大厚度湿陷性黄土填方地基增湿强夯试验研究  

Experimental Study on Wetting and Dynamic Compaction of Large Thickness Collapsible Loess Fill Foundation

作　　者：徐文涛 张忠雄 董宝志 于永堂[1,4] 范开伟 XU Wentao;ZHANG Zhongxiong;DONG Baozhi;YU Yongtang;FANG Kaiwei(School of Civil Engineering,Xi'an University of Architecture ard Technology,Xi'an,Shaanxi 710055,China;Ningxia Dynamic Compaction Machinery Engineering Co.,Ltd.,Yinchuan,Ningxia 750003,China;Shanxi Jinbaodao Foundation Engineering Co.,Ltd.,Taiyuan,Shanxi 030031,China;Zhonglian Northwest Engineering Design and Research Institute Co.,Ltd.,Xi'an,Shaanxi,710077,China;Lanzhou University of Technology Engineering Testing Technology Co.,Ltd.,Lanzhou,Gansu 730207,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]宁夏强夯机械工程有限公司,宁夏银川750003 [3]山西金宝岛基础工程有限公司,山西太原030031 [4]中联西北工程设计研究院有限公司,陕西西安710077 [5]兰州工大工程检测科技有限公司,甘肃兰州730207

出　　处：《水利与建筑工程学报》2023年第1期151-159,共9页Journal of Water Resources and Architectural Engineering

基　　金：陕西省秦创原“科学家+工程师”队伍建设项目(2022KXJ-086);国家自然科学基金项目(41790442);陕西省重点研发计划(2020ZDLSF06-03)。

摘　　要：为评价超高能级增湿强夯在低含水率、大厚度湿陷性黄土地基处理中的应用效果,在兰州市某工业建筑场地平整工程的填方区开展了25 000 kN·m能级的增湿强夯试验,分析了注水增湿效果及施工参数、地基土含水率对强夯处理效果的影响规律。试验结果表明:当场地存在上部虚填土、下部原地基土的二元结构时,在注水增湿过程中易在二元分界面形成溶洞,造成含水率局部过高或过低;当土体含水率向最优含水率逐步接近时,强夯对减小湿陷系数、降低孔隙比和提高干密度的效果逐渐增强;单击夯沉量与夯击次数之间近似呈指数函数关系,利用该关系可预估达到某一夯沉量控制值时所需的夯击次数。In order to evaluate the application effects of ultra-high energy level wetting and dynamic compaction in the treatment of collapsible loess fill foundation with low water content and large thickness, a 25 000 kN·m level wetting and dynamic compaction test was carried out in the filling area of an industrial building site leveling project in Lanzhou City, and the effects of water injection on wetting, construction parameters and the law of the influence of water content of foundation soil on the dynamic compaction treatment effect were analyzed. The test results show that when the site has a binary structure of upper virtual fill and lower original ground soil, it is easy to form karst caves at the binary interface during the process of water injection humidification, resulting in local high or low water content. When the soil moisture content approaches to the optimum moisture content, the effect of dynamic compaction on reducing the coefficient of collapsibility, reducing the void ratio and increasing the dry density is gradually enhanced. The relationship between the single click tamping settlement and the number of tamping blows is approximately exponential function, which can be used to estimate the number of tamping blows required to reach a certain control value of tamping settlement.

关 键 词：强夯法 湿陷性黄土 大厚度 增湿 

分 类 号：TU43[建筑科学—岩土工程]