Test Method Using Horizontal Base Bed Coefficient Test Device

Abstract

The invention discloses a test device for coefficients of a horizontal-reference foundation bed. The test device comprises a test bracket, a lifting jack, a bearing plate, a pressure sensor, a counter-force plate, a hydraulic energy storage tank, a pressure device, a test bridge and a dial indicator, wherein the lifting jack is transversely and horizontally arranged on a horizontal mounting surface of the test bracket; the bearing plate is longitudinally arranged at one end of a cylinder body of the lifting jack and perpendicular to a length direction of the lifting jack; the pressure sensor can be used for displaying pressure; the counter-force plate is longitudinally arranged on one side of the bracket, and a front end surface of the counter-force plate is in contact with the pressure sensor through a cushion block; one end of the hydraulic energy storage tank is communicated with the cylinder body of the lifting jack through an oil path, and the other end of the hydraulic energy storage tank is connected with the pressure device. The invention further discloses a test method for the coefficients of the horizontal-reference foundation bed. A hydraulic energy accumulator and the pressure device are combined with a pressure reducing valve to provide constant-pressure control output, and influences of non-constant load on curve drawing are reduced, so that the test results are guaranteed. Readings can be read conveniently and quickly through the pressure sensor.

Description

technical field [0001] The invention relates to a test device for the coefficient of a base bed, in particular to a test device for a coefficient of a horizontal base bed. The invention also discloses a method for testing the coefficient of a horizontal base bed, which belongs to the technical field of geological engineering. Background technique [0002] In-situ testing refers to the determination of the engineering mechanical properties of rock and soil at the original position of the rock and soil under the conditions of basically maintaining the original structure, natural water content and natural stress state of the rock and soil. The plate load test is to apply loads in stages on a rigid bearing plate of a certain size, and observe the in-situ test of the pressure and deformation of the natural foundation soil under the loads of various levels. Through the test, the foundation force can be determined according to the load-settlement relationship line (curve) The beari...

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Problems solved by technology

[0012] Second, the plate load tester currently used in production is mainly composed of three parts: the load plate, the hydraulic cylinder, and the displacement test dial indicator. It is converted into pressure by formula, so the reading is not direct and inconvenient, which affects the efficiency of test tooling

[0013] Third, the bearing plate and the hydraulic cylinder are separated. When testing the coefficient of the horizontal bed, because the instrument must be placed flat, the bearing plate and the hydraulic cylinder are not easy to fix because they are separated, which increases the difficulty of the test.

[0014] Fourth, according to the definition of the base bed coefficient, Kv=P / S, P is a constant load acting on the bearing plate, the current instrument loading is manually loaded, and the load cannot be kept constant due to displacement after loading, which will affect the final curve. drawn, thereby affecting the test results

[0015] Fifth, since the oil circuit connection pipeline cannot be guaranteed to be completely sealed, the pressure cannot be constant, and leakage may cause errors in test results

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