秸秆排水板室内降解试验研究  

Laboratory Testing of Degradation of Straw Wick Drains

作　　者：陈陶 邓明舜 苏银强 杨倩 陈广 张礼强 CHEN Tao;DENG Mingshun;SU Yinqiang;YANG Qian;CHEN Guang;ZHANG Liqiang(Zhuhai Communication Group,Zhuhai,Guangdong 519000;School of Transportation,Southeast University,Nanjing 211189;Suzhou Zhenze Wetland Tourism Culture Development Co.Ltd.,Suzhou 215000;Jiangsu Hongji Water Resource Technology Co.Ltd.,Yangzhou 225000)

机构地区：[1]珠海鹤港高速公路有限公司,广东珠海519000 [2]东南大学交通学院,南京211189 [3]苏州震泽湿地旅游文化发展有限公司,江苏苏州215000 [4]江苏鸿基水源科技股份有限公司,江苏扬州225000

出　　处：《土工基础》2024年第5期849-853,864,共6页Soil Engineering and Foundation

摘　　要：真空预压加固工程施工结束后,大量塑料排水板被遗留在地基内,不仅会引起白色污染,还可能污染地下水。采用秸秆材料制作可降解排水板,将3种不同的排水板进行室内降解实验,验证了秸秆排水板应用于工程的可行性,试验表明:秸秆排水板在土中会被菌群降解,通水量和抗拉强度均随时间的增加而降低,240 d降解率都接近40%。可降解排水板的通水量、抗拉强度小于塑料排水板,但都满足工程要求,可替代塑料排水板在真空预压加固工程中使用,不仅可以解决环境污染问题,而且拓展了秸秆资源综合利用新途径。In soil improvement with vacuum preloading projects,plastic prefabricated vertical drains(PVD or wick drains)are inserted into the foundation soils to provide vertical drainage channels.After construction,a large number of plastic wick drains are left in the soils,resulting in not just white pollution but also potential groundwater contamination.In this paper,three different types of biodegradable wick drains made of straws are laboratory tested.The feasibility of the straw wick drains to be applied in the practical engineering projects is verified.The results showed that the straw wick drains are degraded by bacteria in soils,the water discharge capacity and tensile strength decreases with the increase of time.The degradation rate is 40%after 240 days.The water flux and tensile strength of degradable wick drains are lower than those of the plastic wick drains,but they all meet the project requirements.It can be used instead of the plastic wick drains in the vacuum preloading soil improvement projects,which can not only solve the environmental pollution problem,but also expand a new way of comprehensive utilization of straw resources.

关 键 词：真空堆载预压 可降解排水板 秸秆资源利用 固结 

分 类 号：TU472[建筑科学—结构工程]