三峡永久船闸高边坡深部岩体变形及地应力变化特征

为了解三峡永久船闸施工期及运行期深部岩体的变形及地应力变化特征,利用已有的8#勘探平洞,预埋多点位移计及地应力监测传感器,实施了近10 a的中隔墩岩体变形全过程及3 a施工期岩体地应力变化监测。根据深部岩体变形监测结果,对船闸施工期间及通航以来中隔墩岩体的变形发展特征进行了分析;其次基于地应力变化监测成果,研究了实测的岩体应力值与数值模拟结果、变形值反演结果之间的关系。

DEFORMATION AND GEOSTRESS CHANGE CHARACTERIZATION OF DEEP ROCKMASS OF PERMANENT SHIPLOCK SLOPE FOR THE THREE GORGES PROJECT

With the purpose of acquiring rockmass deformation and geostress change characterization on the permanent shiplock slope of the Three Gorges Project(TGP),the original exploratory adit of No.8,which was intersected with the middle-isolated pier of the permanent shiplock slope,was utilized to be a place for installing multi-point borehole extensometers(MPBX) and geostress change sensors;and the whole process of rockmass deformation monitoring for the middle-isolated pier has lasted nearly 10 years in company with 3 years geostress change monitoring.On the basis of results of deep rockmass deformation monitoring,rockmass deformation characterization of the middle-isolated pier is investigated during construction period and navigation period;and the deformation tendency of rock wall of the middle-isolated pier is obtained;in addition,results of in-situ geostress change monitoring,numerical modeling results by FEM and back analysis results based on MPBX data are compared and analyzed.The stability of the permanent shiplock slope is discussed at last.