Experimental study on rationalization design of MC strength composite piles in soft soil area
Through field tests in soft soil area,the influence of short-core,equal-core and long-core of MC stiff composite pile on the actual vertical compressive bearing capacity of single pile due to the change of inner core length is studied,and the design which type of MC stiff composite pile is more reasonable than the result data calculated by standard method is comprehensively analyzed.The results show that the soil conditions of bearing stratum at the end of inner core pile have certain influence on the vertical bearing capacity of MC stiff composite pile,especially for short core piles.When the end of inner core pile is located in a weak soil layer with high water content and large pore ratio,there is a large difference between the test results and the calculation results of code method,and there is a large potential safety hazard in the design.The bearing capacity of single pile with equal core piles is close to the test results by the code method.The bearing capacity of single pile of long core pile is slightly smaller than that of test results.The characteristic value of vertical compressive bearing capacity of long core pile can be better estimated by the calculation of standard method and is on the safe side.By analyzing and comparing the equal-core pile,long-core pile and short-core pile in MC stiff composite pile,it is found that the bearing capacity of single pile increases greatly,especially for long-core pile.The calculation result of code method raises by nearly 20％,and the test result raises by more than 40％.
new type of pileMC strength composite pilesshort-coreequal-corelong-core
NETL
NSTL
万方数据
