大直径素砼桩复合地基在岩溶场地中的应用

Aaalication of Large Diameter Plain Concrete Pile Composite Foundation in the Arst Area

以成都某红层岩溶场地的地基处理为例,分析场地岩溶发育的工程地质问题基础上,从场地的工程地质条件、岩溶发育分布特点等方面对场地内的岩溶发育特征进行分析研究,结合物探技术对处理前后场地进行复核,并对地基处理方式进行分析及措施评价。本岩溶场地采用大直径素砼桩复合地基,同时对溶蚀空洞进行封闭回填和灌浆等方式进行处理,以保证工程安全,处理后,满足设计要求。对处理后的复合地基的物探检测及大直径素砼桩的应力进行监测表明,采用该处理后达到设计及规范要求,为以后处理成都红层岩溶提供相关处理经验及依据。

Treatment of karst ground foundation in a red layer in chengdu area is taken as an example. Based on the analysis of karst geological problems,the characteristics of karst development are analyzed from the aspect of engineering geological conditions and distribution characteristics of the karst. Combined with geophysical technology,the field before and after processing is reviewed. The choice of the ways for ground treatment is analyzed and evaluated. The karst area adopts large diameter plain concrete pile composite foundation,and processes the karst cavity in the form of backfilling and grouting to ensure safety in engineering. After processing,it meets the design requirements. Geophysical detection of composite foundation and the monitor for the stress of large diameter plain concrete pile showed that this process can meet the requirements of design and standard,and it can provide relevant processing experience and basis for later processing of red beds karst in Chengdu.