Two-stage loading consolidation testing method of normal consolidated undisturbed foundation soil

A technology for consolidation test and foundation soil, which is applied in the direction of applying stable tension/pressure to test the strength of materials, which can solve the problems of long time, low efficiency and large workload, saving time, improving test efficiency and reducing work. amount of effect

Inactive Publication Date: 2016-11-09
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0006] This test method has the following disadvantages in the actual indoor geotechnical test operation process: each soil sample has a large number of loading stages, and when there are many lay

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  • Two-stage loading consolidation testing method of normal consolidated undisturbed foundation soil
  • Two-stage loading consolidation testing method of normal consolidated undisturbed foundation soil
  • Two-stage loading consolidation testing method of normal consolidated undisturbed foundation soil

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Embodiment Construction

[0024] A kind of embodiment of the present invention is, a kind of two-stage loading consolidation test method of normal consolidation undisturbed foundation soil, its steps are as follows:

[0025] A two-stage loading consolidation test method for normally consolidated undisturbed foundation soil, the steps of which are as follows:

[0026] a. Prepare a sample of normally consolidated undisturbed foundation soil, and measure its initial void ratio e 0 , and put the sample into the consolidation container;

[0027] b. Apply a pre-pressure of 1kPa first, so that the contact between the sample and each part of the loading instrument is good, and the dial indicator or displacement sensor is adjusted to zero;

[0028] c. Apply the first level load p to the sample 1 And keep it for 24 hours, record the deformation of the sample at the end of the first stage of loading, and obtain the void ratio e of the sample at the end of the first stage of loading 1 ; Then apply the second le...

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Abstract

The invention provides a two-stage loading consolidation testing method of normal consolidated undisturbed foundation soil. The method comprises the following steps: preparing and arranging a soil sample, determining an initial void ratio e0; applying 1 kPa of pro-load pressure for better contacting the sample and a device; performing two-stage loading with load of p1 and p2 in a loading test, determining the load values of p1 and p2 according to soil burial depth, respectively recording the deformation amount of the sample under two stage loading, conversing the deformation amount to the void ratio e1 and e2, obtaining a Harris function parameter A shown in a specification, a function parameter N shown in the specification, and a function parameter B shown in the specification, finally obtaining a relation which is shown in the specification between the soil void ratio e and overburden pressure p, wherein, the parameters are shown in the specification, and performing the loading consolidation tests of the normal consolidated undisturbed foundation soil. The method greatly reduce the loading stages of the consolidating tests, test time is shortened, test efficiency is increased, and the test result precision can satisfy the engineering practice requirement.

Description

technical field [0001] The invention relates to a soil engineering test method, in particular to a consolidation test method aimed at normally consolidated undisturbed foundation soil. Background technique [0002] Normally consolidated soil is soil that is completely consolidated under the existing self-weight pressure, that is, the existing self-weight pressure is equal to the previous consolidation pressure. In engineering design, foundation soil is generally considered to be normal consolidated soil. The undisturbed foundation soil sample can be obtained by cutting the foundation soil, and then the consolidation test of the normal consolidated undisturbed foundation soil can be carried out. Through the consolidation test, the relationship curve between the soil void ratio and the overlying pressure can be obtained, and then a series of foundation settlement calculation indicators such as the compression modulus, compression index and pre-consolidation pressure can be de...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 罗强赵明志魏明朱江江张良蒋良潍田地陆清元张玉广司光武
Owner SOUTHWEST JIAOTONG UNIV
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