在软土地区建造桥涵浅埋式基础,常常由于表层地基土的强度不足造成构造物的沉降量较大、或有不均匀沉降以及滑动稳定性差,这时就需要进行地基的加固处理。 目前,应用于桥涵地基土的加固处理方法,按照地基处理的原则,一般可分为换土法、深层挤密法、排水固结法、浆液灌注法等,此外,在实际工程中,特别是在一些特殊地基处理中,还有旋喷法、树根桩法、石灰桩法等。 一、换土法 处理方法为: 换土(砂砾)垫层法 原理:挖除软弱地基层。此种方法可达到降低压缩性、提高抗剪性、改善动力特征防止液化的效果。适用于软粘土地基、人工填土、饱和粘性土、非饱和粘性土、无粘性土和湿陷性黄土等大部分地基类型。当地基为地 In shallow soil foundation construction of shallow buried foundation, often due to insufficient strength of surface soil caused by the settlement of the structure of large, or uneven settlement and sliding stability is poor, then the need for reinforcement of the foundation. At present, the reinforcement methods applied to bridge and culvert foundation soil can be divided into soil replacement method, deep compaction method, drainage consolidation method and slurry perfusion method according to the principle of foundation treatment. In addition, in practical engineering, especially, In some special foundation treatment, there are spin spray method, root pile method, lime pile method. First, for soil treatment method is: soil replacement (grit) cushion law principle: Excavation of weak ground. This method can be achieved to reduce compression, improve shear resistance, improve dynamic characteristics to prevent liquefaction effect. For soft clay foundations, artificial fill, saturated clay, unsaturated clay, non-cohesive soil and collapsible loess and most other types of foundation. The ground is ground