摘要
由于湿陷性黄土由于特殊的物理力学性质,若涵洞地基处理措施不当或处理深度不够,往往容易引起涵洞下沉开裂等病害。从对青海东部4条高等级公路黄土区内408座涵洞的调查结果来看,病害率较高,发生病害的涵洞共379座,病害率达92.9%,涵洞病害主要表现为浸水淤积导致的涵洞下沉、涵节错位及路面开裂等。根据现场调研的情况及规范的要求,以青海民小公路为依托,采用不同桩间距灰土挤密桩处理涵洞地基,开展现场试验对涵洞沉降进行观测。结果表明,灰土挤密桩处理后的涵洞沉降远小于换填垫层处理的涵洞沉降,而两种桩间距灰土挤密桩沉降差异较小,建议桩间距取值为1.0m^1.2m;且涵洞进出口铺砌的施工措施应予以加强。
Due to the special physical and mechanical properties of collapsible loess,if improper measures to handle culverts or inadequate depth of treatment are often easy to cause disease such as sink and crack of culverts.From the survey of 408 culverts in the loess area of 4 high-grade highways in east Qinghai,there are 379 culverts with disease incidence rate of 92.9%,and the main culverts are culverts caused by water and siltation sinking,culvert joints and pavement cracking.According to the site research and regulatory requirements,based on Qinghai Min-Xiao Highway,the foundation of culverts was treated with lime-soil compaction piles with different pile spacing,and field tests were carried out to observe the settlement of culverts.The results show that the settlement of culverts treated by lime soil compaction piles is much smaller than that of replacement culverts,and the settlement difference between two pile spacing of lime soil compaction piles is relatively small.The recommended piles spacing is 1.0 m to 1.2 m.The construction measures of culverts import and export should be strengthened.
出处
《青海交通科技》
2017年第5期58-61,共4页
Qinghai Transportation Science and Technology
关键词
黄土
涵洞
地基处理
挤密桩
换填垫层
loess
culvert
foundation treatment
compaction pile
replacement cushion
