高能级强夯处理晋中深厚湿陷性黄土地基的试验研究  

Experimental study on high energy level dynamic compaction treatment of deep collapsible loess foundation in Jinzhong

作　　者：马鹏兵 徐晓 曹静远 MA Peng-bing;XU Xiao;CAO Jing-yuan(Shanxi CIG City Operation Group Co.,Ltd.,Taiyuan 030013,Shanxi,China;Shanxi Survey Design Research Institute Co.,Ltd.,Taiyuan 030013,Shanxi,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China)

机构地区：[1]山西建投城市运营集团有限公司,山西太原030013 [2]山西省勘察设计研究院有限公司,山西太原030013 [3]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《地基处理》2023年第S02期19-25,共7页Journal of Ground Improvement

摘　　要：为评价16000 kN·m能级强夯处理深厚湿陷性黄土地基的效果,在晋中某建筑工程场地内进行了试夯试验,开展了地面高程观测、探井取样、室内试验、动力触探试验。试验检测结果表明:单击夯沉量随着夯击次数的增加逐渐降低,随着夯击遍数的增加,夯沉量趋于平稳所需击数减少;经过强夯处理后,终夯面下11 m深度范围内,干密度提高了9.4%,压缩模量提高了150.6%,孔隙比降低约22.5%,压缩系数降低21.7%,湿陷系数均小于0.015,地基土湿陷性基本消除;不同深度土层的动力触探击数介于4.2~13.3击,平均击数为10击。试夯试验结果可为晋中地区深厚湿陷性黄土场地的强夯处理及施工提供参考。To evaluate the efficacy of 16000 kN·m energy level dynamic compaction in treating deep collapsible loess foundation,a series of trial compaction tests were conducted at a construction site in Jinzhong.These tests included ground elevation observation,exploratory well sampling,indoor tests,and dynamic penetration tests.The results show that the settlement of single click compaction gradually decreases with the increase of compaction times.Additionally,with the increase of compaction times,the required number of blows for the compaction settlement to stabilize decreases.Following intensive compaction treatment,within an 11 m depth range below the final compaction surface,several significant improvements were observed:dry density increased by 9.4%,compression modulus increased by 150.6%,void ratio decreased by approximately 22.5%,compression coefficient decreased by 21.7%,and the coefficient of collapsibility reduced to values below 0.015.This effectively eliminated the collapsibility of the foundation soil.Furthermore,the number of dynamic penetration blows of soil layers at different depths is between 4.2 and 13.3,with an average of 10 blows.These test results serve as valuable references for the design and execution of dynamic compaction treatments for collapsible loess in Jinzhong.

关 键 词：高能级强夯 深厚湿陷性黄土 湿陷系数 孔隙比 压缩模量 动力触探 

分 类 号：TU472[建筑科学—结构工程]