Novel high-pressure large-expansion quantity pressure gauge detector with slidable end part

Abstract

A novel high-pressure large-expansion quantity pressure gauge detector with a slidable end part comprises a central shaft, a die rubber outer film sleeve, a die rubber inner film sleeve, elastic protection steel sheets, slidable fixing members, a water-air pipeline and a fast joint. The die rubber inner film sleeve is sleeved on the central shaft and two ends of the die rubber inner film sleeve are compressed and sealed to form a water cavity together with the central shaft; the die rubber router film sleeve is sleeved on the central shaft and is positioned at the outer layer of the die rubber inner film sleeve; two ends of the die rubber outer film sleeve are sealed by the slidable fixing members; the central shaft, the die rubber outer film sleeve and the slidable fixing members form an air cavity. The air pipes and water pipes in the water-air pipeline and the fast joint are respectively communicated with the air cavity and the water cavity. The elastic protection steel sheets are uniformly arrayed and arranged on the die rubber outer film sleeve in a laminating mode. The elastic protection steel sheets are fixed by telescopic hoops. The novel high-pressure large-expansion quantity pressure gauge detector with the slidable end part can be used for measuring the limitation pressure, can ensure that the successful rate of the experiment to be above 90%, can be widely applied to the in-situ testing of various rock and earth masses, and has well promotion and application prospects.

Description

technical field [0001] The invention relates to the technical field of testing instruments for rock and soil materials, in particular to a new type of end-sliding type high-pressure and large-side-expansion lateral-pressure instrument probe. Background technique [0002] Side pressure test is one of the commonly used in-situ test methods in geotechnical engineering, and is widely used in the investigation and experimental research of rock and soil mass. The equipment for side pressure test is composed of air pressure source, main engine control system, side pressure probe and connecting pipeline, etc. Its working principle is: firstly drill the formation to the test depth, and then use a drill bit suitable for the size of side pressure probe to drill Take the side pressure test hole (generally about 1m); install the side pressure probe in the test hole, inject water and air into the cylindrical side pressure probe through the host control system and the connecting pipeline, ...

AI Technical Summary

Problems solved by technology

[0007] (1) The hole diameter of the side pressure test hole formed by drilling is too large, resulting in a large volume change corresponding to the contact pressure, and the plastic pressure and ultimate pressure of the sand and gravel covering layer are high, which makes it impossible to measure the plastic pressure and limit pressure;

[0008] (2) The hole wall of the side pressure test hole formed by drilling is not smooth, and there are many stone edges and corners. During the test, the rubber film on the side pressure probe will be punctured, resulting in test failure

[0009] The existing side pressure probe adopts the structural type that both sides are completely fixed, and the middle part is composed of an elastic rubber membrane sleeve. The transition part between the end and the middle pressure chamber will bulge and rupture due to excessive local tensile strain, resulting in the suspension of the test

[0010] To sum up, when carrying out lateral pressure tests in coarse-grained rock and soil, the current lateral pressure probes cannot meet the requirements of high pressure and large lateral expansion, and cannot measure the plastic pressure and ultimate pressure, and can only rely on contact The pressure and the maximum pressure applied to estimate the side pressure modulus; and the phenomenon that the rubber mold sleeve is punctured frequently occurs, resulting in a low test success rate

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