岩溶地区桩基施工溶洞处理技术——以吉安永和大桥桩基施工为例  

KARST CAVE DISPOSING TECHNOLOGY FOR PILE FOUNDATION CONSTRUCTION,ILLUSTRATED WITH——YONGHE BRIDGE IN JI'AN

作　　者：石振明[1,2] 沈丹祎 彭铭[1,2] 林杰豹[3] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《工程地质学报》2015年第6期1160-1167,共8页Journal of Engineering Geology

基　　金："十二五"国家科技支撑计划(2012BAJ11B04);国家自然科学基金项目(41372272;41402257)资助

摘　　要：在岩溶地区进行桩基施工时溶洞的处理是桩基施工成功与否的关键因素。本文系统总结了溶洞对桩基的影响、溶洞处理的一般原则和处理方法的选择依据,并结合江西吉安某大桥项目的工程地质条件和周边环境等,综合考虑工程安全、质量、工期、成本等多方面因素,选择最佳的溶洞处理施工方案。该方案在实践中很好地防止了周边地面沉降过大,保证了孔壁稳定性,提高了成桩质量,同时也为今后类似项目的溶洞处理提供了参考依据。Karst cave disposing is crucial for pile foundation construction in karst area. This paper systematically summarizes the influence of Karst cave to pile foundation,the principle of Karst cave disposing and the basis on selection of disposal methods. As an example,the pile foundation construction of the Yonghe Bridge in Ji'an City,is taken to show how to choose the optimal strategy in practical projects. The geologic conditions,surrounding environments,and project issues( safety,quality,construction schedule and costs) are taken into account. The scheme in practice shows good results in preventing large ground subsidence,ensuring the stability of hole wall,and improving the quality of the piles. The study provides a reference for the similar projects of Karst cave treatmentin the future.

关 键 词：岩溶 桩基施工 溶洞处理 护筒跟进 溶洞回填 

分 类 号：P642.25[天文地球—工程地质学]