聚丙烯纤维-水泥基稳定土抗剪强度试验研究  

Experimental Study on Shear Strength of Polypropylene Fiber-cement Based Stabilized Soil

作　　者：刘华勇 钱涛 刘聪[2] 黄文广 余登峰 LIU Huayong;QIAN Tao;LIU Con;HUANG Wenguang;YU Dengfeng(Chinese People s Liberation Army 94968 Troops,Nanjing 210000,China;Faculty of Aerospace Engineering,Air Force Engineering University,Xi'an 710038,China;Institute of Special Service,Air Force Research Institute,Beijing 100195,China;School of Civil Engineering,Jiaying University,Meizhou 514015,Guangdong,China)

机构地区：[1]中国人民解放军94968部队 [2]空军工程大学航空工程学院 [3]空军研究院特种勤务研究所 [4]嘉应学院土木工程学院

出　　处：《路基工程》2018年第2期87-90,共4页Subgrade Engineering

基　　金：国家自然科学基金资助(51708550)

摘　　要：为了分析聚丙烯纤维物理加筋和水泥化学加固作用对土体抗剪强度的影响,通过直接剪切试验,研究了不同纤维、水泥和河砂掺量对纤维-水泥基稳定土试样抗剪强度指标的影响规律。结果表明:(1)试样的剪应力与剪切位移关系曲线呈非线性关系,试样的抗剪强度与法向应力成正比关系;(2)随着水泥和纤维掺量的增加,试样的黏聚力和内摩擦角不断增大,并且大致呈线性增长趋势;(3)随着含砂量的增加,纤维-水泥基稳定土试样的黏聚力大致呈现先增加后降低的趋势,最大值出现在含砂率为4%时,这表明在纤维-水泥基稳定土中,掺加适量的砂不仅不会降低试样的黏聚力,反而对黏聚力提高有一定的帮助。In order to analyze the effect of polypropylene fiber physical reinforcement and cement chemical reinforcement on shear strength of soil,direct shear tests were carried out to study the effect of different fiber,cement and river sand content on shear strength index of fiber-cement based stabilized soil specimens.The test results show that:①the shear stress shear displacement relation curve of the specimen has a nonlinear relationship and the shear strength of the specimen is in direct proportion to the normal stress;②with the increase of cement and fiber content,the cohesive and the internal friction angle of the specimen are increasing and the trend is linearly increasing;③with the increase of sand content,the cohesive of the fiber-cement based stabilized soil specimen increases first and then decreases and the maximum value occurs when the sand content is 4%,which indicates that adding a proper amount of sand will not decrease the cohesive force of the soil but will help to improve the cohesive.

关 键 词：纤维-水泥基稳定土 抗剪强度 直接剪切试验 内摩擦角 黏聚力 掺砂量 

分 类 号：TU459.1[建筑科学—岩土工程]