摘要
通过击实试验、无侧限抗压试验,将加筋土与未加筋土的无侧限抗压强度、破坏时的轴向应变和正割模量相比较,研究了含水率对不同加筋条件下棕榈加筋土抗压强度和变形的影响,并从能量吸收能力角度说明含水率和加筋条件对加筋土强度和变形的影响。结果表明:增强土样抗压强度的适宜加筋率和筋材长度分别为0.5%和20mm;且土样在具有最优含水率的条件下,纤维增强效果最佳,在最优含水率附近纤维增强效果都成降低趋势;加筋土的能量吸收能力随加筋率、纤维长度、含水率的增加而增加;纤维的加入降低了土体的刚度。另外,土样的破坏形态由未加筋土单一剪切面的脆性破坏逐渐转变为加筋土多剪切面的塑性破坏。
Through compaction tests and unconfined compression tests,the unconfined compressive strength,axial strain and secant modulus of reinforced soil and unreinforced soil were compared.The influence of water content on the compressive strength and deformation of palm reinforced soil under different reinforcement conditions was studied.The influence of water content and reinforcement conditions on the strength and deformation of reinforced soil was explained from the angle of energy absorption capacity.The results show that the optimum reinforcement ratio and length of reinforcement are 0.5% and 20 mm respectively,and the effect of fiber reinforcement is the best when the soil sample has the optimum water content,and the effect of fiber reinforcement decreases near the optimum water content.The energy absorption capacity of reinforced soil increases with the increase of reinforcement ratio,fiber length,and water content,while the addition of fiber reduces the stiffness of soil.In addition, the failure mode of soil samples gradually changes from the single-shear-plane brittle failure of unreinforced soil to the multi-shear-plane plastic failure of reinforced soil.
作者
黄晓如
璩继立
HUANG Xiaoru;QU Jili(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《上海理工大学学报》
CAS
CSCD
北大核心
2019年第4期395-402,共8页
Journal of University of Shanghai For Science and Technology
关键词
棕榈纤维
黏性土
无侧限
强度
变形
能量吸收能力
palm fiber
clay
unconfined
strength
deformation
energy absorption capacity
作者简介
第一作者:黄晓如(1993-),女,硕士研究生.研究方向:岩土工程.E-mail:1533495368@qq.com;通信作者:璩继立(1964-),男,副教授.研究方向:岩土工程.E-mail:qujili@sina.com.
