应力状态对粗颗粒土静止侧压力系数影响试验研究
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摘要
土体静止侧压力系数K0随应力状态的变化规律对深入把握其力学性质非常重要。然而,由于适用于粗粒土K0试验仪器及方法较少,对粗粒土K0随应力状态变化规律的研究几乎是空白的。为研究加载和卸载过程中粗颗粒土静止侧压力系数K0随应力状态的变化规律,利用新近研制的大型K0试验仪对某砂卵砾石料和堆石料进行了不同应力状态下的K0试验。K0试验结果表明:颗粒形态、应力状态、级配都对粗粒土K0有一定影响,其中应力状态影响最为明显;加、卸载时粗粒土K0随竖向应力增大呈减小的趋势。通过对K0试验结果进行深入分析,提出了粗颗粒土在加载过程中K0与竖向应力的关系式,并进行了验证。在此式基础上,基于前人总结所得K0与OCR的关系式,总结了一个反映任意固结状态下粗颗粒土K0随应力状态变化的关系式。
The research on K0 behavior under different stress states is important in grasping the mechanical parameter of the soils.However, there are few apparatuses and methods applicable for measuring K0 of coarse grained soil, therefore, as for the K0 behavior of coarse grained soil in different stress states, the relevant researches are almost blank. For coarse grained, in order to study the transformation law of at-rest earth pressure coefficient(K0) during loading and unloading, a new large-size K0 test apparatus was developed and used to conduct a serial of K0 tests for sandy gravel and rockfill in different stress states. The results of K0 test show the particle morphology、stress state and grading all have certain effect on the value of K0 of coarse grained soil, and the effect of stress state is the most obvious. During loading or unloading, K0 of coarse grained soil will decrease with the increasing of vertical stress.Furthermore, based on the results, a description of the K0 considering effective vertical stress during loading is established and verified. Lastly, based on this description and the relation between K0 and over consolidation ration(OCR) developed by former researcher, an empirical equation is obtained, which can well describe the relationship between K0 and stress state under an arbitrary consolidation condition.
The research on K0 behavior under different stress states is important in grasping the mechanical parameter of the soils.However, there are few apparatuses and methods applicable for measuring K0 of coarse grained soil, therefore, as for the K0 behavior of coarse grained soil in different stress states, the relevant researches are almost blank. For coarse grained, in order to study the transformation law of at-rest earth pressure coefficient(K0) during loading and unloading, a new large-size K0 test apparatus was developed and used to conduct a serial of K0 tests for sandy gravel and rockfill in different stress states. The results of K0 test show the particle morphology、stress state and grading all have certain effect on the value of K0 of coarse grained soil, and the effect of stress state is the most obvious. During loading or unloading, K0 of coarse grained soil will decrease with the increasing of vertical stress.Furthermore, based on the results, a description of the K0 considering effective vertical stress during loading is established and verified. Lastly, based on this description and the relation between K0 and over consolidation ration(OCR) developed by former researcher, an empirical equation is obtained, which can well describe the relationship between K0 and stress state under an arbitrary consolidation condition.
引文
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[14]BROOKER E W,IRELAND H O.Earth pressure at rest related to the stress history[J].Canadian Geotechnical Journal,1965,2(4):1-15.
[15]纠永志,黄茂松.超固结软黏土的静止土压力系数与不排水抗剪强度[J].岩土力学,2017,38(4):951-957.JIU Yong-zhi,HUANG Mao-song.Coefficient of earth pressure at rest and undrained shear strength of overconsolidated soft clays[J].Rock and Soil Mechanics,2017,38(4):951-957.
[16]WANG J J,YANG Y,BAI J,et al.Coefficient of earth pressure at rest of a saturated artificially mixed soil from oedometer tests[J].Journal of Civil Engineering,2017(1):1-9.
[17]WANATOWSKI D W,CHU J C.K0 of sand measured by a plane-strain apparatus[J].Canadian Geotechnical Journal,2007,44(8):1006-1012.
[18]薄以霆.粗粒料休止角及强度特性试验研究[D].南京:河海大学2012.BO Yi-ting.Experiment study on angle of repose and strength characteristics of coarse aggregate[D].Nanjing:Hohai University,2012.
[2]SHOGAKI T,NOCHIKAWA Y.Triaxial strength properties of natural deposits at K0 consolidation state using a precision triaxial apparatus with small size specimens[J].Soils and Foundations,2004,44(2):41-52.
[3]WANATOWSKI D,CHU J.Drained behaviour of Changi sand in triaxial and plane-strain compression[J].Geomechanics&Geoengineering,2007,2(1):29-39.
[4]程海涛,刘保健,谢永利.压实黄土连续加载K0固结特性[J].岩石力学与工程学报,2007,26(增刊1):3203-3208.CHENG Hai-tao,LIU Bao-jian,XIE Yong-li.K0consolidation characteristics of compacted loess under continuous loading[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Suppl.1):3203-3208.
[5]WANATOWSKI D,CHU J.Stress-strain behavior of a granular fill measured by a new plane-strain apparatus[J].Geotechnical Testing Journal,2006,29(2):149-157.
[6]赵玉花,沈日庚,李青.软黏土侧压力系数K0阶段性特征研究[J].岩土力学,2008,29(5):1264-1268.ZHAO Yu-hua,SHEN Ri-geng,LI Qing.Research on staged characteristics of lateral pressure coefficient K0 of soft clay[J].Rock and Soil Mechanics,2008,29(5):1264-1268.
[7]MESRI G,VARDHANABHUTI B.Compression of granular materials[J].Canadian Geotechnical Journal,2009,46(4):369-392.
[8]LIRER S,FLORA A,NICOTERA M V.Some remarks on the coefficient of earth pressure at rest in compacted sandy gravel[J].Acta Geotechnica,2011,6(1):1-12.
[9]李国维,胡坚.超固结软黏土一维蠕变次固结系数与侧压力系数[J].岩土工程学报,2012,34(12):2198-2205.LI Guo-wei,HU Jian.One-dimensional secondary consolidation coefficient and lateral pressure coefficient of overconsolidated soft clay[J].Chinese Journal of Geotechnical Engineering,2012,34(12):2198-2205.
[10]MAYNE P W,KULHAWY F H.K0-OCR relationships in soil[J].Journal of the Geotechnical Engineering Division,1982,20(1):851-872.
[11]GAO Y,WANG Y H.Calibration of tactile pressure sensors for measuring stress in soils[J].Geotechnical Testing Journal,2013,36(4):1-7.
[12]LEE J,LEE D,PARK D.Experimental investigation on the coefficient of lateral earth pressure at rest of silty sands[J].Geotechnical Testing Journal,2014,37(6):967-979.
[13]GU X,HU J,HUANG M.K0 of granular soils:a particulate approach[J].Granular Matter,2015,17(6):703-715.
[14]BROOKER E W,IRELAND H O.Earth pressure at rest related to the stress history[J].Canadian Geotechnical Journal,1965,2(4):1-15.
[15]纠永志,黄茂松.超固结软黏土的静止土压力系数与不排水抗剪强度[J].岩土力学,2017,38(4):951-957.JIU Yong-zhi,HUANG Mao-song.Coefficient of earth pressure at rest and undrained shear strength of overconsolidated soft clays[J].Rock and Soil Mechanics,2017,38(4):951-957.
[16]WANG J J,YANG Y,BAI J,et al.Coefficient of earth pressure at rest of a saturated artificially mixed soil from oedometer tests[J].Journal of Civil Engineering,2017(1):1-9.
[17]WANATOWSKI D W,CHU J C.K0 of sand measured by a plane-strain apparatus[J].Canadian Geotechnical Journal,2007,44(8):1006-1012.
[18]薄以霆.粗粒料休止角及强度特性试验研究[D].南京:河海大学2012.BO Yi-ting.Experiment study on angle of repose and strength characteristics of coarse aggregate[D].Nanjing:Hohai University,2012.