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咸阳-淳化-旬邑高速公路位于陕西省咸阳市西北部,沿线湿陷性黄土不良地质分布范围广,路基特殊处理面积大,给公路工程建设带来较大影响和隐患。为确保公路路基的加固效果,本工程地基处理采用强夯、冲击碾压、灰土挤密桩、灰土垫层、灰土隔水墙等措施来消除地基的部分湿陷性,提高地基承载力减少路基沉降。本文结合咸旬高速公路5标路基工程的实际施工,对湿陷性黄土路基的处理措施进行一下探讨。
Xianyang-Chunhua-Xunyi Expressway is located in the northwestern part of Xianyang City, Shaanxi Province. The wide range of unfavorable geological distribution of collapsible loess along the roadbed and the special treatment area of subgrade are large, which brings great impact and hidden danger to highway construction. In order to ensure the reinforcement effect of highway embankment, the foundation of this project is treated with dynamic compaction, impact rolling, lime-soil compaction piles, lime-soil cushion and lime soil water-barrier to eliminate partial collapsible foundation and improve the bearing capacity of foundation to reduce the embankment settlement. In this paper, with the actual construction of No. 5 subgrade of Xian-Xun Expressway, the treatment measures of collapsible loess subgrade are discussed.