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In-situ determination method for tensile strength and uniaxial compressive strength of rock

A uniaxial compressive strength and tensile strength technology, applied in the direction of strength characteristics, using stable tension/pressure test material strength, measuring device, etc., to achieve the effect of high accuracy, cost saving and simple calculation process

Pending Publication Date: 2022-05-20
XIAN UNIV OF TECH
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Problems solved by technology

However, the relationship between rock tensile strength and drilling parameters has rarely been studied, and the explicit relationship between uniaxial compressive strength and drilling data has so far been mainly empirical.

Method used

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  • In-situ determination method for tensile strength and uniaxial compressive strength of rock
  • In-situ determination method for tensile strength and uniaxial compressive strength of rock
  • In-situ determination method for tensile strength and uniaxial compressive strength of rock

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Embodiment

[0050] The uniaxial compressive strength, tensile strength and internal friction angle of sandstone, marble, shale and diorite were obtained through laboratory tests.

[0051] This embodiment provides a method for in-situ determination of rock tensile strength and uniaxial compressive strength, which is specifically implemented according to the following steps:

[0052] Step 1. Based on the force characteristics of the drill bit and according to the principle of mechanical limit equilibrium, a mechanical analysis model of the drill bit drilling process is established;

[0053] Such as figure 1 As shown, the drilling process of the rock on the helical surface is divided into the cutting stage and the friction stage. In the cutting stage, the torque force perpendicular to the axial movement only cuts the rock; in the friction stage, the indentation changes with the axial advancement of the drill bit, including Dented, crushed and crushed. In these two phases, thrust and torque...

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Abstract

The invention discloses an in-situ determination method for tensile strength and uniaxial compressive strength of rock, which is based on the working principle of the process of drilling the rock by a diamond bit, and directly establishes a relation between the uniaxial compressive strength and tensile strength and drilling parameters through rock mechanical parameters by combining with an analysis model. The method for estimating the rock strength parameter is provided by analyzing and researching the relationship among the internal friction angle, the cutting strength ratio, the uniaxial compressive strength and the tensile strength of the rock. The method solves the problems of difficulty in sample preparation, complex steps, large error and the like in the existing rock mechanical strength parameter test, is simple in calculation process, still has high calculation precision under the condition that an experience correction coefficient is not adopted, and can be directly applied to rock strength prediction.

Description

technical field [0001] The invention belongs to the technical field of underground space and tunnel engineering, and relates to an in-situ measuring method for rock tensile strength and uniaxial compressive strength. Background technique [0002] Accurate measurement of rock uniaxial compressive strength and tensile strength is the premise to ensure the safety and stability of engineering rock mass. Accurate evaluation of rock mass strength characteristics has important practical significance in engineering design and construction. Since the beginning of the 21st century, with the country's increasing emphasis on the field of infrastructure engineering, the issue of engineering stability has become particularly important at this time. As the compressive strength that affects the stability of rock mass engineering, it has been used for rock mass quality evaluation and classification for a long time. The compressive strength value can usually be obtained by uniaxial compressiv...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/08
CPCG01N3/02G01N3/08
Inventor 何明明周佳佩李盼峰张永浩朱记伟王晶张志强马旭东邓边员刘洁白雪任桃平
Owner XIAN UNIV OF TECH
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