钉形搅拌桩单桩承载力的数值模拟分析

钉形水泥土搅拌桩是一种新型的水泥土搅拌桩技术,它解决了传统水泥土搅拌桩的诸多问题,具有良好的工程效果。该文简要介绍了钉形搅拌桩的施工机械和施工工艺,其采用的新工艺保证了桩体中的水泥掺入量,提高了水泥浆分布的均匀性,从而保证了桩身质量,特别是深部桩体的质量;主要采用三维有限差分法对钉形桩单桩承载特性进行了模拟分析,发现钉形搅拌桩单桩Q-s呈陡降型;其单桩极限承载力高于常规水泥土搅拌桩,并随扩大头高度H、扩大头直径D、桩长L和桩体模量Ep的增加逐渐增大。

Analysis on Numerical Simulation for Bearing Capacity of Single T-shaped Mixing Pile

T-shaped soil-cement mixing pile is a new soil-cement mixing pile technique,which can solve many problems of traditional soil-cement mixing pile and has the good engineering effect.The article briefly introduces the construction mechanism and construction technology of the T-shaped soil-cement mixing pile.Its new technology can guarantee the cement admixture into the pile and enhance the distribution uniformity of grout so as to ensure the quality of pile body,especially the quality of deep mixing pile.The 3D finite difference method is mainly used for simulative analysis of the bearing characteristics of single T-shaped mixing pile.It is found that the single pile Q-s of T-shaped mixing pile presents dropping type.The limit bearing capacity of its single pile is higher than the conventional soil-cement mixing pile.The bearing capacity will gradually increase with the increment of expanding head height H,expanding head diameter D,pile length L and Pile modulus Ep.