基于静力触探测试的深基坑工程土体设计参数应用研究

APPLICATION OF SOIL DESIGN PARAMETERS IN DEEP FOUNDATION PIT ENGINEERING BASED ON STATIC CONE PENETRATION TEST

为确定深基坑工程中强度指标和变形参数输入的精确性,以红安恒大文化旅游康养城项目DC02地块岩土工程勘察为研究背景,通过原位测试的方法,各个土层的静力触探数据进行采集,并基于静力触探试验强度指标和变形参数拟合公式对各参数进行计算,并与室内试验结果进行比较。结果表明,静力触探试验得到的粘聚力值与内摩擦角均比室内试验快剪试验得到的粘聚力值和内摩擦角小,室内试验强度指标得到的土压力偏大;针对各土层压缩模量,由静力触探试验和室内固结压缩试验观测得到数值,两者具有显著的线性回归关系。

In order to determine the accuracy of the input of strength indicators and deformation parameters in deep foundation pit engineering,this paper takes the geotechnical engineering survey of DC02 Block of Hong’an Hengda Cultural Tourism and Health City Project as the research background,collects the static penetration data of each soil layer through the method of in-situ test,calculates each parameter based on the strength indicators and deformation parameter fitting formula of the static penetration test,and compares them with the indoor test results.The results show that the cohesion value and internal friction angle obtained from static penetration test are smaller than those obtained from indoor quick shear test,and the soil pressure obtained from indoor test strength index is larger;For the compression modulus of each soil layer,the values obtained from static penetration test and indoor consolidation compression test have a significant linear regression relationship.