强夯能量对饱和吹填土地基加固效果的影响

EFFECTS OF RAMMING ENERGY OF DYNAMIC CONSOLIDATION ON THE IMPROVEMENT OF SATURATED HYDRAULIC FILL

目前,强夯法加固吹填土地基应用很广,然而在吹填土地基加固的工程实践中所采取的单点夯击能量选择方面的分歧却相差很大。依托某油库区的吹填土地基工程,选用工程地质条件非常相近的3个场地分别进行不同能量的强夯试验,根据3种不同夯击能量下的强夯试验结果,比较不同强夯能量下,夯坑沉降量随着夯击次数和夯击遍数的变化趋势、孔隙水压力的演化过程、侧向位移和地表沉降的变化过程;最后,结合静力触探试验、标准贯入试验和荷载试验结果对不同强夯能量下吹填软土地基加固效果进行分析。研究表明,强夯能量是影响吹填土地基加固效果的重要因素,较大的夯击能量并不有利于吹填土地基的加固,存在一个最佳的强夯能量,在该能量下强夯的效果最好。

Dynamic consolidation is widely used in foundation reinforcement projects,but how to choose the ramming energy is still a difficult matter in foundation reinforcement project.The effects of ramming energy on the improvement of saturated hydraulic fill were studied.Here,different ramming energies were used in three fields with the same geological conditions of soil layer.It was compared the variations of the depth of pit with the numbers of drops and passes,the evolutions of pore pressure with time,the variation of the settlement of ground surface,and the variation of the lateral displacement along depth.The studies showed that there was an appropriate ramming energy.Besides,the results of static cone penetration tests,standard penetration tests and loading plate test were analyzed.Studies showed that ramming energy was an important factor in saturated foundation reinforcement project;there was an optimal ramming energy under which the consolidation of saturated foundation could achieve great effect.