土工格室加固地基的承载力计算探讨

Calculation of Ground Bearing Capacity of Geocell Reinforced Foundation

针对在地基加固方面,确定土工格室加固地基的承载力时,仍然套用土工格栅等平面筋材加筋层的计算公式,仅对其中的某些参数进行修正,计算出的地基承载力误差较大。鉴于上述原因,基于温克尔(E W inkler)弹性地基梁理论,推导了土工格室柔性筏基的地基承载力计算公式,确定相关计算参数,并用模型试验结果验证了公式的准确性。结果表明:本文推导的计算公式准确率较高;但该公式是基于已知沉降的情况下计算得到,对于P-S曲线有明显拐点的,存在一定的误差,影响计算承载力准确性的因素有很多,包括温克尔地基的假定前提,参数的取值等。

When determining geocell bearing capacity of reinforced foundation in the area of foundation improvement,the calculation formula about geogrid such as reinforcement layer is still applied,and only some of the parameters were modified,and the calculation error of the ground bearing capacity is large.Ground bearing capacity calculation formula of geocell flexible raft foundation was deduced based on E.Winkler＇s theory of elastic foundation beam.The related calculation parameters were fixed,and the accuracy of the formula was verified by model test result.The result indicates that（1） the deduced calculation formula has high accuracy,but the result is calculated based on the condition that sedimentation is known;（2） there is some error if there is obvious inflexion in P-S curve,and there are many factors affecting the accuracy of bearing capacity calculation,including assumption of E.Winkler foundation,parameter sampling and so on.