高分子稳定剂加固河道边坡表层砂土室内试验研究  

Laboratory study on surface sand soil of river slope reinforced with ecotypic soil stabilizer

作　　者：汪勇[1] 刘瑾[1] 宋泽卓 白玉霞[1] 王琼亚 祁长青[1] 孙少锐[1] Wang Yong;Liu Jin;Song Zezhuo;Bai Yuxia;Wang Qiongya;Qi Changqing;Sun Shaorui(School of Earth Science and Engineering,H ohai University,Nanjing,211100,China)

机构地区：[1]河海大学地球科学与工程学院

出　　处：《南京大学学报（自然科学版）》2018年第6期1095-1104,共10页Journal of Nanjing University（Natural Science）

基　　金：江苏省水利科技项目重大技术攻关项目(2017010);国家自然科学基金(41472241);中央高校基本科研业务费(2016B05914,2017B666X14);江苏省研究生科研创新计划(KYCX17_0502)

摘　　要：对河道岸坡坡面稳定性问题,采用聚氨酯型生态稳定剂对边坡表层砂土进行改良,通过室内试验对改良砂土强度特性、水稳定性与抗冲刷能力进行研究,并结合扫描电镜对稳定剂改良砂土的机理进行了深入分析.试验结果表明:稳定剂浓度与砂土干密度对改良砂土强度特性、水稳定性与抗冲刷能力有显著影响.(1)随着稳定剂浓度的增加,改良砂土的强度特性,水稳定性与抗冲刷能力逐渐增强,特别是对于砂土抗拉强度与水稳定性能的改善.(2)随干密度增加,改良砂土的峰值强度与残余强度、剪切强度以及水稳定性能增强;而改良砂土的抗拉强度在1.5g·cm^-3时最大,1.4g·cm^-3的次之,1.6g·cm^-3的最小.(3)稳定剂溶液与水反应生成的固化膜缠绕包裹砂粒,填充砂土空隙,在砂土中形成一种稳定的结构,很好地增强了砂粒间的粘结力,减小砂土空隙,进而改良砂土的工程性质.The sand on the surface of river slope is easy to erosion because it is weak in its strength,water stability and erosion resistance.In order to evaluate the effectiveness of polyurethane soil stabilizers as a kind of soil stabilizer used in slope surface protection in river slope,a series of laboratory tests were carried out to stabilizer reinforced sand.Additionally,the reinforcement mechanism was analyzed by tests results and scanning electron microscope. The results show that stabilizer concentration and dry density have significant effects on strength property, water-stability and erosion resistance of reinforced sand.The strength property,water-stability and erosion resistance of reinforced sand increased with the increasing of stabilizer concentration,especially for the improvement of the tensile strength and the water stability of reinforced sand.And the peak strength,residual strength,shear strength, water stability and of reinforced sand enhanced with the increase of dry density.However,the reinforced.specimen with density 1.50g·cm^-3had the highest value of tensile strength,the one with density 1.60g·cm^-3 had the lowest value,and the other one with density 1.40g·cm^-3had a middle value.The polymer membranes-formed by the mixture of polymer and water-enwrap the sand particles and interlink them to form a stable structure.The efficiency of this stabilization changed with dry sand density.

关 键 词：地质工程 河道岸坡 生态稳定剂 强度特性 水稳定性 抗冲刷能力 

分 类 号：TU43[建筑科学—岩土工程]