Testing method for consolidation degree of soft soil foundation

A test method and soft soil foundation technology, which is applied in the direction of using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as high requirements for instrument embedding, difficulty in on-site work, and failure of the test system, achieving low failure rate, simple embedding, and The effect of cost reduction

Inactive Publication Date: 2009-09-02
HOHAI UNIV
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Problems solved by technology

The disadvantages of this method are: higher requirements for instrument embedding, sometimes the test system will fail

Method used

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  • Testing method for consolidation degree of soft soil foundation
  • Testing method for consolidation degree of soft soil foundation
  • Testing method for consolidation degree of soft soil foundation

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Experimental program
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Embodiment Construction

[0034] Embodiment adopts steps as follows:

[0035] (1) First, according to the test purpose and task requirements, obtain more detailed engineering data, including geology, soft foundation treatment data, etc.

[0036] (2) Select instruments, including Rayleigh wave detectors, geophones, test cables and seismic sources.

[0037] Before using Rayleigh wave technology to test the degree of consolidation of soft foundation, the depth of the test target layer must be determined first, that is, the calculation depth of the degree of consolidation. The calculated depth is related to the depth of the soft foundation compression layer, and the depth of the soft foundation compression layer is related to the soil layer distribution and the additional stress σ in the soft foundation z Size, soft foundation deformation and other factors are related. The size of the additional stress is related to the size and distribution of the upper load. Therefore, firstly, according to the size a...

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Abstract

The invention discloses a testing method for consolidation degree of soft soil foundation in the field of engineering construction, which comprises the following steps: acquiring a frequency dispersion curve by utilizing the frequency dispersion characteristics when Reyleigh waves are transmitted in a layered medium, and correlationship of the spread velocity of the Reyleigh waves and the physical-mechanical property of a soil body; calculating the wave velocity of the Reyleigh waves of a soft foundation soil layer according to the frequency dispersion curve of the Reyleigh waves; and finally, calculating the consolidation degree by combining a parameter k calculated according to the relation between a normalized shear wave velocity increment of the tested soil layer and the consolidation degree obtained by indoor resonant column tests. Compared with the prior method for calculating the consolidation degree through pore pressure, the testing method is more simple, convenient, effective and economic. The pore pressure is not needed to be tested, so the testing time is greatly saved; moreover, the prior method is easy to fail because of high requirement on the laying of a pore pressure gauge, and the results obtained by the testing method are more accurate.

Description

technical field [0001] The invention belongs to the field of engineering construction, and in particular relates to a method for testing the degree of consolidation of soft soil foundations, especially coastal and riverside silt soil foundations. Background technique [0002] Soft foundation reinforcement is an engineering problem often encountered in coastal areas and other weak areas. When conditions permit, sand well surcharge preloading is an economical and reliable reinforcement method. In the reinforcement process, it is often necessary to understand the change trend of the average consolidation degree of the soft foundation over time, so as to control the construction progress and ensure the safety of the project. [0003] The current method of testing the degree of consolidation is mainly to measure the pore water pressure of the soil by embedding a pore piezometer on site, and obtain the degree of consolidation of the foundation through the relationship between the...

Claims

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Application Information

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IPC IPC(8): G01N29/12G01N29/07
Inventor 洪宝宁周爱国李维刘南征刘鑫祝磊薛伟强方庆军
Owner HOHAI UNIV
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