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Method of using standard penetration test blow count N for detecting relative density Dr of sandy soil of Yangtze River estuary, sand spit and barrier island stratums

A technology of standard penetration number and relative density. It is applied in the field of foundation soil survey, construction, infrastructure engineering, etc. It can solve the problems of complex test process and obvious influence of soil sample disturbance on test results, so as to solve the complex test process. , good promotion and application prospects, and the effect of improving the efficiency of exploration experiments

Inactive Publication Date: 2014-12-03
TONGJI UNIV
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Problems solved by technology

[0003] The indoor relative density test needs to determine the natural void ratio, maximum void ratio and minimum void ratio of the undisturbed soil sample, the test process is complicated, and the test results are obviously affected by the disturbance of the soil sample

Method used

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  • Method of using standard penetration test blow count N for detecting relative density Dr of sandy soil of Yangtze River estuary, sand spit and barrier island stratums
  • Method of using standard penetration test blow count N for detecting relative density Dr of sandy soil of Yangtze River estuary, sand spit and barrier island stratums
  • Method of using standard penetration test blow count N for detecting relative density Dr of sandy soil of Yangtze River estuary, sand spit and barrier island stratums

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Embodiment 1

[0018] Embodiment 1: according to the present invention, the number of hits with standard penetration N Detection of relative density of sandy soil in Yangtze River Estuary, Sand Spit and Sand Island The method has been widely used in the liquefaction deformation analysis of Qingcaosha Reservoir in Shanghai. N and relative density Carry out correlation analysis to get the number of standard penetration hits N and relative density The correlation formula is as follows:

[0019] (1)

[0020] In the above formula, for the Changjiang Estuary, Sand Spit, and Sand Island strata, a =13, b =12.

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Abstract

The invention relates to a method of using standard penetration test blow count N for detecting relative density Dr of sandy soil of Yangtze River estuary, sand spit and barrier island stratums. The method includes the steps: (1) penetrating a standard penetrometer into a sandy soil layer, and recording blow count when penetration depth of the penetrometer is 30cm as the standard penetration test blow count N; (2) calculating overlying effective pressure, in corresponding depth, of the soil layer; (3) according to the detected standard penetration test blow count N and the calculated overlying effective pressure, working out the relative density Dr of the sandy soil according to a formula. By adoption of the method, calculation of the relative density of the sandy soil is facilitated, the problem of difficulty in taking undisturbed samples of sandy soil for testing is solved, exploration test efficiency is improved, soil sample test cost is saved, and calculation results are reliable.

Description

technical field [0001] The invention relates to a method for detecting the relative density of sandy soil, in particular to a method for detecting the relative density of sandy soil by means of standard penetration N Calculation of Relative Density of Sandy Soil in Yangtze River Estuary, Sand Spit and Sand Island Methods. Background technique [0002] Relative density is an indicator of the compactness of incohesive coarse-grained soil, and it is of great significance to the stability of structures and foundations built with soil as a material, especially in terms of seismic stability. At present, the conventional method of obtaining the value is to take the original sample in the drilling hole, and conduct a relative density test in the laboratory to obtain the relative density of the soil layer. [0003] The indoor relative density test needs to measure the natural void ratio, maximum void ratio and minimum void ratio of the undisturbed soil sample. The test process is ...

Claims

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Application Information

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IPC IPC(8): E02D1/02
Inventor 黄雨杨洋朱崇强王琳
Owner TONGJI UNIV