动力排水固结加固后南沙港区软土次固结性状试验研究  

Experimental Study on Behavior of Soft Soil of Secondary Consolidation in Nansha Harbor after Dynamic Drainage Consolidation

作　　者：张丽娟[1] 李彰明[1] 杨雪强[1] 

机构地区：[1]广东工业大学土木与交通工程学院,广东广州510006

出　　处：《中国港湾建设》2011年第5期40-42,共3页China Harbour Engineering

基　　金：广东省自然科学基金资助项目(06021462)

摘　　要：结合广州南沙港区淤泥质地基处理工程,对采用动力排水固结法加固后的软土次固结性状进行了试验研究。结果显示,夯击后土体的主次固结分界不明显,只有在固结压力水平较低、加荷比较大时能够划分主次固结;夯击加固后土体的次固结系数与固结压力有关,平均最大次固结系数约为原状土样最大次固结系数的30%,且存在一个最佳夯击能,使得加固处理后土体的次固结系数最小。Combined with soft soil improvement project in Nansha Harbour, Guangzhou, study on properties of soft soil of secondary consolidation after dynamic drainage consolidation is conducted. The experimental results show that the separation of primary and secondary consolidation of consolidated soil is not clear after the soil mass is dynamically compacted, but the primary and secondary of consolidation can be separated only when the consolidation pressure is low and the load ratio is high; the coefficient of secondary consolidation of improved soil after dynamic compaction is related to the consolidation pressure with the average highest coefficient of secondary consolidation being 30 % higher than that of undisturbed samples. There is an optimal tamping energy at which the coefficient of secondary consolidation of improved soil will be the least after soil improvement is completed.

关 键 词：次固结性状 动力排水固结 软黏土 夯击能 

分 类 号：TU472.31[建筑科学—结构工程] TU411.8[建筑科学—土工工程]