Method for testing soil mass fragmentation parameters and tester thereof

A tester and parameter technology, applied in the direction of testing material hardness, etc., can solve the problems of difficult installation of displacement extensometers, difficult to ensure critical load accuracy, difficult to obtain test curves, etc. high effect

Inactive Publication Date: 2008-02-20
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When testing the fracture parameters of materials with poor fracture resistance such as soil in the prior art, the sample may undergo fracture damage caused by the self-weight of the sample before loading. In addition, the prior art uses displacement extensometers to measure the opening displacement of the crack mouth, which makes the quality of the sample crack incision and the installation quality of the extensometer have a greater impact on the test results, and the soil sample In terms of displacement extensometer, it is difficult to install; moreover, it is difficult to obtain the test curve after the peak load when using the existing method to test the soil sample; It is difficult to guarantee the accuracy of the method to determine the critical load for crack initiation

Method used

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  • Method for testing soil mass fragmentation parameters and tester thereof
  • Method for testing soil mass fragmentation parameters and tester thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1、2、3

[0021] The effective length S of the sample is 18.50cm, the width W of the sample is 4.40, 4.60, and 4.80cm, the thickness B of the sample is 2.20, 2.30, and 2.40cm, and the crack depth a is 2.00, 2.25, and 2.50cm.

[0022] The loading direction is horizontal, the load is measured by a small-range high-precision load cell, the displacement of the loading rod is measured by a dial indicator, the conductance of the sample is measured by a conductivity meter, and the critical load is represented by a load-displacement curve or a conductance incremental displacement curve.

[0023] For the case of simple loading, the load during the test, the displacement of the loading rod, and the measured value of the conductance of the sample are shown in Attached Table 1, and the conductance increment in the table is calculated from the conductance. The critical load can be obtained from the load-displacement curve or the conductance incremental displacement curve. Draw the load-displacement ...

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Abstract

The invention relates to a testing machine and method for testing earth splitting parameter, which comprises horizontal charging direction, load measured by a minimum, high accuracy force sensor, load bar transposition measured by dial indicator, sample conductivity measured by conductivity meter, limit load ascertained by load transposition curve and transducer increment transposition curve. The testing machine comprises power making handle, variable- speed case, dowel bar, force sensor, load bar, dial indicator, conductivity meter, all-around supporting roller and samples.

Description

technical field [0001] The invention relates to a method for testing fracture parameters of low-strength materials and a testing instrument thereof, belonging to the technical field of soil fracture parameter testing instruments. Background technique [0002] Commonly used in the prior art is the standard three-point bending fracture test method. The standard three-point bending test is a standard method for testing the fracture parameters of metal and concrete, and the loading direction in the test is consistent with the self-weight direction of the sample. When testing the fracture parameters of materials with poor fracture resistance such as soil in the prior art, the sample may undergo fracture damage caused by the self-weight of the sample before loading. In addition, the prior art uses displacement extensometers to measure the opening displacement of the crack mouth, which makes the quality of the sample crack incision and the installation quality of the extensometer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/40
Inventor 朱俊高王俊杰陈亮
Owner HOHAI UNIV
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