摘要
以青溪大桥桥基岩溶洞穴围岩工程地质条件定性-半定量-定量分析为基础,在岩土自重和桩基的外附荷载作用下,对桥墩所在位置的溶洞顶板稳定性进行综合评价。利用自行研制的钻孔多点位移计对施工荷载施加过程中溶洞及项板岩体的变形进行现场监测,该仪器综合了传统多点位移计和收敛计对深部岩体和岩层表面分别进行监测的优势,利用同一组数据对施工影响下溶洞洞体和顶板的变形规律进行分析。结果表明,在重大施工荷载作用下保证8.0 m溶洞顶板厚度是安全稳定的,大大节约了溶洞处理费用,并为类似的岩溶洞穴稳定性施工提供了有力的技术支持。
Based on the qualitative and quantitative analysis of engineering geology of karst cave wall rock under bridge foundation, the roof stability of karst cave was comprehensively evaluated under roof rock weight and pile foundation loading. The multipoint extensometers were inbuilted in karst rock, and deformation of karst cave and cave roof rock mass was monitored on-site during construction processes. This apparatus integrales lhe advantages of conventional multi-point extensometers and convergence gauge which can monitor deformation at differenl depths and surface layer of rock, and the displacement of karst caveroofs and karst caves of different thickness was analyzed. Karst cave roof whose thickness is more than 8. 0 m is stable under high roof rock weight and pile foundation loading. It would reduce the investment in treating karst cave, and it supplies technical guide for similar stability analysis of karst cave roof.
出处
《地球与环境》
CAS
CSCD
北大核心
2005年第3期10-14,共5页
Earth and Environment
基金
西部交通建设科技项目(200231800018)湖北省环境岩土工程重点实验室开放课题(T110301)
关键词
溶洞顶板
稳定性综合评价
多点位移计
karst cave roof
comprehensive evaluation of stability
multi-point extensometers
