Fracturing type rock tensile strength test apparatus and method

Abstract

The invention discloses a fracturing type rock tensile strength test apparatus and method. A test object is a cylindrical soil or soft rock test sample. The fracturing type rock tensile strength testapparatus comprises a mechanical structure and a control apparatus; the test sample is installed between a passive fracturing rod and an initiative fracturing rod which are vertically arranged, and the test sample is centered by virtue of an adjusting centering frame and fit to the passive fracturing rod; the initiative fracturing rod is propelled along a horizontal direction so as to fracture thetest sample; the propelling rate of the initiative fracturing rod is controlled by a rate controller of the control apparatus; a data acquisition module acquires and stores the pressure and displacement data and display the data on a display screen in a graphic manner in real time; and after the test is ended, a data analysis module calculates a tensile strength value. The fracturing type rock tensile strength test apparatus is light and compact in structure; the test needs no additional component, and the system error is small; the test sample is convenient to install, the operation is simple, and the test efficiency is high; and the test sample is vertically arranged and is firm without slippage, the test sample position is stipulated by adopting the centering frame, the generation of deviatoric stress is avoided, the uniformity of the test sample destruction effect is ensured, and the test result is accurate and reliable.

Description

technical field [0001] The invention specifically relates to a fracturing type rock and soil tensile strength testing device and method, belonging to the field of rock and soil mechanical strength testing devices. Background technique [0002] Tensile strength refers to the ultimate resistance of materials to tensile stress generated by external loads. At present, the methods for testing the tensile strength of rock and soil mainly include uniaxial tension method, Brazilian split method and axial fracturing method. [0003] The uniaxial tension method is to apply tension directly at both ends of the sample until the sample is broken. The tensile strength is calculated from the stress and area of ​​the section at fracture. The uniaxial tensile method can observe the complete process of the sample from being stretched to failure during the test, and can intuitively reflect the mechanical behavior of the sample under tension. However, for soil and soft rock materials, there ...

AI Technical Summary

Problems solved by technology

In actual operation, it is difficult to accurately align the upper and lower cylindrical liners, resulting in eccentric compression of the specimen

In addition, the fracturing effect of the test is difficult to unify, and the samples after fracturing damage usually do not have the conical fracture surface and multiple independent cracks along the radial direction required by the code, which affects the test results

[0006] In addition to the above problems, in the current tensile strength test method, the test load is generally provided by the universal testing machine, which requires many parts, and related parts, such as fixtures, pads, liners, etc., require additional processing and customization. The entire test system is expensive, bulky, and inconvenient to move

At the same time, the test process requires the cooperation of multiple people, the operation is complicated and cumbersome, and the efficiency is low

There are many manual steps in the test, and the installation or placement of parts is difficult to achieve precise control, which affects the final test effect

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