Experimental Study And Numerical Simulation Of Composite Foundation Of Gravel Pile

Some elements'establishment,such as some roads, are constructed for progress of economy fast. When the highway where is soft ground is built, groundsill transact which is the bad geologic condition is indispensable for large tract in china. One of soft ground transact is gravel pile, which is applied largely because of cost lower. Based on loading test of gravel pile and composite foundation and the model of standard penetration hammering number N63.5 and shear wave Vs,bearing capacity and settlement numeration is analyzed by before and after the groundsill transact and the conclusion is educed. This thesis mainly completes the task in underside.(1)Some subsistent problem and significance of study is indicated and research and numeration method is use to gravel pile of composite foundation by reading of references and investigative actuality.(2)Theory elements and scheme and controlling standard of test is expounded and some relation between bearing capacity and settlement is established by some field tests singly. The test indicates:â‘ When replacement ratio is lower, bearing capacity of composite foundation is improved lower. In a way it is unsatisfied with demand of design, and replacement ratio influence with effect of soft ground transact. Because of setting of granular fill, bearing capacity is enhanced largely, and elevated extent associates with thickness of granular fill.â‘¡Based on static loading test directly or indirectly, it indicates that the distinction of bearing capacity is large.Bearing capacity in direct method is larger than in indirect method. And then, relation of them is established.â‘¢Through field test of Raleigh wave and SDS, making use of the model of standard penetration hammering number and shear wave, bearing capacity of composite foundation is calculated, and compared with result of static loading test in direct method. And then, the relation of bearing capacity in Raleigh wave and static loading test in direct method is established.By settlement computation, this relation of composite modulus and Raleigh wave is also established in composite modulus method.â‘£Based on static loading test, pile-soil stress ratio n of composite foundation is calculated and analyzed and it exists in range of variety.It is possible for providing referenced worth for future project.(3)Pile-soil stress ratio n of composite foundation is calculated and analyzed in numerical simulation method.It indicts that the result accords with the one of static loading test. So the method is use to economizing the cost and shortening time limit and superviseing future test.(4)In conclusion, based on numerical simulasion of composite foundation, it can provide a direction for design and construction in hohhot.Finally, content of study is summed up, some problem is pointed out and advises is brought forward for future task.