Cement soil uniaxial tensile tester and test method

Abstract

The invention relates to a cement soil uniaxial tensile tester and test method, and belongs to the field of cement soil sample test equipment. A dynamic loading system, a measuring system and a sample positioning and stretching system are arranged on a test main body platform of the tester; the sample positioning and stretching system is used for placing a detected cement soil sample; and the dynamic loading system drives the sample positioning and stretching system, and the measuring system is used for collecting tension and displacement change data of the sample positioning and stretching system. According to the cement soil uniaxial tensile tester, the loading mode is a strain control mode; and compared with a traditional uniaxial tensile test device, the tester can measure the complete cement soil tensile stress-strain relation curve, and analyzes the influence of the loading rate on the cement soil tensile property, so comparison is performed to select the loading rate with the minimum influence on the tensile strength test of the cement soil sample.

Description

technical field [0001] The invention relates to a cement-soil uniaxial tensile tester and a test method, belonging to the field of cement-soil sample test equipment. Background technique [0002] The tensile strength of cement-soil is generally not used in engineering construction, but under some specific working conditions, it is not uncommon for the cement-soil structure to crack and fail. For example, the cement-soil structure around tall buildings such as high-voltage transmission line towers often cracks due to insufficient tensile strength. Cement-soil mixing piles often have tensile stress in part of the structure due to eccentric compression. When the pile body is deformed due to large bending deformation, it will cause Problems such as cracking and damage. In recent years, many geological and geotechnical experts and scholars at home and abroad have paid attention to improving the tensile properties of cement-soil and how to accurately measure the tensile strength ...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the cumbersome operation in the prior art and the cross-section position of the sample is not easy to control; the sample is difficult to fix during the tensile test, and eccentric loads are easily formed; the test piece is easily damaged or broken at the restraint of the chuck; Sudden changes in the cross-section of the specimen are likely to cause large stress concentration damage at the variable cross-section, which reduces the reliability of the test results; the stress-controlled loading method cannot measure the complete tensile stress-strain curve of the cement-soil sample, and the loading process is easy. Affected by human factors, the accuracy of the test results cannot be guaranteed, etc., and the cement-soil uniaxial tensile tester and test method are provided

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