Device and method for testing soil mass consolidation parameter by sound emission for deep soil mass

Abstract

The invention relates to a device and method for testing a soil mass consolidation parameter by sound emission for a deep soil mass, and belongs to deep soil mass consolidation parameter testing devices. The device comprises a rigid sleeve, a base, a consolidation device consisting of sound emission sensors and a pressure cap, and a data receiving device consisting of a displacement signal receiver and a sound wave signal receiver, wherein the base, gaskets, sealing rings, an upper sound emission sensor, a lower sound emission sensor, the soil sample containing rigid sleeve, a circular permeable stone and a pressure cover plate are arranged sequentially from the bottom to top on the consolidation device; a plurality of clamping grooves are pre-formed in the base, holes are pre-formed in the upper gasket and the lower gasket for placing the sound emission sensors; the circular permeable stone is arranged on the inner wall of the soil sample containing rigid sleeve; the sleeve wall is provided with side draining holes; external sealing rings are arranged at the top, the middle and the bottom of the rigid sleeve respectively; and the data receiving device comprises a displacement receiver and a sound wave emission receiver, which work independently. A function relationship is established according to the displacement change in a one-dimensional consolidation process of the soil mass and synchronous one-dimensional sound emission wave type conduction change, and the device and the method are applied to laboratory tests about the fundamental research of a nondestructive soil testing theory.

Description

technical field [0001] The invention relates to a device and method for testing soil consolidation parameters by acoustic emission in deep soil, which is mainly used for acquisition of parameters in the process of soil consolidation by acoustic emission in geotechnical engineering. The test device can be widely used in tunnels and underground projects , deep soil and other geotechnical engineering in-situ soil testing fields, has a wide range of engineering application value and teaching and scientific research value. Background technique [0002] With the increase of underground excavation depth. To ensure the safety of underground engineering, it is necessary to have a good grasp of the earth pressure properties of deep soil. The underground structure of the deep topsoil layer takes the wellbore as an example, and the ground pressure around the wellbore has undergone construction processes such as consolidation, wellbore excavation, and internal masonry construction. Due...

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Problems solved by technology

[0003] Due to the lag of the existing in-situ soil testing technology, the current research on the soil properties parameters of the deep topsoil layer is limited to the use of remolded soil instead.

However, the actual working state of the remolded soil in the deep topsoil layer is the process of deep topsoil consolidation, soil excavation, soil remodeling and pressurization, etc. Obviously, the remolded soil cannot replace the in-situ soil for testing

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