Cement soil plane strain tester

Abstract

The invention relates to a cement soil plane strain tester; a shell (6) is connected between an upper and a lower covers (5 and 5a) to form a pressure chamber; the upper cover (5) is provided with a sliding top rod (4) connected with a piston rod of a hydraulic cylinder (1); the lower end of the top rod (4) is connected with a loading plate (7); a sample side pressure plate (10) is arranged between the upper loading plate (7) and a lower loading plate (7a); the cement soil plane strain tester is characterized in that a. the pressure chamber is internally provided with a counter-force frame (23); b. one end of the counter-force frame is provided with an adjusting screw rod (22) which is contacted with the sample side pressure plate (10); c. the upper and the lower loading plates are respectively provided with drain pipes (8 and 18) which are connected with flow meters (11 and 26); and d. the piston rod is provided with sensors (2 and 3), and the counter-force frame is internally provided with a sensor (14). The cement soil plane strain tester has the advantages that the mechanics characteristics of cement soil plane strain can be tested in a room, the problems of regulation and control of principal stress and accuracy thereof can be solved by using the adjusting screw rod to adjust the contact between the pressure plate along the direction of the principal stress and a sample, and the problem of contact between the sample and the pressure plate after consolidation and deformation of the principal stress can be also solved.

Description

technical field [0001] The invention relates to a cement-soil mechanics test device, which is mainly used for testing the mechanical properties of cement-soil plane strain. Background technique [0002] In recent years, cement-soil walls formed by cement-soil mixing piles have been widely used in seepage interception projects such as foundation pit water-stop curtains, dams, and gate foundations. Since the cement-soil cut-off wall is in a plane strain state in the principal stress space, that is, ε 2 →0. Therefore, the study of the mathematical relationship between the stress and strain of the cement-soil cut-off wall requires the use of a plane strain test device. At present, the deformation control methods of plane strain instruments can be mainly divided into two categories, one is active, by applying σ 2 Directional stress controls its non-deformation, the plane strain gauge of this method is in ε 2 Direction has instantaneous deformation effect; the other type is pa...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defect that the existing soil or rock plane strain gauges have small damage load and low precision, improve the problem that the plane strain gauge is laterally restrained and in contact with the sample, and provide a cement Plane Strain Apparatus for Soil Testing

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