| Longkaikou hydroelectric power station is planning to be constructed on Jinsha Rive, The stratum of dam site area is mainly to be the basalt of the Permian. There exists a rock mass structure system including thrown zone dipping against or against the bed, extrusion fragmentized zone, faults, fractures. The faults zone dipping with the bed has a certain thickness, a good connectivity, thrust through all the dam site, constitute the basic frame of geotectonic and structure of rock mass. The tilt of Thrown zone dipping with the bed -a important component of the rock mass structure-is low, extend to a certain length, thrown zone dipping with or against the bed combined with series of fractures, controls the structure of rock mass on dam site, and formed the problems of geo-engineering. It is necessary to find out the effect on the seepage by the rock mass structure for the safety of the building and running the electricity station.Based on the project named "the characteristic of rock mass structure of Longkaikou hydroelectric power station on Jinsha river and the influence of the engineering", The author analyses the mechanism to controlling the seepage by the rock mass structure, the main conclusion is as follows:(1) Based on the investigation of the geological environment, analyzed each genesis for each fractures of rock mass.(2) According to analyzing the characteristic of all kinds fractures carefully, grade the fractures into four degrees: II, III, IV and V.(3) By analyzing the stress field, studied the seepage capability under a certain stress field.(4) Using the geometry parameters gotten by surveying on the spot, calculating the seep tensor, get the conclusion : the changing rule between them.(5) Take the analysis on the data of bore hole Hydraulic pressure test as a back, contrast the Lu, Vp and RQD, find the seepage characteristic of base rock mass on horizontal and vertical two directions. And based on this upon, point out the suggestion depth of the impervious curtain. |
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