电厂溶洞地基处理关键技术和疑难问题分析

Key Technology and Difficult Proble Analysis of Karst Cave Treatment in Power Plant Project

[目的]针对电厂工程中经常存在的复杂岩溶及土洞地基问题以及岩溶及土洞地基处理设计中的疑难问题和施工中容易出现的问题,如超前钻、灌注桩及管桩施工疑难问题等。[方法]阐述了相关的岩溶及土洞处理关键技术,包括处理原则、处理方法(包括充填法、跨越法、桩基法)等内容,并结合相关规范、费用和实际工程经验进行分析对比。[结果]给出了岩溶及土洞地基处理中出现的疑难问题解决办法及溶洞地基桩基冲孔施工容易出现的问题及应急预案。[结论]最后总结了电厂岩溶地基几种处理办法,可以作为同类工程的参考。

[Introduction]The paper aims to sovle the sub-grade problems cause by complex karst and soil cave foundation,design problems in karst and soil cave foundation treatment design,construction problems often occurred in power plant projects,such as advanced drilling,bored pile and PHC pile construction difficult problems etc..[Method]To describe the relevant karst and soil cave treatment key technologies,including treatment principles,treatment methods(including filling method,crossing method,pile foundation method),we analyzed and compared the relevant specifications,costs and practical engineering experience.[Results]The results we obtained is the solutions to the difficult problems in the treatment of karst and soil cavern foundation and the problems that are easy to occur in the punching construction of pile foundation of karst cavern foundation and the emergency response plan.[Conclusion]Finally,several treatment methods of karst foundation in power plant are suggesed,which can be used as reference for similar projects.