木质素磺酸盐+聚丙烯纤维路基分散性土性能复合改良研究  

Study on Composite Improvement of Subgrade Dispersive Soil Based on Lignosulfonate and Polypropylene Fiber

作　　者：卢永 李剑波 庄宝利 苏龙 吴腾 LU Yong;LI Jianbo;ZHUANG Baoli;SU Long;WU Teng(Hunan Lianzhi Technology Co. ,Ltd. , Changsha, Hunan 410203,China;Hunan Communications Research Institute Co., Ltd., Changsha, Hunan 410015,China)

机构地区：[1]湖南联智科技股份有限公司,湖南长沙410203 [2]湖南省交通科学研究院有限公司,湖南长沙410015

出　　处：《公路工程》2022年第3期118-124,共7页Highway Engineering

基　　金：湖南省交通科技项目(201742);湖南省交通科技项目(201811)。

摘　　要：为研究木质素磺酸盐+聚丙烯纤维复合改良分散性土的物理力学性质,针对某公路路基分散性土,尝试以木质素磺酸盐+聚丙烯纤维作为复合改良材料,开展一系列关于改良土的针孔试验、UCS试验、抗剪强度试验,分析改良配比对最终流量、UCS、抗剪强度等指标的影响。结果表明,无论从效果还是从经济考虑,单独采用LS降低分散度都远强于单独采用PF;在所有改良土中,只有复合改良土的最终流量达到了非分散性土的要求,而采用2%LS+0.35%PF进行复合改良对于提升UCS是较为理想的;改良土和素土的CSL相互平行,前者的屈服面有所扩大,更难达到屈服。综合考虑抗侵蚀性和强度,采用LS+PF进行复合改良有一定必要性,研究成果为复合改良的应用推广提供了试验依据。In order to study the physical and mechanical properties of lignosulfonate+polypropylene fiber composite improved dispersive soil,aiming at a highway subgrade dispersive soil,this paper attempted to use ligninsulfonate and polypropylene fiber as a composite improvement materials,and carried out a series of pinhole tests,UCS test and shear tests on improved soil.The influences of improvement ratio on dispersion degree,eventual flow,UCS were analyzed.The mechanism of the composite improvement was discussed from the micro perspective.The results show that using LS alone can reduce the dispersion more than using PF alone,both in terms of effect and economy.Among all the improved soil,only the composite improved soil can meet the requirements of non-dispersed soil erosion flow,and the composite improved soil using 2%LS+0.35%PF is ideal for improving UCS.The CSL of the improved soil and the plain soil are parallel to each other,and the yield surface of the former is enlarged,which makes it more difficult to yield.Considering erosion resistance and strength,it is necessary to use LS+PF for composite improvement.This paper provides experimental basis for the application and popularization of composite improvement.

关 键 词：路基 分散性土 木质素 聚丙烯纤维 无侧限抗压强度 抗剪强度 

分 类 号：U416.1[交通运输工程—道路与铁道工程]