高速公路拼接段地基处理设计分析方法与工程实践

针对新、老高速公路拼接段的两种拼接型式——直接拼接和分离拼接 ,对新建路基实施拼接后 ,以超载形式引起已建高速公路产生的附加沉降的不良影响进行研究 ,选择了造价低、施工方便的沉降隔离墙方案。应用土体固结非线性有限元法 ,对锡澄与沪宁高速公路拼接段中的隔离墙在工程中所起的作用进行数值模拟 ,计算分析表明 ,隔离墙的存在可有效地减少锡澄高速公路拼接后对沪宁高速公路主线中心的附加沉降量。

ANALYSIS METHOD AND ENGINEERING PRACTICE OF FOUNDATION TREATMENT DESIGN OF CONNECTION SECTION OF HIGHWAYS

Two types of connection between newly built and existing highway sections, the direct and the separate connections, have worse influence of additional subsidence on existing highway by overloading after the connection of new built foundation. Isolating wall which is of low cost and convenient to construct is adopted. The role of isolating wall for connection between Xicheng and Huning highways is numerically simulated by using non linear finite element method far soil mass consolidation. Compution and analysis show that isolating wall can effectively reduce the additional subsidence of Huning highway main line centre reduced after its connection with Xicheng highway.