| The inverse triangle high slope up to 245 meters high locates at No.2 mountain girder slanted by spandrel, left bank of Xiaowan Hydroelectric Power Station. The spandrel being excavated on a large scale destroyed the initial frame and stress state of the rock in the slope. In this thesis, based on abundant geological investigation and combined with structure statistics of the excavated slope, monitoring data analysis and numerical simulation, the destroyed evidence of the slope is analyzed and generalized in reason. According to the stability reaction of the excavated slope, protecting scheme is appreciated, stability of the slope is predicted in operation and corresponding advising timbering measures are given in the thesis. The main conclusions are shown as follows:1,The distribution, attitude and the thickness rule of IV structure face as well as the distribution and trace length rule of V structure face have been statistically calculated combining with the slope excavation construction. Also, the rock mass structure characteristic of No.2 mountain girder inverse triangle excavated slope has been fully studied and the different geological engineering districts for the No.2 mountain girder have been figured out as district Ⅰ(scattered structure), district Ⅱ (weak unloading-steep postpone controlling slope), district Ⅲ(weak unloading- steep postpone controlling slope),district Ⅳ(nearly fresh mass slope).2, According the distortion of the No.2 mountain girder in digging, establish the destroy mode, range and project infection, analyzing the mechanism and generalizing in reason.3,By comprehensive analysis of the data, it shows: the elevation accumulation body is in stabilization after being dug, not forming unitive distortion. The slope goes to stabilization as the grubbing of Slot between arch excavation. The digging of bottom in slot between arch excavation results in springback of foundation pit, furthermore, bring the springback of middle and lower slope. After digging the... |
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