高压旋喷桩复合地基承载力与沉降计算方法分析

Analysis of calculation methods for bearing capacity and settlement of high-pressure chemical churning pile composite foundation

以具体工程为背景,以准确翔实的承载力与沉降量实测资料为依据,对高压旋喷桩复合地基的承载力、沉降量实测值与计算值进行了对比与分析。结果表明,旋喷桩复合地基载荷试验时承压板下桩数不同,测得的复合地基承载力也不同,承压板下桩数越多,所得的承载力标准值越低;高压旋喷桩的加固深度与承台宽度的比值 l/B 对复合地基沉降量的计算有较大影响;用分层总和法计算复合土层的沉降量时,复合土层压缩模量的不同计算方法,会使计算结果出现较大差异。

Based on the concrete project, the accurate and detailed measured data of bearing capacity and settlement values, and through analyzing and comparing the measured data of bearing capacity and settlement values of high-pressure chemical-churning-pile composite foundation with the calculated values, the chemical-churning-pile composite foundation load-bearing test shows that the different composite foundation bearing capacities can be measured for the different numbers of the piles under the loading plate; and more piles under the loading plate, less standard value of the measured bearing capacity. The ratio of the reinforcement depth of the high-pressure chemical-churning-pile to the width of the base slab greatly effect the calculation of the composite foundation settlement value. When the method of the layer-built summation is used to calculate the settlement value of the composite foundation, the great difference between the results comes from the different methods used to calculate the compressive modulus of the composite foundation.