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《Journal of Hydroelectric Engineering》 2013-01
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Comprehensive criterion of dispersive soil and improvement of pinhole test

FAN Henghui,ZHAO Gaowen,LU Lina,LI Zhen(1.College of Water Conservancy and Architectural Engineering,Northwest A&F University,Yangling,Shaanxi 712100)  
Surface erosion or piping failure often occurs in the earth-work constructions with dispersive soil once subject to water.The dispersivity of soil is usually identified with five methods of double-hydrometer test,pinhole test,crumb test,pore water salts test and exchangeable sodium percent test,but sometimes all these methods produce different results,making the identification practically difficult.This paper studies the dispersivity criterion and the improvement of pinhole test through a case study of the core soil in the Songta hydropower.The results indicate that comprehensive identification criteria can be calculated by assigning a suitable weight to each of the methods.The results indicate that the weight values are given to the doublehydrometer test,pinhole test,crumb test,pore water salts test and exchangeable sodium percent test,which is 20%,20%,40%,10% and 10% respectively,then the total of dispersive,intermediate and non-dispersive values are calculated separately.(1) If the dispersive value exceeds 50%,the soil is dispersive;(2) If the dispersive value is 50% and the intermediate value is no less than 20%,the soil is dispersive.Otherwise,it is intermediate.(3) If the dispersive value is less than 50% and the dispersive and intermediate values are no less than 50%,the soil is intermediate.Otherwise,it is non-dispersive.This study reveals that after the pinhole test is finished,the pinhole of non-dispersive soil is not changeable,while the pinhole of dispersive soil becomes larger,but it is almost straight and trim.If the pinhole is trumpet-like and became softened,it is suggested that the pinhole wall is coated with adhesive material of 3 ~ 4mm thick to protect its free surface and prevent wrong identification.
【Fund】: 国家自然科学基金(50979094);; “十二五”国家科技支撑计划(2011BAD31B05);; 西北农林科技大学基本科研业务(QN2009089)
【CateGory Index】: TV443
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1 CUI Yi-hao,XIE Ding-song,YANG Kai-hong,LIU Jie(China Institute of Water Resources and Hydropower Research,Beijing 100044,China);Character of seepage failure and collapse cause of dispersive clay homogeneous earth dam[J];Water Resources and Hydropower Engineering;2004-12
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2 FU Xiwen,FU Huicheng,YANG Xiaolong,ZHANG Yingbo,GUAN Yue(Research Institute,Jilin Province Water Resource and Hydropower Consultative Company,Changchun 130012,China);Research on dispersibility of saline soil in Da'an area of Jilin Province[J];Yangtze River;2011-17
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4 LI Zhi-jing,ZHANG Xiao-ying,CHEN Shu-li,GONG Ji-chang(Institute of Geotechnical Engineering and Material Science,Yellow River Engineering Consulting Co.Ltd,Zhengzhou 450008,China);Identification Experimental Study on Dispersive Soil Under the Action of the Yellow River Water[J];Yellow River;2012-08
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