重庆市仙女山台地岩溶发育特征及工程效应研究

Karst Characteristics and Engineering Effect Study for the Platform in Xiannü Mountain,Chongqing Municipality

仙女山台地属三峡地区最高一级夷平面,海拔1 700～1 900 m,经过长期的剥蚀作用,使地表形成和缓起伏的丘陵状地貌。通过对仙女山台地的地质调查及岩土工程勘查揭示,地表岩溶地貌主要有溶沟、石芽、落水洞及岩溶漏斗;地下岩溶有溶洞、地下暗河等,发育受岩性、构造、地形地貌及新构造运动的控制。地下溶洞及土洞的半定量计算揭示该区地下溶洞总体稳定,仅有个别规模较大的土洞处于欠稳定状态,工程建设应采取适当处理措施。

Xiannü platform is the highest plane surface in the Three Gorge with elevation from 1 700～1 900 m.Through long planation,the surface becomes gentle hilly topography.Through geologic and geotechnical investigation of the Xiannü platform,we found that surface karst landform mainly contains clint,ponor and karst funnel;and underground karst includes karst caves,underground river,etc.The development is mainly controlled by lithology,structure,topography and new tectonic movement.Semi-quantitatively calculation to karst caves reveals that most of these karst caves are stable except several biggish soil caves which we should put forward the relevant measures in engineering construction.