| Miaowei hydropower station is located in Dali prefecture, yunnan province, yunlong county in the town of jiuzhou state on the lancang river, Lancang river seven development plan in the final stage of hydropower station, The above is a dahua bridge hydropower station,The hydropower station close to the middle and lower reaches of the lancang river reach Gongguo bridge.Dam site zone development has a large toppling deformation on both sides, And developed severe deformation. Development of spillway slope rock mass has water inlet toppling deformation phenomenon, The excavation direction almost perpendicular to the surface and strata, In the process of construction,Also appears a series of deformation phenomenon, The stability of the toppling deformation slope rock mass during construction period and operation period of the slope is of great significance for water inlet.Therefore, based on the Miaowei on the left bank hydropower station spillway water inlet slope as the research object, Adopt the method of geological analysis, Numerical simulation analysis method and consider water storage and water level changes of the stability study, etc,In-depth analysis and research into the water inlet slope deformation characteristic and its stability was evaluated. The main results were as follows:(1) The slope geological engineering conditions was studied. According to the survey of the slope during the construction of the scene, water Inlet of the slope rock mass structure characteristic is studied, The results show that the slope water inlet development more extrusion fracture zone, schist zone and weak quartz vein along the level, Upstream side slope rock mass is broken, Soft rock and hard rock layer distribution.(2) Into water inlet the toppling deformation mass engineering geology model is established.According to the on site water inlet slope dumping of fine description of rock mass structure, Dumping of deformation of the slope were analyzed the difference between the occurrence of rock mass and rock slope, On the slope rock mass structure partition.Structure of advantage the development characteristic and the function of the control of the slope stability analysis, At the same time, analysis of data of adit.(3) To carry out laboratory test research of slope rock mass.The hard rock group test for the point load test; The test study of schist including conventional triaxial test and creep triaxial test, Experimental results show that the intensity is low, Within the rock mass fracture development, Especially the triaxial creep test measured the creep of weak schist is stronger, About 75% of the long-term strength is the instantaneous strength.(4) Determine the water inlet slope toppling deformation mode of deformation and destruction.Through the analysis of slope deformation monitoring data and based on the classification of slope excavation discrete element numerical simulation, Analyze the response characteristics of the stability of slope under excavation,The excavation surface rock toppling deformation characteristics, Determines the dumping of the dumping of the slope deformation and failure mode of integration of deformation may be produced play dump- slip cracking patterns.(5) To water into the canal slope stability analysis and water level fluctuation, the slope stability is evaluated. Through the entrance channel water storage and water level in the process of lifting process of slope stability analysis, reservoir to cut export stability in storage level below the sliding surface, water level decline to its disadvantage. According to potential sliding surface of spillway entrance channel slope stability analysis for a long time, the results show that water storage condition of stability coefficient of meet the design requirements;Working condition of rainfall and earthquake, although the stability coefficient decreases, but potential slip surface stability coefficient is still greater than 1.15, meet the design requirements.Only in the extremely bad working condition of the reservoir, rainfall and seismic stability coefficient under the combination of to reduce to 1.1 or so, but it is greater than 1.05, still meet the design requirements.To sum up, the slope stability coefficient meet the design requirements. |
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