Method and device for testing static lateral pressure coefficient in soil body water saturation-drainage cycle

Abstract

The invention aims at providing a method for simulating a soil body water saturation-drainage cycle process and researching a static lateral pressure coefficient under the action of the soil body water saturation-drainage cycle, namely, a method for testing the static lateral pressure coefficient in the soil body water saturation-drainage cycle. The method comprises the following steps of: 1) preparing a test sample required for testing the static lateral pressure coefficient; 2) saturating the test sample in the step 1); 3) draining; 4) saturating water; 5) repeating the steps 3) and 4) for a plurality of times; and 6) testing the static lateral pressure coefficient. The device for realizing the method mainly comprises an axial loading system, a soil pressure sensing system, a water pressure sensing system and a pressure chamber. During test, the test sample is arranged on a pot clay panel and an annular porous stone, a test sample loading plate is arranged on the test sample, and a force transmission device of the axial loading system penetrates through a top cover and is contacted with the test sample loading plate.

Description

technical field [0001] The invention relates to the test of the basic mechanical properties of the soil, in particular to a method of simulating the soil which has undergone a saturation-drain cycle under laboratory conditions, and testing the static lateral pressure coefficient of the soil. Background technique [0002] The static lateral pressure coefficient of soil is a key parameter for calculating static earth pressure and studying the interaction between soil and structure, which refers to the lateral effective stress and vertical effective stress Ratio. The static lateral pressure coefficient can reflect the horizontal stress caused by the foundation soil under its own weight and upper load, and can be used to calculate the static earth pressure and distribution of the soil acting on the retaining structure and evaluate the stability of the retaining structure It has been widely used in the design and calculation of various retaining structures in water conservancy e...

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Problems solved by technology

[0004] To study the change characteristics of the static lateral pressure coefficient of the soil under the saturated-drain cycle condition under laboratory conditions, it is necessary to simulate the saturated-drain cycle condition experienced by the reservoir bank and the barrage dam soil as realistically as possible. But in order to save the test time, the test duration can not be very long

The traditional test method and its system is that the soil is consolidated in a saturated state, and it is impossible to perform saturation-drainage cycle on the sample, so it cannot be used to study the influence of saturation-drainage cycle on the static side pressure coefficient

In addition, in the traditional test, it is necessary to saturate the sample in the ring knife first, and then push the saturated sample from the ring knife into the container of the lateral pressure instrument. This operation method greatly disturbs the soil sample

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