Research On The Horizontal Bearing Characteristics Of Pile Socketed In Sofe Rock At Plateau Reservoir Area

Rock-socketed pile, due to pile capacity and the notable feature of low sedimentation, has been widely used in the port project. Its study of the mechanism and operating characteristics has not been very well, especially to the relative lack of rock-socketed pile deterioration with the lithology of the bearing behavior.The large amplitude of the water level was affected by the plateau port projects in the reservoir area underwater soft rock foundation, so that foundation strength will be reduced, which made the class foundation bearing capacity of rock-socketed piles have a significant change in the existing norms in the soft rock pile base, but there is no clear and complete method of calculation. In order to ensure the safety of hydraulic structures on the highland reservoir area of underwater soft rock foundation, it is necessary.for highland reservoir area underwater soft rock foundation embedded in the rock pile bearing capacityto have a research. Combined with the science and technology projects of Yunnan Provincial Communications Departmen:special hydrogeological conditions of the highland reservoir area of port construction projects key technology research-"under the water level of large amplitude, the level of soft rock socketed pile bearing capacity of research". Fu Ning harbor is located in the highland reservoir area, has a complex terrain, has much soft rock in the surface rock and weathered rock fissures, poor stability. Under the conditions of cyclical changes in water level of reservoir, the engineering mechanical properties of the reservoir banks of soft rock foundation would change greatly, which would affect the pile bearing performance. Rock mechanics parameters to rock with the number of saturated degradation under a project basis and Yunnan Fu Ning Kong as the background, the establishment of deterioration with the lithology of the different periods (the natural state of water-saturated secondary, four, twelve), physical model, analysis of the lithology in different periods of deterioration on the load-displacement, load-bending moment, the moment, the moment the maximum and the location of impact. Inversion, the physical model as the basis for the establishment of variable slope, the numerical model in the case of rock-socketed depth and lithology deterioration. The research results show that with the lithology deterioration, the pile bending moment was zero gradually down, the horizontal displacement increased, under the same load bearing capacity of pile foundation to reduce; bedrock slope changes from15degrees to30degrees between the pile based horizontal displacement of greater impact, that is the bedrock slope is greater, the horizontal displacement of the greater; pile embedded in rock at depths greater than the depth of the moment0:00required increase in the depth of rock-socketed pile bearing capacity of no effect. And this study results were compared with the existing design specifications. The depth of the soft rock-socketed pile should be greater than7D, for steep slope should be greater than8D.