摘要
通过一系列试验研究了棕丝改良黏性土的抗开裂特性和抗冲刷特性,并分析了棕丝含量对黏性土的改良效果.试验结果表明:棕丝是一种柔性纤维材料,将其加入黏性土中可有效减少土体中宽大裂隙的产生,但加入的棕丝纤维含量过多时,纤维易发生重叠,影响棕丝纤维与土颗粒之间的有效接触,降低土颗粒之间的相互作用力,使得土体产生加筋效应,表面出现细小裂纹;将棕丝纤维加入黏性土中后,棕丝纤维可均匀分散在土体中,纤维与纤维相互交织形成立体的空间结构,并与土颗粒形成团聚体,从而可提高土体的抗冲刷特性,但加入的棕丝纤维含量过多时,加筋效应产生的小裂隙反而给雨水入渗提供了引流通道,使得土体间的孔隙增加,土体的抗冲刷特性反之下降;当棕丝掺量为0.4%时,棕丝改良黏性土的抗开裂性能最优;当棕丝掺量为0.6%时,棕丝改良黏性土的抗冲刷性能最优.
The cracking resistance and scouring resistance of clayey soil improved by palm silk were studied through a series of tests,and the improvement effect of palm silk content on the clayey soil was analyzed.The test results show that palm silk is a kind of flexible fiber material,which can effectively reduce the generation of wide cracks in the clayey soil improved by palm soil.However,when the content of palm silk fiber is too much,the fibers are easy to overlap,which can affect the effective contact between the palm silk fibers and the soil particles,and reduce the interaction between the soil particles,resulting in the reinforcement effect of the soil and small cracks on the soil surface.After adding palm silk fiber into the clayey soil,palm silk fiber can disperse evenly in soil mass.Fibers interweave with each other to form three-dimensional spatial structure,and form aggregates with soil particles,so as to improve the anti-scouring characteristics of soil mass.However,when the content of palm silk fiber is too much,small cracks caused by reinforcement effect can provide drainage channels for rainwater infiltration,which increases the porosity of soil mass and reduces the anti-scouring property of soil mass.When the content of palm silk is 0.4%,the anti-cracking performance of clayey soil improved by palm silk is the best.When the content of palm silk is 0.6%,the anti-scouring property of clayey soil improved by palm silk is the best.
作者
赵宁宁
何承宗
冯玉晗
马柯
李明阳
齐梦瑶
ZHAO Ningning;HE Chengzong;FENG Yuhan;MA Ke;LI Mingyang;QI Mengyao(Zhejiang Huadong Engineering Consulting Co.Ltd.,Hangzhou 310000,China;Hohai University,Nanjing 211100,China)
出处
《河南科学》
2023年第4期476-485,共10页
Henan Science
基金
国家自然科学基金项目(41877212)
横向课题边坡厚层基材改良与植被生态防护关键技术研究(822030516)。
关键词
黏性土
棕丝
开裂试验
冲刷试验
机理分析
cohesive soil
palm silk
cracking test
scouring test
mechanism analysis
