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Vacuum preloading method effectiveness real-time detection method and device

A vacuum preloading method and real-time detection technology, which is applied in construction, foundation structure testing, foundation structure engineering, etc., can solve problems such as lack of better reinforcement effects of different soil foundations, achieve optimal design and construction parameters, and high reliability , the effect of convenient operation

Active Publication Date: 2016-06-08
WENZHOU UNIV OUJIANG COLLEGE +1
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Problems solved by technology

So far, domestic laboratories mainly use the cross plate shear method to evaluate the reinforcement effect, which must be judged after the reinforcement is completed, and there is no good method to measure the reinforcement process and reinforcement effect for different soil foundations, so it is necessary Propose a non-destructive, reliable and easy-to-operate detection device to evaluate the effect of vacuum preloading method before design and construction

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  • Vacuum preloading method effectiveness real-time detection method and device

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Embodiment Construction

[0025] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings: a real-time detection method for the effectiveness of vacuum preloading method, the steps are as follows:

[0026] (1) Measure the compression wave velocity V of the soil at different times and at different depths by piezoelectric sensors p and shear wave velocity V s ;

[0027] (2) Take the soil after normal consolidation as the comparison group, and measure its compression wave velocity V by piezoelectric sensor np and shear wave velocity V ns ;

[0028] (3) Calculate the reinforcement factor α=V s / V ns ;

[0029] (4) Calculate Poisson's ratio υ=E / 2G-1, where E is the elastic modulus, G is the shear modulus, E=V p 2 ρ,G=V s 2 ρ, υ=E / 2G-1=V p 2 / 2V s 2 -1;

[0030] (5) Finally calculate α respectively 1 , α 2 , α 3 and υ 1 , υ 2 , υ 3 (α 1 , α 2 , α 3 and υ 1 , υ 2 , υ 3 are the reinforcement coefficient and Poisson's ratio...

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Abstract

The invention provides a vacuum preloading method effectiveness real-time detection method and device. By means of piezoelectric sensors, compression wave speeds and shear wave speeds of a soil body at different times are measured; a normally-solidified soil body serves as a comparison group, and the compression wave speed and the shear wave speed of the normally-solidified soil body are measured through the piezoelectric sensors; then according to related formulas, the shear modulus, the compression modulus and the Poisson's ratio are obtained. By means of the detection method and device, real-time evolution of relevant parameters of the soil body along with load application can be further obtained, and accordingly effectiveness of a vacuum preloading consolidation method in different soil bodies and in different depths is judged. By means of the detection method, effectiveness of the vacuum preloading method can be accurately evaluated in a lossless mode, design and construction parameters are optimized according to different soil mass properties, operation is convenient, and reliability is high.

Description

technical field [0001] The invention relates to a real-time detection method and device for the effectiveness of a vacuum preloading method. Background technique [0002] The vacuum preloading foundation treatment method is widely used in the improvement of the physical and mechanical parameters of weak soil foundations, especially in the large-scale land reclamation projects in recent years. However, the vacuum preloading foundation treatment method has different reinforcement effects for different soil types. It directly affects the selection of design parameters and the optimization of construction technology. However, the three parameters of maximum shear modulus, compression modulus and earth pressure are the three most basic parameters of soil mechanics. A very important basic parameter in terms of design. So far, domestic laboratories mainly use the cross plate shear method to evaluate the reinforcement effect, which must be judged after the reinforcement is complete...

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Application Information

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IPC IPC(8): E02D33/00E02D3/10
CPCE02D3/10E02D33/00
Inventor 李博郑华杜运国王朝亮周剑毅
Owner WENZHOU UNIV OUJIANG COLLEGE
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