百色饱和膨胀土静止侧压力系数试验
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摘要
为了得到饱和膨胀土在不同干密度下的静止侧压力系数,针对以往静止侧压力系数研究中存在的问题,采用改进的试验装置和试验方法,通过调节环刀开合来消除由制样产生的初始水平应力,采用特制护刀避免试样在压缩过程中的有效传力面积减小。对广西百色地区膨胀土分别进行了饱和状态下是否消去初始水平应力、是否改变试样有效传力面积的静止侧压力系数对比试验。研究结果表明,制样产生的初始水平应力会使饱和膨胀土在相同干密度下的静止侧压力系数减小7.3%～19.9%;因压缩造成的有效传力面积减小会使饱和膨胀土在相同干密度下的静止侧压力系数减小2.3%～15.1%;饱和膨胀土静止侧压力系数随干密度的增加而减小;建立了饱和膨胀土K0-ρd曲线的拟合公式,得到了对应于不同荷载下饱和膨胀土的K0系数。
In order to observe the coefficient of lateral earth pressure at rest of saturated expansive soil at different dry density,an improved testing device and method was used to avoid the influence of initial horizontal stress due to specimen preparation by adjusting the opening and closing degree of the ring knife and the reduction of effective area due to the compression of the specimen by using special knife.The compared tests of expansive soil form Baise in Guangxi were carried out,including with and without initial horizontal stress and variation of effective area.The results show that the initial horizontal stress due to specimen preparation can occur 7.3%～19.9% decrease in the coefficient of lateral earth pressure at rest under the same dry density,and the reduction of effective area can occur 2.3%～15.1% decrease in it under the same dry density.The coefficient of lateral earth pressure at rest of saturated expansive soil decreases as the dry density increases.The K0 of saturated expansive soil under different upper load can be obtained by the fitting formula of K0-ρd.
In order to observe the coefficient of lateral earth pressure at rest of saturated expansive soil at different dry density,an improved testing device and method was used to avoid the influence of initial horizontal stress due to specimen preparation by adjusting the opening and closing degree of the ring knife and the reduction of effective area due to the compression of the specimen by using special knife.The compared tests of expansive soil form Baise in Guangxi were carried out,including with and without initial horizontal stress and variation of effective area.The results show that the initial horizontal stress due to specimen preparation can occur 7.3%～19.9% decrease in the coefficient of lateral earth pressure at rest under the same dry density,and the reduction of effective area can occur 2.3%～15.1% decrease in it under the same dry density.The coefficient of lateral earth pressure at rest of saturated expansive soil decreases as the dry density increases.The K0 of saturated expansive soil under different upper load can be obtained by the fitting formula of K0-ρd.
引文
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[14] Jaky I.The coefficient of earth pressure at rest[J].Journal of the Society of Hungarian Architects and Engineers,1944,78(22):355-358.
[15]张锐,刘正楠,郑健龙,等.膨胀土侧向膨胀力及其对重力式挡墙的作用[J].中国公路学报,2018,31(2):171-180.ZHANG Rui,LIU Zheng-nan,ZHENG Jian-long,et al.Lateral swelling pressure of expansive soil and its effect on gravity retaining wall[J].China Journal of Highway and Transport,2018,31(2):171-180.
[2]杨果林,滕珂,秦朝辉.膨胀土侧向膨胀力原位试验研究[J].中南大学学报:自然科学版,2014,45(7):2326-2332.YANG Guo-lin,TENG Ke,QIN Zhao-hui.An in-situ experimental research of lateral swelling pressure on expansive soils[J].Journal of Central South University:Science and Technology,2014,45(7):2326-2332.
[3] Ikizler S B,Vekli M,Dogan E,et al.Prediction of swelling pressures of expansive soils using soft computing methods[J].Neural Computing and Applications,2014,24(2):473-485.
[4] Abbas M F,Elkady T Y,Al-Shamrani M A.Evaluation of strain and stress states of a compacted highly expansive soil using a thin-walled oedometer[J].Engineering Geology,2015(193):132-145.
[5]陈存礼,贾亚军,金娟,等.含水率及应力对原状黄土静止侧压力系数的影响[J].岩石力学与工程学报,2017,36(S1):3535-3542.CHEN Cun-li,JIA Ya-jun,JIN Juan,et al.Influences of water content and stress on coefficient of lateral pressure at rest of undisturbed loess[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(S1):3535-3542.
[6]金松丽,赵卫全,张爱军,等.原状黄土增湿过程中的静止土压力系数变化规律试验研究[J].工程科学与技术,2017,49(5):63-70.JIN Song-li,ZHAO Wei-quan,ZHANG Ai-jun,et al.Experimental study of variation rules of the coe-fficient of earth pressure at rest during wetting for original loess[J].Advanced Engineering Sciences,2017,49(5):63-70.
[7]朱俊高,蒋明杰,沈靠山,等.粗粒土静止侧压力系数试验[J].河海大学学报:自然科学版,2016,44(6):491-497.ZHU Jun-gao,JIANG Ming-jie,SHEN Kao-shan,et al.Experimental study of at-rest lateral pressure coefficient of coarse-grained soil[J].Journal of Hohai University:Natural Sciences,2016,44(6):491-497.
[8]姚晓亮,齐吉琳,余帆.冻土静止侧压力系数的试验研究[J].地下空间与工程学报,2011,7(6):1108-1113.YAO Xiao-liang,QI Ji-lin,YU Fan.The experimental study on coefficient of lateral earth pressure at rest for frozen soil[J].Chinese Journal of Underground Space and Engineering,2011,7(6):1108-1113.
[9]杨和平,章高峰,张锐,等.宁明非饱和膨胀土静止侧压力系数[J].长沙理工大学学报:自然科学版,2009,6(1):1-5,35.YANG He-ping,ZHANG Gao-feng,ZHANG Rui,et al.Lateral pressure coefficient of Ningming unsaturated expansive soil[J].Journal of Changsha University of Science and Technology:Natural Science,2009,6(1):1-5,35.
[10]黄博,胡俊清,廖先斌,等.原状饱和黏土静止土压力系数试验研究[J].岩石力学与工程学报,2013(S2):4056-4064.HUANG Bo,HU Jun-qing,LIAO Xian-bin,et al.Experimental studies of static earth pressure coefficient of undisturbed saturated clay[J].Chinese Journal of Rock Mechanics and Engineer-ing,2013(S2):4056-4064.
[11] Hayashi H,Yamazoe N,Mitachi T,et al.Coefficient of earth pressure at rest for normally and overconsolidated peat ground in Hokkaido area[J].Soils and Foundations,2012,52(2):299-311.
[12]储团结.扁铲侧胀试验测定静止侧压力系数的探讨[J].铁道工程学报,2015,32(11):1-4.CHU Tuan-jie.Discussion on the determination of static lateral pressure coefficient from flat dilatometer tests[J].Journal of Railway Engineering Society,2015,32(11):1-4.
[13]赵富军.天津地铁静止侧压力系数确定方法研究[J].铁道工程学报,2016,33(12):99-104.ZHAO Fu-jun.Research on the method of the determination of static lateral pressure coefficient in Tianjin metro[J].Journal of Railway Engineering Society,2016,33(12):99-104.
[14] Jaky I.The coefficient of earth pressure at rest[J].Journal of the Society of Hungarian Architects and Engineers,1944,78(22):355-358.
[15]张锐,刘正楠,郑健龙,等.膨胀土侧向膨胀力及其对重力式挡墙的作用[J].中国公路学报,2018,31(2):171-180.ZHANG Rui,LIU Zheng-nan,ZHENG Jian-long,et al.Lateral swelling pressure of expansive soil and its effect on gravity retaining wall[J].China Journal of Highway and Transport,2018,31(2):171-180.