| The excavation and stability of the hectometers high rock slope are currently an important technical problem of the water conservancy project construction in China. Through the abundant geological investigation of construction tracing in situ-site, combining with the systematical deformation inspection and 3D numerical simulation, the slope with height of 700m in Xiaowan Hydroelectric Station is studied to present a series of geological and mechanics feedbacks such as deformation and unloading fracture during the process of the excavation of this large scale slope. Then, the stability of this kind of slope is discussed. The main results are showed as follows:(1) Based on the research of the hectometers high slope being artificial and complex, its deformation and fracture behavior during the process of excavation is systematically presented, whose geology & mechanics responding mechanism is obtained. Especially, several new phenomena and rules being different to the traditional ones are disclosed. Then, a rounded analyzing and evaluating method about large scale complex rock slope is formed, the experience of excavation is accumulated, which is helpful to the construction of the similar project in the future.(2) all kinds of geological structural planes being exposed are carefully recorded and described by means of closely tracing the process of excavation. On the basis of the documentation in situ-site, the structure characteristics of rock mass are deeply researched and systematically presented.(3)the reactive deformation of high rock slope with great sloping...
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