大型基础下含软弱夹层的层状砂土变形计算

Calculation on Deformation of Layered Sandy with Weak Interlayer Under Large Foundation

基于饱和土的相关理论,推导了大型基础下层状地基的沉降计算模型.考虑不同的土性,根据修正剑桥模型和摩尔-库伦模型,推导了K0条件下且能够考虑其塑性变形的压缩模量.基于平面网格子域法结合分层总和法建立了一个完整的、更加贴近工程实际的大型基础下含软弱夹层的层状砂土地基沉降计算模型.研究结果表明:该模型的计算结果与模拟结果很贴近,且能够突出体现出软弱夹层的变形特性.研究结论可为含软弱夹层的大型基础地基沉降计算提供直接参考依据.

A settlement calculation models of layered subgrade under large foundation was established based on theories of saturated soil.Taking the different soil properties and the modified Cam-Clay and Mohr-Coulomb models into account,the compressive modulus were derived by considering the plastic deformations under the condition of足0.Based on the subfield of planar mesh and the layer-wise summation method,a settlement calculation model of layered sandy foundation base with weak interlayer under large foundation was established,which is more close to the engineering practice.The results showed that the calculation results by the suggested model are comparatively close to the numerical simulation results,and can clearly reflect the characteristic of deformation in weak interlayer.The suggested calculation model can provide basis to the settlement calculation of layered sandy foundation base w ith weak interlayer under large foundation.