method and technology of permeability, which is applied in the field of rock filling fracture permeability testing method and device, and achieves the effects of simple operation, high precision and low cost
Active Publication Date: 2017-12-26
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0006] The purpose of the present invention is to provide a method and device for testing the permeability of rock filling fractures that can consider the influence of multiple factors, so as to solve the problem that domestic and foreign scholars only consider a single flat, smooth and non-filling when studying the hydraulic properties of fractured rock mass. Test the permeability of the fracture, and then make appropriate corrections to obtain the fracture permeability according to the connectivity, roughness, filling and stress state of the fracture
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[0024] The test method of rock filling fracture permeability is tested by using MTS testing machine and fracture normal compression loading device, including: fracture opening, roughness, filling particle size composition, and compactness. The rock filling fracture permeability is affected by multiple factors.
[0025] Specific steps are as follows:
[0026] (1) Prepare a standard rock or similar material sample containing a single prefabricated axially penetrating fracture, and the trace length (can penetrate), crack occurrence, opening and roughness of the crack on the cross section of the sample can be adjusted; The similar material is cement mortar or resin;
[0027] (2) Prepare filling materials with specific particle size components, and fill the cracks according to a certain degree of compactness; the filling materials are sand or silt; the maximum particle size d of the specific particle size max ≤1.0mm; the certain compactness mentioned is the relative compactness D ...
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Abstract
A rock filled fracture permeability test method considering multi-factor affect belongs to the rock filled fracture permeability test method and apparatus. The method is as below: preparing a of standard sample containing prefabricated axially-through filled fractures, wherein the geometry parameters and filling cementation features of the fracture can be adjusted. The apparatus includes a fracture normal constraint board, a rigid connecting rod and a nut. A tape and a heat shrink tubing are used to seal the an upper pressure head, a filling cracks and a porous disc and the samples containing filled fractures; the upper pressure head is provided with a side outlet; the sealed sample is entirely placed into a fracture normal compression loading device, a torque wrench is used for loading and fixing, and the torque value is changed to adjust the compactness of the filler; and a fracture seepage test is conducted on a test machine, the piston speed is selected, the amount of water outlet is recorded, and a steady-state method equation is used to calculate the permeability. The apparatus has the characteristics of simple structure, easy operation, low cost and high accuracy, and has broad application prospects in the research of rock filled fracture seepage test.
Description
technical field [0001] The invention relates to a method and device for testing the permeability of rock-filled fissures, in particular to a method and device for testing the permeability of rock-filled fissures, which can consider the influence of multiple factors. Background technique [0002] Rock is the basic material that makes up the crustal structure. It is a product of nature that has experienced a long geological history. There are many micro-cracks, joints, faults and other structural defects in natural rocks. The occurrence forms of rock mass fissures are changeable, and the filling cementation and geometric features are complex, which makes the seepage properties of rock mass different from granular porous media such as soil, and has its complexity and particularity. Structural planes are good passages for groundwater infiltration and inrush in rock masses, which can lead to instability and destruction of engineering surrounding rocks in severe cases. Therefore, ...
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IPC IPC(8): G01N15/08
CPCG01N15/082
Inventor 蔚立元李光雷朱谭谭靖洪文苏海健杨圣奇
Owner CHINA UNIV OF MINING & TECH