考虑荷载与浸水条件的预崩解炭质泥岩变形与强度试验
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摘要
预崩解炭质泥岩作为路堤填料已在我国西南地区路堤工程中广泛应用,为研究荷载与浸水条件下预崩解炭质泥岩变形与强度特性,研发一套可综合考虑多因素影响的湿化变形试验装置,并设计正交试验方案开展预崩解炭质泥岩湿化变形与直剪试验。结果表明:在加载初期和首次浸水时,预崩解炭质泥岩将产生较大竖向变形,分别为压缩变形和湿化变形,竖向荷载、循环次数、浸水时间、压实度、含水率对预崩解炭质泥岩竖向变形影响程度依次降低;预崩解炭质泥岩湿化变形过程中抗剪强度的变化主要源于黏聚力的变化,各因素对黏聚力的影响程度由强至弱依次为循环次数、浸水时间、竖向荷载、压实度及含水率;抗剪强度随竖向变形的增加先急剧降低后逐渐趋于稳定,拟合得到抗剪强度与竖向变形的函数关系式,可为炭质泥岩变形计算及工程实践提供一定参考依据。
Pre-disintegrating carbonaceous mudstone has been widely used in the embankment engineering as embankment filler in Southwest China. In order to study the deformation and strength characteristics of pre-disintegrating carbonaceous mudstone under loading and soaking condition, a new type of wetting deformation test device is developed. A series of deformation tests on pre-disintegrating carbon mudstone samples are carried out according to the orthogonal experimental design. The test results show that the pre-disintegrating carbon mudstone will exhibit a large vertical deformation at initial loading and first immersion, which consists of both compressive induced deformation and wetting induced deformation. The influences of vertical load, cycle number,immersion time, compactness and moisture content on the maximum vertical deformation of pre-disintegrating carbon mudstone decrease in sequence. The variation of shear strength during wetting deformation is mainly due to the change of cohesion. The influence level of cycle number, immersion time, vertical load, compactness and moisture content on cohesive strength of pre-disintegrating carbon mudstone decreases accordingly. The shear strength decreases sharply first and then tends to be stable with the increase of the vertical deformation. The function relation between shear strength and vertical deformation is obtained. The results can provide some references for deformation calculation and engineering practice of carbonaceous mudstone.
Pre-disintegrating carbonaceous mudstone has been widely used in the embankment engineering as embankment filler in Southwest China. In order to study the deformation and strength characteristics of pre-disintegrating carbonaceous mudstone under loading and soaking condition, a new type of wetting deformation test device is developed. A series of deformation tests on pre-disintegrating carbon mudstone samples are carried out according to the orthogonal experimental design. The test results show that the pre-disintegrating carbon mudstone will exhibit a large vertical deformation at initial loading and first immersion, which consists of both compressive induced deformation and wetting induced deformation. The influences of vertical load, cycle number,immersion time, compactness and moisture content on the maximum vertical deformation of pre-disintegrating carbon mudstone decrease in sequence. The variation of shear strength during wetting deformation is mainly due to the change of cohesion. The influence level of cycle number, immersion time, vertical load, compactness and moisture content on cohesive strength of pre-disintegrating carbon mudstone decreases accordingly. The shear strength decreases sharply first and then tends to be stable with the increase of the vertical deformation. The function relation between shear strength and vertical deformation is obtained. The results can provide some references for deformation calculation and engineering practice of carbonaceous mudstone.
引文
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[18]李新明,孔令伟,郭爱国,等.基于工程包边法的膨胀土抗剪强度干湿循环效应试验研究[J].岩土力学,2014,35(3):675-682.LI Xin-ming,KONG Ling-wei,GUO Ai-guo,et al.Experimental research on shear strength of expansive soil under wetting-drying cycles based on wrapping method[J].Rock and Soil Mechanics,2014,35(3):675-682.
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[2]曾铃,付宏渊,贺炜,等.三轴CT条件下预崩解炭质泥岩路堤填料的细观试验[J].中南大学学报(自然科学版),2014,45(3):925-931.ZENG Ling,FU Hong-yuan,HE Wei,et al.Micro mechanical analysis of pre-disintegrating carbonaceous mudstone for embankment filling material based on triaxial CT test[J].Journal of Central South University(Science and Technology),2014,45(3):925-931.
[3]BRUNETTI A,MAZZANTI P.Monitoring an unstable road embankment for public safety purposes by terrestrial SAR interferometry[C]//International Symposyum on Field Measurements in Geomechanics.[S.l.]:[s.n.],2015.
[4]邓华锋,肖瑶,方景成,等.干湿循环作用下岸坡消落带土体抗剪强度劣化规律及其对岸坡稳定性影响研究[J].岩土力学,2017,38(9):2629-2638.DENG Hua-feng,XIAO Yao,FANG Jing-cheng,et al.Shear strength degradation and slope stability of soils at hydro-fluctuation belt of river bank slope during drying-wetting cycle[J].Rock and Soil Mechanics,2017,38(9):2629-2638.
[5]LU N,WAYLLACE A,OH S.Infiltration-induced seasonally reactivated instability of a highway embankment near the Eisenhower Tunnel,Colorado,USA[J].Engineering Geology,2013,162(14):22-32.
[6]邹德高,杨小龙,刘京茂,等.西域砾岩砂砾料沥青混凝土心墙坝湿化变形数值分析[J].大连理工大学学报,2015,55(6):605-611.ZOU De-gao,YANG Xiao-long,LIU Jing-mao,et al.Numerical analysis of wetting-induced deformation of Xiyu conglomerate gravel dam with asphalt concrete cpre[J].Journal of Dalian University of Technology,2015,55(6):605-611.
[7]毛雪松,郑小忠,马骉,等.风化千枚岩填筑路基湿化变形现场试验分析[J].岩土力学,2011,32(8):2300-2306.MAO Xue-song,ZHENG Xiao-zhong,MA Biao,et al.Field experimental analysis of wetting deformation of filled subgrade with weathered phyllite[J].Rock and Soil Mechanics,2011,32(8):2300-2306.
[8]LIU X,QI D,YU Y,et al.Analysis on wetting deformation properties of silty clay[J].Journal of Engineering Science&Technology Review,2014,7(3):39-44.
[9]WANG L L,BORNERT M,HéRIPRéE,et al.Irreversible deformation and damage in argillaceous rocks induced by wetting/drying[J].Journal of Applied Geophysics,2014,107(5):108-118.
[10]吴珺华,袁俊平.干湿循环下膨胀土现场大型剪切试验研究[J].岩土工程学报,2013,35(增刊1):103-107.WU Jun-hua,YUAN Jun-ping.Field tests on expansive soil during wetting-drying cycles using large shear apparatus[J].Chinese Journal of Geotechnical Engineering,2013,35(Suppl.1):103-107.
[11]ULUSAY R,KARAKUL H.Assessment of basic friction angles of various rock types from Turkey under dry,wet and submerged conditions and some considerations on tilt testing[J].Bulletin of Engineering Geology&the Environment,2015,28(4):1-17.
[12]杨和平,唐咸远,王兴正,等.有荷干湿循环条件下不同膨胀土抗剪强度基本特性[J].岩土力学,2018,39(7):2311-2317.YANG He-ping,TANG Xian-yuan,WANG Xing-zheng,et al.Shear strength of expansive soils under wet-dry cycles with loading[J].Rock and Soil Mechanics,2018,39(7):2311-2317.
[13]王江营,曹文贵,张超,等.基于正交设计的复杂环境下土石混填体大型直剪试验研究[J].岩土工程学报,2013,35(10):1849-1856.WANG Jiang-ying,CAO Wen-gui,ZHANG Chao,et al.Large-scale direct shear tests on soil-rock aggregate mixture under complicated environment based on orthogonal design[J].Chinese Journal of Geotechnical Engineering,2013,35(10):1849-1856.
[14]ZHANG B Y,ZHANG J H,SUN G L.Deformation and shear strength of rockfill materials composed of soft siltstones subjected to stress,cyclical drying/wetting and temperature variations[J].Engineering Geology,2015,190:87-97.
[15]刘翔,陈国兴,孙田.花岗岩全风化土湿化变形及强度的试验研究[J].岩土力学,2012,33(11):3313-3317.LIU Xiang,CHEN Guo-xing,SUN Tian.Experimental research on wetting deformation and strength of weathered granite[J].Rock and Soil Mechanics,2012,33(11):3313-3317.
[16]涂义亮,钟祖良,刘新荣,等.干湿循环下粉质黏土强度及变形特性试验研究[J].岩土力学,2017,38(12):1001-1009.TU Yi-liang,ZHONG Zu-liang,LIU Xin-rong,et al.Experimental study on the strength and deformation characteristics of silty clay during the wetting-drying cycles[J].Rock and Soil Mechanics,2017,38(12):1001-1009.
[17]中华人民共和国交通部.JTG E40-2007公路土工试验规程[S].北京:人民交通出版社,2007.Ministry of Transport of the People’s Republic of China.JTG E40-2007 Test methods of soils for highway engineering[S].Beijing:China Communications Press,2007.
[18]李新明,孔令伟,郭爱国,等.基于工程包边法的膨胀土抗剪强度干湿循环效应试验研究[J].岩土力学,2014,35(3):675-682.LI Xin-ming,KONG Ling-wei,GUO Ai-guo,et al.Experimental research on shear strength of expansive soil under wetting-drying cycles based on wrapping method[J].Rock and Soil Mechanics,2014,35(3):675-682.
[19]SUN M Q,WANG Q,NIU C C,et al.Research on the one-dimensional rheological consolidation theory that considers secondary consolidation effect[J].Journal of Computational and Theoretical Nanoscience,2016,13(2):1136-1146.
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