Analysis of rockmass' stability at Baitupo slope in Badong new town,Hubei Province

The 3rd section of Badong Formation is one of the major strata where landslides developed in Three Gorges reservoir,the rock of T2b3 is mainly consisted of limestone and the weak intercalated layers in T2b3 composed of argillaceous limestone and calcareous mudstone.The cores of monitoring drills were compared,the result showed several fractured weak zones developed in T2b3 and these zones is consequent and continuous.the major thirteen penetrative weak intercalated layers of the 3rd section of Badong Formation at Baitupo slope developed,and most were located at middle and top part,the three penetrative weak intercalated layers corresponding to the lower part of T2b3at Baitupo slope developed at Xirangpo slope.It was concluded that the weak intercalated layers are the major structural planes of deep-seated rock mass at slopes.The analysis of stability of Baitupo deep rock show that the stability decreased gradually with the increase of reservoir’s water level,but Baitupo slope was still in integral stable status,the F3 fault on the leading edge of Baitupo provided the boundary condition for slope’s deep deformation.