劲性水泥砂浆土组合模型桩的极限承载力试验研究

Experimental study on ultimate bearing capacity of reinforced cement mortar pile of soil composition model

通过在劲性水泥土组合模型桩的外芯水泥土中掺入适量的砂,形成劲性水泥砂浆土组合模型桩,实施静载试验得出,当最佳掺砂量为10%时,组合模型桩的极限承载力将明显提高。在水泥土(a_s=0%)里掺入一定砂量后,当水泥砂浆土抗压强度大于水泥土抗压强度时,混凝土芯桩周边水泥砂浆土将产生近似竖向、环向裂缝,并从混凝土芯桩底到混凝土芯桩顶2/3L区域范围缩小到1/2L区域范围内,且有沿着桩身向下移动的趋势,为工程应用提供参考依据。

By incorporating the right amount of sand in the soil cement composition model stiff outer core soil cement pile,forming a reinforced cement mortar pile of soil composition model,do static load test and find that the amount of sand mixed with 10%,the ultimate combination of model pile bearing capacity significantly increased. After the incorporation of the approximate amount of sand in the vertical soil cement（ a_s= 0%）,the compressive strength of the soil when the mortar compressive strength greater than when the soil cement,concrete core pile of cement mortar surrounding soil generated from the ring to crack concrete core bottom of the pile to the top of the pile of concrete core regional 2 /3L,1 /2L down to the regional level,is to move along the pile downward trend,to provide reference for engineering applications.