Method of Determining Liquefaction of Shallow Sand Soil Using Variable Energy Dynamic Penetration Sounder

A technology of dynamic penetration and energy, applied in the field of exploration, can solve problems such as uneconomical, scattered, and long engineering lines, and achieve the effect of solving shallow sand liquefaction and being easy to use

Inactive Publication Date: 2011-12-21
NINGXIA HUI AUTONOMOUS REGION ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drilling machinery needs road repairs and compensation when it reaches the tower site, and the power transmission and gas transmission lines are long, with many points and scattered, and each point has to be repaired and compensated, even if the construction period is delayed, it is not economical

Method used

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  • Method of Determining Liquefaction of Shallow Sand Soil Using Variable Energy Dynamic Penetration Sounder
  • Method of Determining Liquefaction of Shallow Sand Soil Using Variable Energy Dynamic Penetration Sounder
  • Method of Determining Liquefaction of Shallow Sand Soil Using Variable Energy Dynamic Penetration Sounder

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Experimental program
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Embodiment Construction

[0014] The standard penetration test and the variable energy dynamic penetrometer were used to conduct the test at the same time, the same place, and the same depth in different geology. The test data are as follows:

[0015]

[0016]

[0017]

[0018] Through the above experimental data, it is found that in the sandy soil and silt soil formation, the linear regression equation relationship between the variable energy dynamic penetration test and the standard penetration test is as follows:

[0019] q d =0.1863N+0.697

[0020] After optimization, it is obtained: q d =(0.185~0.187)N+(0.68~0.7) (1)

[0021] The reference value Q of dynamic penetration resistance for liquefaction determination can be calculated from formula (1).

[0022]

[0023] Insert the formula (4.3.4-1) of "Code for Seismic Design of Buildings GB 50011-2001" to get the critical value Q of dynamic penetration resistance for liquefaction discrimination cr .

[0024] Q ...

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Abstract

The invention relates to an exploration method, in particular to a method for judging the liquefaction of shallow sand with a variable energy dynamic penetrating sounder. Carry out exploration; use the formula qd=(0.185~0.187)N+(0.68~0.7) to calculate the obtained data; where: qd is the dynamic penetration resistance of the cone head in the variable energy dynamic penetration test, unit: mPa, N is: standard Penetration test blow count; comparison; when the test value qd<critical value Qcr, it can be judged as liquefaction; Qcr is the critical value of penetration resistance Qcr. The invention converts the reference value N0 of the standard penetration hammer number and the critical value Ncr of the standard penetration hammer number into dynamic penetration resistance, so that the liquefaction can be judged by the variable energy dynamic penetrating test. The method has the characteristics of being convenient to carry and use, saving time and labor, and being economical and quick.

Description

technical field [0001] The invention relates to an exploration method, in particular to a method for judging shallow sandy soil liquefaction by using a variable energy dynamic penetrating sounder. Background technique [0002] In the alluvial plain of the Yellow River, the groundwater level is relatively high, the seismic intensity is high, and sand and silt are common. There are many similar geological conditions in other regions of my country, and liquefaction discrimination is generally required in engineering surveys in these regions. The current general liquefaction discrimination method in my country is the standard penetration test method. This method is to use the winch to lift the standard penetration test device during the mechanical drilling process, and conduct the hammer test at each predetermined test depth. The current "Code for Seismic Design of Buildings GB 50011-2001" stipulates that when the liquefaction of sand within 15m is judged, when the standard pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/00
Inventor 李长风李容
Owner NINGXIA HUI AUTONOMOUS REGION ELECTRIC POWER DESIGN INST
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