岩溶区复杂地质下的桩基施工工艺研究  

Research on Pile Foundation Construction Process under Complex Geology in Karst Area

作　　者：汪荷玲 刘小刚 WANG Heling;LIU Xiaogang(Guangzhou City Polytechnic,Guangzhou 510405,Guangdong,China;Guangzhou Urban Planning&Design Survey Research Institute Co.,Ltd.,Guangzhou 510060,Guangdong,China)

机构地区：[1]广州城市职业学院,广东广州510405 [2]广州市城市规划勘测设计研究院有限公司,广东广州510060

出　　处：《工程技术研究》2024年第24期11-16,共6页Engineering and Technological Research

基　　金：广州城市职业学院2023年校级教科研项目(一般项目)“广东地区岩溶地质分析及桥梁桩基全套施工工艺研究”(KYYB2023019)。

摘　　要：针对岩溶区复杂的地质环境,传统的溶洞处理措施往往过于单一,无法适应地质的变化。文章针对岩溶区岩层直覆软卧层这一特殊地质,提出运用高压旋喷注浆法加固软卧层的土体强度,提高软卧土层的稳定性;针对超大溶洞或多层串珠状溶洞等特殊地质,提出运用孔内导管灌注水下混凝土充填溶洞工艺,快速形成高强的溶洞充填物,确保桩基成孔和混凝土灌注全过程孔壁安全。这两种工法在工程中取得了良好的应用效果,为此类项目的顺利开展提供了有益参考。In view of the complex geological environment in the karst area,the traditional karst cave treatment measures are often too single to adapt to geological changes.Aiming at the special geology of the soft soil layer overlain on the rock layer in the karst area,this paper proposes to use high-pressure rotary jet grouting method to strengthen the soil strength of the soft soil layer and improve its stability;aiming at the special geology such as superlarge karst caves or multi-layer beaded karst caves,it proposes to use karst cave filling process with underwater concrete pouring in the conduit inside the hole,so as to quickly form high-strength karst cave fillings and ensure the safety of the hole wall in the whole process of pile foundation pore forming and concrete pouring.These two methods have achieved good application results in the engineering,which provides a useful reference for the smooth development of such projects.

关 键 词：溶洞处理 高压旋喷加固 水下混凝土灌注法 桩基施工 

分 类 号：TU473.1[建筑科学—结构工程]