强夯法在粉细砂地层中的试夯效果评价  

Evaluation of Dynamic Compaction in Silty Fine Sand Soils

作　　者：陈国富 张振 赵保林 王中央 CHEN Guofu;ZHANG Zhen;ZHAO Baolin;WANG Zhongyang(Nuclear Industry Geological of Gansu 219 Division,Tianshui 741000;Tianshui Engineering Survey Institute of Nuclear Industry,Tianshui 741000)

机构地区：[1]甘肃省核地质二一九大队,甘肃天水741000 [2]核工业天水工程勘察院有限公司,甘肃天水741000

出　　处：《土工基础》2024年第4期725-728,738,共5页Soil Engineering and Foundation

摘　　要：选取广东某一项目典型粉细砂层场地做为试夯区,将A1试夯区经过5 000 kN·m能级分3遍强夯后,通过静载荷试验、标准贯入试验以及静力触探试验等实验方法对夯前夯后场地地基进行检测分析评价。结果表明:(1)相比夯前,A1试夯区夯后地基加固效果明显,其夯后场地地基承载力及压缩模量均能满足试夯要求;(2)试夯区粉细砂层有效加固深度约7~9 m;(3)标准贯入试验与静力触探试验的方法均能较好地评价粉细砂层夯后地基加固效果,且两种试验分析结果高度接近;(4)通过标准贯入试验实击数判定A1试夯区夯后场地液化消除。This trial compaction area for a typical silty fine sand layer site of a project in Guangdong is presented as a case history in this paper.After three times of the dynamic compaction using the 5000 kN·m energy level in A1 trial compaction area,the site soil was tested,analyzed,and evaluated by using the static plate load test,the standard penetration test and the cone penetration test.The results show that:(1)Compared with before the dynamic compaction,the effect of the soil improvement after the compaction is obvious;(2)The effective improvement depth of the silty fine sand layer is about 7 to 9 meters;(3)Both the standard penetration test and the cone penetration test can evaluate the compaction effect of the foundations soils after the dynamic compaction improvement.The results of the two types of tests are close to each other;(4)It is determined that the site liquefaction potential is eliminated after the dynamic compaction through the blow counts of the standard penetration test in A1 trial compaction area.

关 键 词：强夯 试夯区 地基检测 粉细砂层 有效加固深度 

分 类 号：TU472[建筑科学—结构工程]