Liquid-filled soil stress test device and test method

Abstract

The invention relates to a liquid-filled soil stress test device which comprises a capsule-type stress casing body, a protective tube and a transmitting converter. The capsule-type stress casing body is filled with a stress transmission medium which is a liquid medium. The contact surface of the capsule-type stress casing body and the soil body is arc-shaped. Stress transmitted by the transmission medium directly generates a stress signal through the transmitting converter, and the stress signal is output through a signal cable. The transmitting converter is in sealed connection with the capsule-type stress casing body. The protective tube is arranged on the outer side of the transmitting converter. The signal cable is led out through the open ends of the protective tube, and the other end is in sealed connection with the capsule-type stress casing body. The invention further discloses a test method for the liquid-filled soil stress test device. The test device and the test method have the advantages that contact with the soil body is realized in all directions; the stress change of the unit soil body can be fully sensed; the shape of the device can be changed with the deformation of the soil body; the soil body deformation adaptability is high; and the stress change state can be accurately tested.

Description

technical field [0001] The invention relates to the technical field of soil stress testing, in particular to a liquid bladder type confining pressure soil stress meter. The invention can also be used for the stress test caused by self-weight or load in soil bodies such as roadbeds, foundations, and high fillings. Background technique [0002] Soil stress is an important parameter to reflect the working state of roadbed, foundation, high fill and other soils. The distribution of soil stress not only has the significance of theoretical research and practice, but also has the function of guiding engineering research, design, construction, operation and maintenance, etc. [0003] The commonly used test devices in soil stress testing mainly include vibrating wire stress gauges. The vibrating wire stress gauges are mainly composed of a back plate, an induction plate, a vibrating wire, an excitation electromagnetic coil, and a signal transmission cable. They are planar and unidirec...

AI Technical Summary

Problems solved by technology

Therefore, in flexible subgrades, foundations, high fill and other soils, there are still many defects when using vibrating wire stress gauges to test soil stress changes. For example, the confining pressure cannot be tested due to the singleness of the test direction, Shelling due to contact, unable to accurately test stress change state due to inadaptation to large deformation of soil, etc.

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