表面喷洒SH固土剂的泥石流堆积土的抗雨蚀性能  

RAIN EROSION RESISTANCE OF DEBRIS FLOW FAN SPRAYED BY SH AGENT ON SURFACE

作　　者：王永雷 柴寿喜 李敏[3] WANG Yonglei;CHAI Shouxi;LI Min(School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384;School of Geology and Geomatics,Tianjin Chengjian University,Tianjin 300384;School of Civil and Transportation,Hebei University of Technology,Tianjin 300401)

机构地区：[1]天津城建大学土木工程学院,天津300384 [2]天津城建大学地质与测绘学院,天津300384 [3]河北工业大学土木与交通工程学院,天津300401

出　　处：《工程地质学报》2018年第2期334-339,共6页Journal of Engineering Geology

基　　金：国家自然科学基金(51409079;41272335);河北省自然科学基金(E2014202104);高等学校博士学科点专项科研基金(20131317120013);天津市科技支撑重大项目(15ZXCXSF00070)资助

摘　　要：降雨对堆积土的径流冲刷和入渗软化,是引发泥石流的关键因素。选取甘肃张掖泥石流现场堆积土为研究对象,借助人工模拟降雨试验,研究100 mm·h-1的降水强度下表面喷洒SH固土剂的泥石流堆积土的抗雨蚀性能。试验结果表明,未喷SH固土剂的堆积土,表面雨蚀严重,形成数条冲刷沟,且伴有大量泥沙流失;喷洒SH固土剂后,SH固土剂与表层土颗粒胶结形成高强黏结性的塑性胶膜,堆积土表面无明显冲痕,冲刷量少,抗雨蚀性能强;随SH固土剂喷量增加,固化土的抗雨蚀性能先增大后趋稳定;SH固土剂与粉土和砂土颗粒形成结构稳定的"镶嵌式"土膜混合层,整体上优于碎石土"漂浮式"土膜混合层的抗雨蚀性能;SH固土剂喷量和堆积土土质类型共同影响着固化土抗雨蚀性能。综合考虑费用、抗雨蚀效果等因素,建议对粉土和砂土类的堆积土,SH固土剂喷洒量为1.0 kg·m-2,对碎石土类,应适当增加喷洒量。The key to debris flow initiation is rain erosion and infiltration.With the controllable intensity artificial rainfall experiment,debris flow alluvium of Zhangye City,Gansu Province was chosen as media to study rainfall erosion-resistant on the 100 mm·h-1 heavy rain conditions.And debris flow alluvium was sprayed on surface with SH agents.The results of this study are as follows.The untreated soil surfaces were eroded obviously and formed several erosion gullies and it had a large number of erosion particles in bottom.However,soil treated with SH agent had significantly rainfall erosion-resistant.The protective layer formed by SH agent connecting soil particles had strong adhesion.There were no obvious trances and only a few erosion particles existed.Moreover,rainfall erosion-resistant first was strengthened then stabilized with increasing SH amounts.“Mosaic structure”layer formed on silt and sand soil were more stable than that of“floating structure”layer formed on gravely soil.The rainfall erosion-resistant was effected by SH agent amounts and soil types.Considering of aspects of cost and rainfall erosion-resistant etc.,the findings suggest that a SH agent amount of 1.0 kg·m-2 would be ideal for silt and sand soil,but need aptly to increase SH agent amounts for gravely soil.

关 键 词：泥石流堆积土 抗雨蚀性能 SH固土剂 冲刷量 冲刷面形态 

分 类 号：P642.23[天文地球—工程地质学]