公路软土地基加固处理及沉降分析

Reinforcement Treatment and Settlement Analysis of Highway Soft Soil Foundation

软土地基在我国公路建设中分布广泛。为了提升公路软土地基处理水平,分析了软土分布特点和工程特性,探讨了软土地基加固目标及换填法、强夯法、水泥搅拌桩和预应力混凝土管桩等常用加固技术在公路软土地基处理中的应用特点;阐述了分层综合法和有限元法计算软土地基沉降的原理,并利用有限元软件MIDAS/GTS建立二维平面模型,计算软土路基在水泥搅拌桩和预应力混凝土管桩加固前后的工后沉降。研究结果表明,预应力混凝土管桩对软土地基工后沉降的控制效果要优于水泥搅拌桩。

Soft soil foundation is widely distributed in highway construction in China.In order to improve the level of highway soft soil foundation treatment,the article analyzes the distribution characteristics and engineering characteristics of soft soil,and explores the application characteristics of commonly used reinforcement technologies such as soft soil foundation reinforcement targets and replacement methods,dynamic compaction methods,cement mixing piles,and prestressed concrete pipe piles in highway soft soil foundation treatment;The principles of layered comprehensive method and finite element method for calculating settlement of soft soil foundation were elaborated,and a two-dimensional plane model was established using finite element software MIDAS/GTS to calculate the post construction settlement of soft soil foundation before and after reinforcement with cement mixing piles and prestressed concrete pipe piles.The research results indicate that the control effect of prestressed concrete pipe piles on post construction settlement of soft soil foundation is better than that of cement mixing piles.