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Method for rapidly measuring natural foundation rigidity coefficient

A technology of stiffness coefficient and natural foundation, applied in seismology, measuring devices, geophysical measurement, etc., can solve the problems of equipment installation, complicated test process, heavy vibration equipment, high test cost, etc., and achieve short test period and low test cost. Low, the effect of simplifying the test process

Inactive Publication Date: 2018-08-28
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of bulky vibration equipment, long test period, complicated equipment installation and test process, and high test cost in the current test method for the stiffness coefficient of natural foundation.

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  • Method for rapidly measuring natural foundation rigidity coefficient
  • Method for rapidly measuring natural foundation rigidity coefficient
  • Method for rapidly measuring natural foundation rigidity coefficient

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Embodiment Construction

[0036] In practice, the following steps can be followed:

[0037] 1. Earthquake arrangement is as follows: figure 1 Shown:

[0038] The design parameters are: track spacing: L=0.5m;

[0039] Offset: L0 1 =L0' 1 =0m L0 2 =L0' 2 =5m L0 3 =L0' 3 =10m L0 4 =L0' 4 =15m

[0040] Sampling interval: Δ=500μs;

[0041] Vibration method: hammering the source;

[0042] Geophone: 4H z Geophone

[0043] Instrument: 12 engineering seismographs.

[0044] 2. Determine the depth of the target layer according to the buried depth of the foundation, and calculate the longitudinal wave V within the depth range of the target layer by using the seismic exploration refraction method and the principle of surface wave exploration P , surface wave V r The apparent speed is used as the calculation basis.

[0045] 3. Calculate the dynamic parameters of the foundation soil:

[0046] Young's modulus:

[0047] Dynamic Poisson's ratio:

[0048] 4. Use the influence factor of the base si...

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Abstract

The present invention provides a method for rapidly measuring a natural foundation rigidity coefficient. The method comprises the steps of: respectively arranging seismic lines by taking the positionof a basic center point as a center in vertical-axis and horizontal-axis directions; according to the embedded depth of foundation, determining the depth of a target layer, and extracting a vertical wave apparent velocity VP and a surface wave apparent velocity VR of the target layer in the same arrangement and the same triggering gun through adoption of the seismic exploration refraction method and the surface wave exploration principle; taking a basic length-width ratio as a variable to perform inductive statistics of an actual project to obtain compressionstiffness influence coefficients [Eta]Z, [Eta][Phi] and [Eta]X through adoption of an arithmetic mean value method; calculating a kinetic parameter Young modulus Ed and a dynamic Poisson's ratio [Sigma]d of foundation soil; and calculating a rigidity coefficient of the foundation soil. The method for rapidly measuring a natural foundation rigidity coefficient does not need an excitation device, is short in test cycle and low in test cost, simplifies the test process, improves the test efficiency, is high in precision and can be applied to engineering practice.

Description

technical field [0001] The invention relates to the foundation stiffness coefficient in geotechnical engineering investigation, in particular to a method for quickly testing the stiffness coefficient of natural foundation. Background technique [0002] In geotechnical engineering investigation, the current test method for the stiffness coefficient of natural foundation is mainly the excitation method. This method needs to provide parameters such as the model, speed, power, position of the design foundation, and base elevation of the machine, whether it is free vibration or forced vibration. Vibration, there are problems such as heavy vibration equipment, long test period, complicated equipment installation and test process, and high test cost. Contents of the invention [0003] The present invention aims to solve the problems of bulky excitation equipment, long test period, complicated equipment installation and test process and high test cost in the current test method fo...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6242
Inventor 杨麟峰
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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