关于排水砂井未打穿深厚软土地基的固结度计算探讨

Discussion On the Calculation of Consolidation Degree of Deep Soft Soil Foundation Without Drainage Shaft Penetration

当排水砂井未打穿深厚软土地基时,其平均固结度由打了砂井部分土层的平均固结度和砂井以下土层的竖向固结度两部分组成。目前比较流行的常规法、谢康和法和Hart法计算结果接近,常规法最大,谢康和法次之,Hart法最小。通过实例验证3种方法计算结果基本上与贯入度Q值正相关,Hart法正相关性最好。根据砂井贯入度Q值,软土地基平均固结度的一种简明计算方法是根据砂井打穿软土地基时的平均固结度乘以一个小于1的系数ψ来确定,ψ与贯入度Q呈线性关系。

When the drainage sand well does not penetrate the deep soft soil foundation,the average degree of consolidation consists of the average degree of consolidation of some soil layers with sand wells and the vertical degree of consolidation of the soil layers below the sand wells.At present,the calculation results of the popular conventional method,Xie Kanghe method and Hart method are close.The conventional method is the largest,Xie Kanghe method is the second,and Hart method is the smallest.The positive correlation between the three methods and Hart penetration is basically the best.According to the penetration Q value of sand well,a concise calculation method of the average degree of consolidation of soft soil foundation is to multiply the average degree of consolidation when the sand well penetrates the soft soil foundation by a coefficient less than 1ψTo be sure,ψIt is linear with penetration Q.