Behaviour of Piled Rafts with Piles of Different Lengths and Diameters Under Vertical Loading
|School||South China University of Technology|
|Keywords||Piled raft foundation Together Vertical load Pile arrangement Differential settlement|
With the vigorous development of China's construction works , pile raft foundation has been widely used in high-rise and high-rise buildings . Currently on pile raft foundation and soil interaction studies have made ??a lot of results, but the vast majority of these results is waiting pile length , pile diameter , etc. , etc. The traditional uniform cloth pile spacing obtained on pile foundations , and assuming conditions and formulas variety, and there are large differences in the actual project . Therefore, the project seeks to meet practical, economical and reasonable , safe and reliable design approach has been a raft of basic research in the field of an important issue. After reading predecessors in the field of piled raft foundation research results obtained on the basis of its achievements and summarized , got piled raft foundation work traits some rules . Currently on a different pile length and pile diameter pile raft foundation Traits of work is still limited , this article from the perspective of joint action , with the finite element software MIDAS / GTS, a three-dimensional finite element analysis model to analyze the vertical load and non- uniform uniform vertical loads with different pile diameter and length of pile raft foundation settlement characteristics , raft force, reaction force distribution pile and the pile lateral friction distribution . Also analyzed and compared with the same pile length different pile diameter pile raft foundation pile arrangement when several different operating characteristics based on the differences . The results show that load concentration and mutual influence of the core area of ??the larger set long piles or pile diameter increases , the basis for reducing the dish settlement, adjustment raft force quite effectively , but the pile longer than a certain value, continue to increase the length of the pile effect is no longer evident ; cloth pile in a uniform based on the increased pile - raft area than a pr can effectively reduce the footing , a pr greater subsidence is smaller. Analysis of the domestic and foreign piled raft foundation variable rigidity design some of the success stories, verified in the overloaded area, influenced each other 's core zone is set to increase long piles or pile diameter , and in outlying regions to set short pile or small diameter piles to reduce the basic difference between settlement and internal forces and leverage raft raft foundation soil bearing capacity under feasibility .