摘要
为了解决广清城际铁路清远站某商业开发项目拟建场地内岩溶发育给建筑地基设计和施工带来的困难,通过详细的施工勘察,对场地地基稳定性分区、桩基选型、嵌岩深度和岩溶处理措施等问题进行了分析和总结。研究结果表明,拟建场地内岩溶整体发育程度为微-中等,Ⅱ区和Ⅳ区钻孔线岩溶率低于1%,属于岩溶稳定区;Ⅰ区和Ⅲ区钻孔线岩溶率均超过5%,属于岩溶不稳定区域。经计算,嵌岩桩入岩1. 5倍桩径可满足承载力要求(基岩面起伏大的地段需适当加深)。施工期间的岩溶处理宜采取回填、钢护筒跟进、注浆等方法。
In order to solve the difficulty in foundation design and construction brought by covered karst in commercial projects of Qingyuan Railway Station, research on division of karst area foundation stability, pile foundation selection, rock-socketed depth and treatment measures for karst has been conducted through construction geological survey. The results show that Ⅱand Ⅳarea of proposed building site whose karst development degree is low-medium with a line karst rate less than 1%, belong to stable zone of karst, whereas Ⅰand Ⅲarea with karst rate more than 5% develop to high karst degree and belong to unstable zone of karst. The calculation result also shows that pile foundation could maintain stability if piles are embedded into rock by 1.5 times pile diameter and more in some complex situations. Besides, the karst treatments during construction period should include backfilling, pile casing and grouting.
作者
万小乐
Wan Xiaole(China Railway Engineering Consulting Group Co. Ltd, Beijing 100055, China)
出处
《铁道勘察》
2019年第2期42-46,共5页
Railway Investigation and Surveying
关键词
岩溶
施工勘察
岩溶分区
桩基
Karst
Construction geological survey
Karst area partition
Pile foundation
