Lateral deforming controller

Abstract

The invention discloses a lateral deforming controller which comprises an oil cylinder, wherein a piston capable of moving back and forth is arranged in the oil cylinder; a piston rod of the oil cylinder is also connected with a piston rod of a liquid injecting cylinder; the head part of the liquid injecting cylinder is connected with a multipass joint; and the multipass joint is also connected with a first pressure gage, a water supply pipe and a connecting pipe. The piston in the oil cylinder can be driven to do bidirectional movement by the switch of a reversal valve of a hydraulic system, thereby driving the piston rod of the liquid injecting cylinder to move. An initial pressure value is preset in the liquid injecting cylinder, the bidirectional movement of the piston rod can cause the change of water pressure, and the change is transferred in a sealed chamber of a static lateral pressure instrument by the connecting pipe to be capable of controlling the shrinking and the expansion of a rubber ring in the sealed chamber. The rubber ring is expanded by suction force so as to prevent lateral wall friction when the lateral deforming controller is installed in a soil body; after the thrust is applied to the rubber ring, the rubber ring is shrunk and tightly attached to the lateral surface of the soil body and exhausts air. The invention carries out a plurality of tests on soil layers in different areas, leads a K0 value to be more real and overcomes the defect that a relation curve of axial valid stress and lateral valid stress does not pass through a coordinate origin.

Description

technical field [0001] The invention relates to a device for lateral deformation control of geotechnical test data acquisition, in particular to a lateral deformation controller of a static lateral pressure gauge. Background technique [0002] The static side pressure coefficient K of the soil 0 is the ratio of the lateral effective stress to the axial effective stress of the soil without lateral deformation. K 0 The coefficient is one of the indispensable parameters for earth pressure calculation. Currently K 0 The coefficients are obtained through experiments using a static side pressure gauge. The rubber ring in the static side pressure gauge is used to control the lateral effective pressure of the undisturbed soil sample. Since the diameter of the original sample is the same as that of the rubber ring, the side of the soil body and the side wall of the rubber ring are prone to friction when the soil sample is installed, and there is air due to the concave gap betwee...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a lateral deformation controller, which can eliminate the friction between the rubber ring and the soil sample when the static side pressure gauge is installed on the soil sample, and the friction between the rubber ring and the soil sample when measuring the lateral stress. There is a gap defect that makes K 0 The data is more objective and real

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