Single-cavity high-pressure pre-drilling shear lateral pressure gauge

Abstract

The invention belongs to the technical field of geological survey, and discloses a single-cavity high-pressure pre-drilling shear lateral pressure gauge. The single-cavity high-pressure pre-drilling shear lateral pressure gauge comprises a jacking device, a lateral pressure gauge probe, a control system and a pipeline system, wherein the lateral pressure gauge probe comprises a core rod, a neck bush and a rubber film; the upper end of the core rod is sequentially provided with a first shaft shoulder and a second shaft shoulder; the lower end of the core rod is provided with an annular pressing cap; the neck bush is sleeved at the outer side of the core rod between the second shaft shoulder and an annular pressing sleeve; pressing rings for pressing the rubber film are arranged at the two ends of the neck bush; a fixing screw nut is arranged at the lower side of the annular pressing cap; the periphery of the core rod is sleeved with a double-layer metal armor; the upper end of the double-layer metal armor is fixedly connected with the first shaft shoulder; the lower end of the double-layer metal armor is attached to the fixing screw nut; the pipeline system comprises a liquid inlet pipeline; the liquid inlet pipeline communicates with a gap between the neck bush and the core rod; and a liquid inlet through hole is formed in the middle part of the neck bush. After high pressure is applied a measuring cavity, the two ends of the rubber film can be prevented from extending outwards in the axial direction, and the rubber film can be prevented from being pierced or cut by rocks in a hard soil layer.

Description

Technical field[0001]The present invention relates to the field of geological surveys, and more particularly to a single cavity high pressure pre-diamond shear bypassometer.Background technique[0002]The bypassure test is one of the in-situ test methods widely used in geotechnical engineering, and frequently used in deep formation surveys. The basic principle is to use the drill rod to form a drilled hole in the test formation, put a cylindrical bypack in the borehole design, and pressurize cause the bypass to expand laterally, depending on the test of the test, the drilling is lateral expansion. Volume-pressure or stress-strain relational curve, according to this, it can be used to estimate the infographic force, measure the strength parameters, deformation parameters, batch bed coefficients, estimation base settlement, and settlement.[0003]In the late 1970s, my country has begun to develop bypass equipment. In the 1980s, China has gradually begun the practice, promotion and enginee...

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Problems solved by technology

[0005] The present invention intends to provide a single-cavity high-pressure pre-drilling shear side pressure instrument to solve the problem that the rubber mold of the existing side pressure instrument probe is prone to detachment

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