土层选取对复合地基模量提高系数影响探究

Exploration of the Influence of Calculated Soil Layer Selection on the Improvement Coefficient of Composite Foundation Modulus

复合地基模量计算是影响沉降计算精度至关重要的参数。若复合地基涉及多层土时,计算土层选取对复合地基模量提高系数的影响较大。按规范法计算复合地基压缩模量提高系数时,当复合地基上层土压缩模量大于下层土压缩模量时偏保守;当复合地基上层土压缩模量小于下层土压缩模量时偏不安全;当复合地基上下层土压缩模量差异不大时,则计算复合地基模量结果差异也不大。由于计算土层选取对复合地基模量影响较大,建议规范中的复合地基沉降计算引入经验系数应考虑复合地基上下层土压缩模量差异的影响。

The correct calculation of the composite foundation modulus is a crucial parameter affecting the accuracy of settlement calculation.If the composite foundation involves multiple layers of soil,the calculation of soil layer selection has a greater impact on the improvement coefficient of composite foundation modulus.If calculated according to the canonical method,the improvement coefficient of the composite foundation modulus is conservative when the upper layer of the composite foundation soil compression modulus is greater than the lower layer of soil compression modulus,insecure when the upper layer of the composite foundation soil compression modulus is less,and not much different when there is little difference in the parameters of the stratified soil above and below the composite foundation.It is recommended that the empirical coefficient of sedimentation calculation in the specification consider the influence of the degree of difference in the parameters of the stratified soil above and below the composite foundation.