基于孔压静力触探试验确定黏性土压缩模量研究

Study on Determination of Cohesive Soil Compressive Modulus Based on Pore Pressure Static Penetration Test

黏性土是我国沿海地区广泛分布的一种低强度土体,通常具有高含水率、大孔隙以及低渗透性的工程特征。实际工程应用中,基于现场孔压静力触探试验方法确定黏性土压缩模量Es,在此基础上,计算软基沉降量是目前最常用的手段之一。本文依托江苏省某公路黏性土试验工点,开展现场孔压静力触探试验,获取重要测试参数,并以计算得到研究区域黏性土体的压缩模量值作为参考值,进而与其他经验方法进行对比,在此基础上提出了新的黏性土锥尖阻力-压缩模量相关关系,结果表明,根据本文方法计算得到的黏性土地基沉降量与实际观测值非常接近。证明本文模型确定压缩模量及预测地基沉降量方法的有效性。

Clay soil is a kind of low-strength soil widely distributed in coastal areas of our country,and usually has the engineering characteristics of high water content,large pores and low permeability.In practical engineering applications,the compressive modulus Es of cohesive soil is determined based on the on-site pore pressure static penetration test method.On this basis,the settlement of soft foundation is calculated,that is one of the most commonly used methods at present.In this paper,relying on a road cohesive soil test site in Jiangsu Province,the field pore pressure static penetration test was carried out to obtain important test parameters,and the compressive modulus value of the cohesive soil in the study area was used as a reference value,and then compared with others.The empirical methods are compared,and a new relationship between cone tip resistance and compressive modulus of cohesive soil is proposed.It is proved that the model in this paper is effective in determining the compressive modulus and predicting the foundation settlement.