摘要
黄土地区高速铁路隧道洞口明挖段地基处理方法的选择应着眼于消除湿陷性与控制沉降变形的双重标准。以兰州市榆中县某黄土高速铁路隧道洞口明挖段地基处理为例,采用水泥土挤密桩进行地基处理时发生塌孔、缩孔,变更为钻孔桩并在桩顶设置钢筋混凝土刚性托板的桩板结构处理方案后,地基处理效果良好。说明了黄土隧道明洞段地基处理方法应结合黄土含水率、湿陷性等诸多因素通过技术经济比较后合理地选用。
The choice of foundation treatment method for open cut section of high-speed railway tunnel in loess area should focus on eliminating double standards of collapsibility and controlling settlement and deformation. In this paper, Yuzhong county, Lanzhou city, taking a loess high-speed railway tunnel excavation section of the foundation treatment as an example, the use of cement-soil compaction pile for foundation treatment occurs when the hole collapsed and shrinkaged, changed to bored pile, and reinforced concrete rigid support plate is set to the top of the pile, the pile-plank structure has good effect of foundation treatment. It is shown that the method of foundation treatment in loess tunnel should be selected rationally according to the technical and economical comparison with the factors such as water content, collapsibilitv and so on.
出处
《岩土工程技术》
2017年第4期163-166,199,共5页
Geotechnical Engineering Technique
关键词
高速铁路
黄土隧道明洞
地基处理
水泥土挤密桩
柱锤冲扩桩
桩板结构
high-speed railway
open cut section of loess tunnel
foundation treatment
cement-soil compaction pile
column hammer-expansion pile
pile-plank structure
