The Research On Bearing Characters Under Vertical Load For Rock-socketed Pile Based On Water-rock Interaction

Since the normal operation of the three gorges reservior.The hydraulic engineering congstruction is increasing at home.The construction of hydraulic engineering in the region surrounding have a significant inpact on rock mass and other engineering structure.The regular service of the hydraulic engineering making the upstream and dowmstream area of rock mass under the water level change and present a periodic immersion an drying.This will have a great impact on the mechanical properties of rock/soil.Also have a great impact on slope instability,embankment settlement and the port area of pile foundation bearing capacity.In order to find out under water level cyclical change,rock mechanics properties influence and rock-socketed piles under the influence of the changing rule of the load-bearing characteristics.In this paper,based on use of infrastructure projects in the ministry of communications,The chongqing port orchard area of sandstone as experiment material of “wetting and drying cycle” to simulate the characteristic rock under natural state.We make moisture content test of rock,rock triaxial test and split test to determine the mechanical parameters of rock under water level change,further research and analysis of the vertical load-bearing characteristics of rock-socketed piles.And according to the research results that can provide a certain basis on actual project construction and design.What is said above,the main means are the way of experiment and numerical simulation.The results of this test is provided by HeYe.First to acquisition of rock specimen number and water circulation processing,and then make mechanical experiment.Analysis change rule of mechanical parameters and stress-strain curve obtained from the experiment,and establish the constitutive relation.We can use numerical simulation to find out the relations,the rock-socketed piles in the area of water-level fluctuation is different in the mechanical characteristics of the system comprehensive.This paper studies the main content includes the following four aspects.(1)Through the water cycle to determinating triaxial test and split test,To test the water absorption and mechanical parameters of the logarithmic function relationship to describe the parameters of rock and water circulation cycle times.The result shows that with the increase of water cycle,the internal friction Angle of the rock,cohesive force,mechanical parameters and elastic modulus beacome significantly reduced.So rock was damaged(2)Assume stress-strain relationship of rock test in the triaxial test between with a Weibull distribution and use it to describe the rock mechanics stength distribution.based on Mohr Coulomb strength criterion We establish the constitutive relati of rock under water cycle.Resulting display the constitutive model is validated.(3)Calculated by finite element modeling is different,different pile diameter of rock-socketed depth under the influence of water cycle of the bearing capacity of rock-socketed pile,and then compare the results.It is concluded that under the action of the water cycle of the ultimate bearing capacity of rock-socketed pile,pile side friction resistance,axial force of pile and pile end strengthing effect under a number of water.(4)Other influencing factors in the analysis of practical engineering,such as sediment.Calculates the conclusion and the problems in the practical engineering analysis,Suggestions in the region with higher water level of rock-socketed pile design,should pay attention to the effect of water rock on the bearing capacity of rock-socketed pile.