粉粒及黏粒含量对强夯加固粉细砂土层效果的影响  

Study on influence of silt particle and clay particle on dynamic compaction effect of silty fine sand

作　　者：李富春 张璟泓 周红星[2] 王婧[2] 梁小丛[2] LI Fuchun;ZHANG Jinghong;ZHOU Hongxing;WANG Jing;LIANG Xiaocong(Guangzhou Nansha Engineering Company of CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510230,China;CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中交四航局广州南沙工程有限公司,广东广州510230 [2]中交四航工程研究院有限公司,广东广州510230

出　　处：《人民长江》2022年第8期186-191,共6页Yangtze River

摘　　要：针对强夯法加固吹填粉细砂土层时细粒中粉粒及黏粒含量对加固效果的影响问题,采用模型试验的方法,选取两种不同粉粒及黏粒占比的细粒,配置了不同细粒含量的重塑砂样进行试验,得出了不同种类试验土体在强夯时的夯沉量、超静孔隙水压力及静力触探变化情况。试验结果表明:当细粒中不含黏粒时,细粒含量的影响转折点为10%,即当细粒含量小于10%时,细粒对强夯的影响较小;当细粒含量从10%增加到20%时,夯点附近的超孔压峰值减小14.2%,强夯有效加固深度减小36.7%。细粒中的黏粒对强夯加固效果造成的影响更大,黏粒含量超过5%时加固效果下降明显,含黏粒试验组的强夯有效加固深度相比同细粒含量的无黏粒试验组减少60%以上。研究结果对强夯加固粉细砂土层的设计及施工具有一定指导意义。In view of influence of the content of silt particle and clay particle on dynamic compaction of hydraulic fill silty fine sand,we prepared two kinds of remolded sand samples with different content of silt particles and clay particle,and applied the method of model test to simulate the dynamic compaction construction and obtain the changes of settlement,excess pore water pressure and cone penetration test of different kinds of test soil.The results show that in absence of clay particles,the turning point of fine particle content is 10%,namely when the content of fine particles is less than 10%,the influence of fine particles on dynamic compaction is small.However,when the content of fine particles increases from 10%to 20%,the peak value of excess pore pressure near the dynamic compaction point decreases by 14.2%,and the effective reinforcement depth decreases by 36.7%.The clay particles in the fine particles have more influence on the dynamic compaction effect.When the clay particles content exceeds 5%,the dynamic compaction effect deteriorates sharply.The effective reinforcement depth of the test group with clay content is 60%less than that of the test group without clay content.The results are valuable to dynamic compaction construction on hydraulic fill silty fine sand.

关 键 词：吹填土 粉细砂 细粒含量 黏粒含量 强夯法 模型试验 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程]