自钻式旁压测试获取软黏土变形模量研究

Study on the Deformation Modulus of Soft Clay Obtained by Self⁃Drilling Lateral Pressuremeter Test

为实现通过自钻式旁压试验获取软黏土变形模量,于杭州软黏性土地层开展自钻式旁压与螺旋板载荷试验对比研究。在初始膨胀阶段,旁压仪周围土体可假定为完全弹性,土体初始剪切模量可通过应变与压力关系获得。以此为基础,建立软黏土剪切模量与变形模量之间的转化关系式,拟合分析对比试验数据得到试验弹性阶段的转换系数λ=0.47,土体剪应变达0.5%时,λ=0.28。通过自钻式旁压试验获得剪切模量后,可使用该式便捷获取软黏土地层的变形模量,以满足该地区实际工程需要。

In order to obtain the deformation modulus through the self⁃drilling lateral pressuremeter test,the comparative study of the self⁃drilling lateral pressuremeter test and the spiral plate load test was carried out in Hangzhou soft clay layer.In the initial expansion stage,the soil around the side pressure meter can be considered to be completely elastic,and the initial shear modulus of the soil can be obtained by the relationship between the peripheral strain and the pressure.On this basis,the transformation relationship between the shear modulus and the deformation modulus of soft clay is established.The conversion coefficient of the elastic phase of the test is obtained by analyzing the data of the comparative test:λ=0.47,when the shear strain of the soil reaches 0.5%,λ=0.28.After obtaining the shear modulus through the self⁃drilling lateral pressuremeter test,the deformation modulus of the soft clay layer can be conveniently derived by this formula,so as to meet the needs of the actual project in the region.