摘要
Abstract
Fly ash cement soil mixing pile not only can improve the foundation bearing capacity,but also can fully utilize the waste materials and protect the environment,which has great application value,however,the bearing mechanism of fly ash cement soil mixing pile is still unclear,and related research is needed.For this reason,in this paper,the effects of the relevant parameters(such as load,pile-soil modulus ratio,pile diameter and pile length)and the pile-soil stress ratio of the fly ash cement mixing pile are quantitatively investigated through on-site static loading tests,indoor compression tests and three-dimensional numerical simulations,so as to find the main controlling parameter.The conclusions are as follows:the pile-soil stress ratio shows a nonlinear evolution with the load,which increases and then decreases to a stable level;the modulus ratio and the pile diameter are the main controlling parameters,which are positively correlated with the stress ratio,but the influence of the modulus ratio tends to be weaker than that of the critical threshold.The pile length has less influence on the pile-soil stress ratio,and the pile-soil modulus ratio is the main controlling parameter affecting the bearing capacity.Therefore,when using hydraulic soil mixing piles to reinforce foundations in similar soil layers in the future,the appropriate pile-soil modulus ratio can be obtained by controlling the elastic modulus of the pile body to ensure that the bearing capacity of the soil around the piles can be fully utilized and to reduce the cost of the project.关键词
粉煤灰/水泥土搅拌桩/静载试验/数值分析/承载机理Key words
fly ash/hydraulic soil mixing pile/static load test/numerical analysis/bearing mechanism分类
能源科技
