高速公路路基强夯加固机制分析  

Field Test Analysis on Reinforcement Mechanism of Soft Soil Foundation by Dynamic Compaction Method

作　　者：孙少锐[1] 韩银龙[1] 王亚杰[2] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]上海隧道工程股份有限公司,上海200082

出　　处：《西华大学学报（自然科学版）》2016年第3期93-96,共4页Journal of Xihua University:Natural Science Edition

基　　金：国家自然科学基金项目(41002089);国家十二五科技支撑计划(2012BAB29B02)

摘　　要：为探讨强夯对软土路基的加固效果,选取宿新高速公路典型地质条件路段,应用强夯置换法处理软土地基,在试验段确定3个试验点分别针对无碎石垫层、20 cm碎石垫层和40 cm碎石垫层3种工况进行试验,对试验过程中孔隙水压力的消散进行观测,得出超孔隙水压力随夯击能累计而增加,同时伴随消散而减少,使得峰值出现时间的早晚与夯点夯击顺序密切相关;对试验前后土体力学参数进行定量分析,发现垫层较厚的场地,随着孔隙水压力消散结束,在强夯试验结束一段时间后,土体颗粒间紧密接触,新吸附水逐渐固定,土的抗剪强度和变形模量都有了大幅度的增加。分析结果表明,强夯虽破坏了土体原有结构,但总体上提升了土体强度,加固效果明显。In order to research the reinforcement effect of soft soil foundation by dynamic consolidation,the section of Suxin expressway with typical geological conditions was chosen to carry out dynamic consolidation field test of soft soil foundation treatment based on dynamic replacement method. No gravel layer,20 cm gravel layer and 40 cm gravel layer were used to conduct the field test in different test point. The dissipation of pore water pressure with time was observed and analyzed during the test. The test results show that during the dynamic compaction,excess pore water pressure increases and then decreases. The peak time is in relation to the time of dynamic compact. The increasing of the soil strength for the thick gravel layers is relatively obvious. And the improvement of soil strength is remarkable by comparing the physical and mechanical parameters The results indicate that although the dynamic consolidation destroys original structure of soil,its strength is improved and reinforcement effect is obvious.

关 键 词：软土路基 强夯 孔隙水压力 现场试验 加固机制 

分 类 号：TU443[建筑科学—岩土工程] TU472.3[建筑科学—土工工程]