不同排水板真空预压软土加固对比试验研究  

Comparative experimental study on soft soil reinforcement by vacuum preloading with different band drains

作　　者：李长辉 武航 程国勇[1] 陈宇 金敏 常雷 LI Chang-hui;WU Hang;CHENG Guo-yong;CHEN Yu;JIN Min;CHANG Lei(School of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;China Railway Beijing Engineering Group Co.Ltd,Beijing 102308,China;Shenzhen Houkun Soft Rock Technology Co.,Ltd,Shenzhen,Guangdong 518031,China)

机构地区：[1]中国民航大学交通科学与工程学院,天津300300 [2]中铁北京工程局集团有限公司,北京102308 [3]深圳厚坤软岩科技有限公司,广东深圳518031

出　　处：《岩土力学》2022年第10期2819-2827,共9页Rock and Soil Mechanics

基　　金：天津市技术创新引导专项基金企业科技特派员项目(No.21YDTPJC00470);中国民航大学科研启动基金(No.2020KYQD45)。

摘　　要：针对目前排水板真空预压加固过程中出现的加固效果不良的问题,现有研究大多针对真空预压加载方式,而对于新出现的不同结构类型的排水板缺乏理论及试验研究。采用3种不同排水板进行真空预压模型试验,对比了不同排水板在真空预压过程中的加固规律及效果。试验结果显示,双面连通排水板和秸秆排水板加固后的土体含水率相较于普通排水板分别降低了9%和5%,且十字板剪切强度平均提高了1.7 kPa和1 kPa。说明双面连通排水板具有更好的防淤堵特性,且新型秸秆排水板在具有环保特点的同时,能够比普通塑料排水板取得更好的加固效果,为解决真空预压加固效果欠佳的问题提供了新的解决思路。At present,for the problem of poor reinforcement effect in the process of vacuum preloading using band drains,most of the existing studies focus on the vacuum preloading loading mode,while there is a lack of theoretical and experimental studies on the emerging drains of different structure types.In this study,three types of band drains are selected for vacuum preloading model tests,and the reinforcement law and effect of different band drains in the process of vacuum preloading are compared.The test results show that the soil moisture contents of soil treated by double-sided connected drains and straw band drains are reduced by 9%and 5%respectively as compared with the conventional band drains,and the vane shear strength is increased by 1.7 kPa and 1 kPa on average.It means that the double-sided connected band drains has better anti-silting performance,and the straw band drains can achieve better reinforcement effect than the common band drains while having the characteristics of environmental protection,which provides a new solution to solve the problem of poor reinforcement effect of vacuum preloading.

关 键 词：排水板 真空预压 软土 含水率 

分 类 号：TU447[建筑科学—岩土工程]