摘要
为深入了解黄麻纤维加筋崩岗岩土在增强崩岗抗压强度和提高其稳定性的作用机理,采用两因素随机区组设计试验研究了筋土复合体的应力-应变及无侧限抗压强度特性,探讨了黄麻纤维不同数量、不同分布方式下的筋土抗压强度。结果表明:崩岗的四层土体分别具有不同的最优加筋条件,即黄麻纤维数量和分布方式不同,且四层土体最优加筋条件下的无侧限抗压强度分别较未加筋土样提高7.97%、19.24%、15.35%、42.88%。最优加筋条件下淀粉处理黄麻纤维的研究表明:纤维经过淀粉处理养护不同时间后,四层筋土复合体的抗压强度与养护时间达到了显著相关,分别在养护时间的7、7、5、3d后达到最大,分别提高14.45%、15.07%、8.90%、8.07%。崩岗侵蚀预防和治理时分层修复的新思路将为崩岗区侵蚀防治工作的开展提供重要的科学依据。
【Objective】Collapsing hill is a phenomenon of slope erosion of soil or weathered rocks,collapsing and accumulating at the foot of the hill under hydraulic and gravity actions.Its harm is great in degree and hard to control.Fiber reinforcement is a new type of soil improvement technology to improve mechanical properties of the soil by amending a certain amount of fiber or fiber mesh into the soil evenly.It has,in recent years,been attracting much interest of scholars in conducting researches and experiments.But so far little has been reported on unconfined compressive strength of jute-fiber-fortified collapsing hill soil.Therefore,in this study experiments were carried out to explore mechanism of amending jute fiber into collapsing hill soil enhancing compressive strength and stability of the soil composite.【Method】 In this study,the experiment was laid out in two-factor randomized block design and carried out to characterize stress-strain and unconfined compressive strength of the jute fiber-fortified collapsing hill soil composite.In the experiment,unconfined compressive strength of the composite was investigated relative to quanty and distribution of the jute fiber amended in four layers of the soil composite,i.e..Eluvial layer A,Argic layer Bt,Deposition layer B and Parent material layer C.【Result】 It was found that optimal reinforcement conditions（quanty and distribution） varied with the soil layer.For Eluvial layer A,jute fiber should be applied at 1 and distributed vertically; for Argic layer Bt,applied at 3 and blended evently; for Deposition layer B,applied at 1 and distributed horizontally; and for Parent material layer C,applied at 5 and distributed is horizontally,thus improving the unconfined compressive strength of the four layers by 7.97%,19.24%,15.35% and 42.88%,respectively,as compared with the unfortified soil.When starch was amended to jute fiber in the experiment,it took some time to cure the composite.And it was found that unconfined compressive strength of the four-layers was
作者
杨彩迪
卫杰
张晓明
黄新梁
周春辉
牛玉华
YANG Caidi;WEI Jie;ZHANG Xiaoming;HUANG Xinliang;ZHOU Chunhui;NIU Yuhua(College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China;Key Laboratory of Arable Land Conservation,Middle and Lower Reaches of Yangtze River of Ministry of Agriculture,Wuhan 430070,China)
出处
《土壤学报》
CAS
CSCD
北大核心
2018年第4期923-932,共10页
Acta Pedologica Sinica
基金
国家自然科学基金项目(41771307
41201271)
华中农业大学"国家级大学生创新创业训练计划"项目(105042016015)
华中农业大学"大学生科技创新基金"项目(SRF)"(2016076)资助~~
关键词
崩岗
筋土复合体
黄麻纤维
无侧限抗压强度
淀粉处理
Collapsing hill
Jute fiber-fortified collapsing hill soil composite
Jute fiber
Unconfined compressive strength
Treatment of starch
