粉土负压排水规律试验研究  

Experimental study on negative pressure drainage law in silty soil

作　　者：韩旭[1] 徐浩伦 赵荐 叶晖[3] 孙红月[1] HAN Xu;XU Haolun;ZHAO Jian;YE Hui;SUN Hongyue(Ocean College,Zhejiang University,Zhoushan 316021,China;Quzhou City Highway Authority,Quzhou 324000,China;Unit 95979 of the PLA,Taian 271200,China)

机构地区：[1]浙江大学海洋学院,浙江舟山316021 [2]衢州市公路管理局,浙江衢州324000 [3]中国人民解放军95979部队,山东泰安271200

出　　处：《人民长江》2022年第3期175-180,共6页Yangtze River

基　　金：国家自然科学基金项目(41772276);浙江省公路管理局科技计划项目(2018H36)。

摘　　要：为了验证负压排水方法在粉土中的排水有效性,设计了室内圆筒物理模型试验。试验过程中监测负压值和排水量,并通过排水量计算平均排水速率。通过采用不同内径的排水管并多次改变排水路径,对粉土的负压排水规律进行了研究。试验结果表明:①在一定条件下,负压排水法可以实现粉土的高效排水,但与砂土不同的是,由于粉土渗透系数较小,排水过程中,负压达到稳定所需时间明显变长;②排水管内径影响着负压排水效果,当管径较大时,如6.5mm内径,因入渗水量不足以形成满管流诱发虹吸效应,难以产生稳定负压,导致其排水速率反而低于能够产生稳定负压的4 mm内径排水管,说明负压排水能显著提高排水速率;③排水路径对排水速率有一定影响,通过增加排水高差,增大排水管倾角,适当减小扬程,均可有效提高排水速率。In order to verify the effectiveness of negative pressure drainage in silt soil,an indoor cylinder physical model test was designed.During the test,the negative pressure value and drainage volume were monitored,and the average drainage rate was calculated through the drainage volume.By using drainage pipes with different inner diameters and changing the drainage path several times,the negative pressure drainage law of silt soil was studied.The test results showed that:(1)Under certain conditions,the negative pressure drainage method can achieve efficient drainage in silt.But being different from sandy soil,due to the small permeability coefficient of silt,the stabilizing time of the negative pressure during the drainage process was significantly longer.(2)The inner diameter of the drainage pipe affected the negative pressure drainage effect.When the pipe diameter was large,such as 6.5 mm,because the infiltration volume was not enough to form a full pipe flow to induce a siphon effect,it was difficult to generate a stable negative pressure,and the drainage rate was lower than that of a 4 mm inner diameter drainage pipe,indicating that the negative pressure drainage significantly improved the drainage rate.(3)The drainage path had a certain impact on the drainage rate.By increasing the drainage height difference,increasing the inclination of the drainage pipe,and appropriately reducing the head,the drainage rate can be effectively improved.

关 键 词：负压排水 粉土 排水管内径 排水路径 排水速率 

分 类 号：TU472[建筑科学—结构工程]