A Method for Quickly Measuring Static Earth Pressure Coefficient Using Penetration Resistance of CPT

Abstract

The invention discloses a method for static sounding of penetration resistance to rapidly test the static soil pressure coefficient. The method comprises the steps that firstly, the static sounding test is conducted on a soil layer of a measured area, and the tip resistance parameter qc and the static water level uw of the measured area are collected; secondly, the static soil pressure coefficient K0 is obtained through calculation, the calculation formula is K0=0.41n(Uc)+0.3; Uc=(sigmah-uw) / sigma'V; sigmah=0.45qc, wherein Uc is the tip resistance normalization stress ratio, and sigma'V is the vertical effective stress. By application of the method, the field static soil pressure coefficient changing value along with depth can be truly reflected, the uniform stratum stress historical state is accurately embodied and conforms to the engineering practice, field measurement data are provided for design on the premise that the testing technology means is not increased, the reconnaissance and design period is shortened, the reconnaissance cost is saved, efficiency is improved, and high popularization value is achieved.

Description

technical field [0001] The invention relates to the technical field of in-situ testing of geotechnical engineering, in particular to a method for rapidly measuring static earth pressure coefficient by using static penetrating penetration resistance. Background technique [0002] Static earth pressure coefficient K 0 As a relatively important technical index in the design of foundation engineering, it has a direct impact on the stress distribution, safety, engineering measures, and engineering cost acting on structures such as roadbeds, bridges, slopes, and retaining walls. Engineering practice shows that the static earth pressure coefficient K in the design and analysis of underground structures 0 The value of is very critical. Thanks to K 0 The determination of the value is affected by many aspects such as soil properties, neutralization stress, disturbance degree and soil structure, so the field determination of K 0 There are few and difficult methods to determine the ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the static earth pressure coefficient cannot be measured by static sounding, and propose a method for quickly measuring the static earth pressure coefficient by using static sounding penetration resistance

Images