Direct-shear measuring method of drilling rock mass specimen preparation

A technology of sample preparation and testing method, which is applied in the field of scientific experiments, can solve the problems of high test cost, long test period, dependence on masons, etc., and achieve the effect of convenient operation, simple method and low cost

Active Publication Date: 2011-01-19
YELLOW RIVER ENG CONSULTING +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0016] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a direct shear test method for drilling rock mass sa

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  • Direct-shear measuring method of drilling rock mass specimen preparation
  • Direct-shear measuring method of drilling rock mass specimen preparation
  • Direct-shear measuring method of drilling rock mass specimen preparation

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Embodiment Construction

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Depend on figure 1 , figure 2 As shown in the figure, a 2m×2m test flat hole 15 is first excavated in the mountain 23 by conventional blasting method, and then two holes are drilled downward with a large-diameter drilling rig on the test flat hole bottom plate 20, one hole is the shear hole 1, The other hole is the specimen hole 2. The centers of the two holes are on a straight line. The direction of the straight line is consistent with the direction of the engineering force. The distance between the adjacent hole walls of the two holes is 5-10 cm. In the hole, as sample 3, the core is taken out of the shear hole to install the shear test equipment, and then the rock mass in the middle of the two holes is cut and connected. The diameter of the specimen hole is 70cm, the diameter of the core, that is, the test sample, is 60cm, and t...

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Abstract

The invention relates to a direct-shear measuring method of drilling rock mass specimen preparation, which can solve the problems of high test expenses, long test period and low efficiency effectively and particularly can overcome the defect that specimen preparation is dependent on stonecutters. The method comprises the following steps of: excavating a test adit in a mountain by adopting a bursting method first, and drilling two holes upwards on a test adit bottom board by using a drilling machine, wherein one hole is a shear hole, the other hole is a specimen hole, the centers of the two holes are in the same straight line, the direction of the straight line is consistent with that of engineering stress, and the specimen hole is a test sample drill hole; reserving a rock core in the holes, taking the rock core from the shear hole for arranging a shearing test equipment, and cutting the rock mass on the middle part of the two holes for communicating; determining the drilling depth according to the position of a shear surface, and after completing a drilling workpiece, arranging a steel protective sleeve on a specimen; and arranging normal and shearing loading equipment respectively after the work is finished. The direct-shear measuring method has the advantages of simplicity, convenient operation, low cost, labor and time saving and high efficiency, and is the innovation of the direct-shear test of the site rock mass strength.

Description

1. Technical field [0001] The invention relates to scientific experiments, in particular to a direct shear test method for preparing drilled rock mass samples. 2. Background technology [0002] In the design and construction of geotechnical engineering, it is generally necessary to measure the shear strength of the rock mass or its structural surface. According to the relationship between the shear stress τ and the normal stress σ, the shear strength parameters of the rock mass are calculated and determined according to the Coulomb expression. Friction coefficient f and cohesion C. The drilling type rock mass sample preparation and direct shear test system is designed with reference to the rock mass strength direct shear test in the "Water Conservancy and Hydropower Engineering Rock Test Regulations" (SL264-2001), and the test methods, boundary conditions and calculation formulas meet the requirements. . The calculation of normal stress σ and shear stress τ under each norm...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B49/02E21B25/00
Inventor 袁兆华李运奎房敬年杨汉杰杜建中谢瑛
Owner YELLOW RIVER ENG CONSULTING
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