道路拓宽改造对邻近建筑地基变形影响分析与控制

Analysis and control of road widening and reconstruction loading influence on foundation deformation of adjacent buildings

针对道路拓宽改造引起邻近软土地基沉降时间长、不均匀沉降大且难以预测等问题,以某道路拓宽改造项目为工程背景,通过有限元分析、现场实测和理论计算研究邻近软土地基的沉降变形规律,提出一种附加荷载作用下软土地基变形的有限元分析预测方法。结果表明:出水池地基在不同监测点处沉降量变化较大,沉降不均匀;在同一监测点处,土层越浅,沉降速率越大,分层沉降量的最大值发生在压缩模量小的软土层中;考虑软土蠕变-固结耦合效应的数值分析结果与实测数据吻合较好,可用于预测软土地基工后沉降;采用一维固结理论沉降的计算结果与实测值相比偏大,因此,软土地基的沉降计算中考虑软土的蠕变效应是有必要的。

Targeting at the problems of long settlement time,large uneven settlement and difficult to predict of adjacent soft soil foundation caused by road widening and reconstruction,taking a road widening reconstruction project as engineering background,the settlement deformation law of the adjacent soft soil foundation was studied by finite element analysis,field measurement and theoretical calculation.A finite element analysis and prediction method for deformation of soft ground under additional load was proposed.The results showed that:The settlement of the foundation of the outlet pool varyied greatly at different monitoring points,and the settlement was uneven;At the same monitoring point,the shallower the soil layer was,the greater the settlement rate was,and maximum value of layered settlement occured in soft soil with small modulus of compression;The numerical results considering the creep-consolidation coupling effect of soft soil agreeed well with the measured data,which could predict the post-construction settlement of the soft soil foundation;The results of settlement calculation by using one-dimensional consolidation theory were larger than those measured and calculated,and it was necessary to consider the creep effect of soft soil in settlement calculation of soft soil foundation.