摘要
为了研究聚丙烯纤维掺量对水泥土强度增长机理的影响,分别进行了不同聚丙烯纤维掺量下的水泥土无侧限抗压强度试验、劈裂抗拉强度试验和电镜扫描试验,得到了聚丙烯纤维水泥土无侧限抗压强度、劈裂抗拉强度的变化规律,分析了能量演化特征和内部微观结构。试验结果表明:随着聚丙烯纤维掺量的增加,水泥土的无侧限抗压强度、劈裂抗拉强度和强度增益比均呈现先增大后减小的趋势,且离散程度整体较小。当聚丙烯纤维掺量为0.4%时,无侧限抗压强度和劈裂抗拉强度达到最大值,分别为4.18 MPa和0.74 MPa,比素水泥土分别提高了13.28%和23.33%,强度增益比大于1;无侧限抗压强度试验和劈裂抗拉强度试验中,总能量、弹性应变能均达到最大值,分别为0.0721 MJ/m^3、0.0637 MJ/m^3和0.00404 MJ/m^3、0.00337 MJ/m^3。耗散能在无侧限抗压强度试验中整体上呈现下降趋势,而在劈裂抗拉强度试验中却呈现先减小后增大的趋势。
In order to study the effect of polypropylene fiber content on the strength growth mechanism of cement soil,unconfined compressive strength test,splitting tensile strength test and electron microscopy scanning experiments of cement soil under different polypropylene fiber content were carried out.Electron microscopy scanning experiments were carried out to obtain the unconfined compressive strength and splitting tensile strength of polypropylene fiber cement soil,and the energy evolution characteristics and internal microscopic pore fractals were analyzed.The results show that the unconfined compressive strength,splitting tensile strength and strength gain ratio of cemented soil increase first and then decrease with the increase of polypropylene fiber content,and the dispersion degree is small as a whole.When the content of polypropylene fiber is 0.4%,the unconfined compressive strength and splitting tensile strength reach the maximum,which are 4.18 MPa and 0.74 MPa,respectively,13.28%and 23.33%higher than that of plain cement soil,and the strength gain ratio is greater than 1.The maximum values of total energy and elastic strain energy were 0.0721 MJ/m^3,0.0637 MJ/m^3 and 0.00404 MJ/m^3,0.00337 MJ/m^3 respectively.In unconfined compressive strength test,the dissipation energy decreases on the whole,while it decreases first and then increases in splitting tensile strength test.
作者
刘永翔
张经双
段雪雷
LIU Yongxiang;ZHANG Jingshuang;DUAN Xuelei(School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui 232001, China;Engineering Research Center of Underground Mine Construction, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China)
出处
《中国科技论文》
CAS
北大核心
2020年第6期622-627,共6页
China Sciencepaper
关键词
聚丙烯纤维
水泥土
无侧限抗压强度
劈裂抗拉强度
能量演化
polypropylene fiber
cement soil
unconfined compressive strength
splitting tensile strength
energy evolution
