巴东组软岩非饱和碎屑土夹层的长期强度
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摘要
巴东组软岩碎屑土夹层的非饱和蠕变特性明显、强度时间效应显著,研究其长期强度对含碎屑土夹层软岩路堑边坡稳定性分析有所帮助。为研究非饱和碎屑土夹层的长期强度问题,首先利用GDS非饱和三轴仪开展碎屑土夹层的非饱和强度、蠕变试验,得到其不同基质吸力下的应力-应变曲线、应变-时间曲线,分析基质吸力对其强度与蠕变特性的影响;其次基于碎屑土夹层的蠕变曲线,利用等时曲线法确定其不同基质吸力下的长期强度。结果表明碎屑土夹层的长期强度较瞬时强度大幅降低,强度产生折损,损失率在34%~62%之间。碎屑土夹层的基质吸力越小,其长期强度越小,强度损失率越大。即巴东组软岩碎屑土夹层的饱和度越高,其强度越小,在荷载长期作用下的强度损失越大,且强度损失率增加的幅度随饱和度的增高而不断增大。
The properties of creep and time dependent behaviours of strength of weak intercalated soils in soft rock of Badong formation are obvious. To study the long-term strength of weak intercalated soils can be useful for stability analysis of the cutting slopes with weak intercalated soils. In order to study the long-term strength of the weak intercalated soils,the strength and creep tests of weak intercalated soils are carried out with a GDS unsaturated triaxial apparatus. It is to find out the effects of matrix suction on strength and creep characteristics of weak intercalated soils from the stress-strain and strain-time curves. Then the isochronous curves method is used to determine the long-term strength of weak intercalated soils based on the creep curves. The results show that the long-term strength of weak intercalated soils is reduced greatly in comparison with the instantaneous strength. The loss rate of strength is between 34% and 62%.The smaller the matrix suction is,the smaller the long-term strength and the greater the loss rate of strength can be. That is to say for the weak intercalated soils of soft rock of Badong formation,the higher the saturability is,the smaller the strength is and the greater the loss rate of strength is. Theincreasing range of loss rate of strength can increase with the increasing of saturability of weak intercalated soils.
The properties of creep and time dependent behaviours of strength of weak intercalated soils in soft rock of Badong formation are obvious. To study the long-term strength of weak intercalated soils can be useful for stability analysis of the cutting slopes with weak intercalated soils. In order to study the long-term strength of the weak intercalated soils,the strength and creep tests of weak intercalated soils are carried out with a GDS unsaturated triaxial apparatus. It is to find out the effects of matrix suction on strength and creep characteristics of weak intercalated soils from the stress-strain and strain-time curves. Then the isochronous curves method is used to determine the long-term strength of weak intercalated soils based on the creep curves. The results show that the long-term strength of weak intercalated soils is reduced greatly in comparison with the instantaneous strength. The loss rate of strength is between 34% and 62%.The smaller the matrix suction is,the smaller the long-term strength and the greater the loss rate of strength can be. That is to say for the weak intercalated soils of soft rock of Badong formation,the higher the saturability is,the smaller the strength is and the greater the loss rate of strength is. Theincreasing range of loss rate of strength can increase with the increasing of saturability of weak intercalated soils.
引文
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Cheng Q,Zhou D P,Feng Z J.2009.Research on shear creep property of typical weak intercalation in redbed soft rock[J].Chinese Journal of Rock Mechanics and Engineering,28(S1):3176~3180.
Ding X L,Fu J,Liu J,et al.2005.Study on creep behavior of alternatively distributed soft and hard rock layers and slope stability analysis[J].Chinese Journal of Rock Mechanics and Engineering,24(19):3410~3418.
Li K R,Kang W F.1983.Creep testing of thin interbedded clayey seamsin rock and determination of their longterm strength[J].Rock and Soil Mechanics,4(1):39~45.
Li L.2013.Study on three-dimensional rheological constitutive andlongterm strength of Q3undisturbed-loess in ground fissure zone[Thesis of master][D].Xi'an:Chang'an University.
Liu J H,Wang S C,Yang H M.1996.Method to determine the rheologicail test long-term strength for soft intercalations[J].Site Investigation Science and Technology,(5):3~7.
Ovanesova A V,Suarez L E.2004.Application of wavelet trans-forms to damage detection in frame structure[J].Engineering Structures,26(1):39~49.
Sun J.1999.Rheology of geomaterials and its engineering application[M].Beijing:China Architecture and Building Press.
Tan T K,Kang W F.1991.On the locked in stress,creep and dilatation of rocks,and the constitutive equations[J].Chinese Journal of Rock Mechanics and Engineering,(4):299~312.
Tan T K.1982.The mechanical problems for the long-term stability of underground galleries[J].Chinese Journal of Rock Mechanics and Engineering,1(1):1~20.
Wan L,Peng X H.Yang C H,et al.2005.An investigation to the creep of claystone[J].Rock and Soil Mechanics,26(6):924~928.
Wang Z J,Yin K L,Jian W X.2007.Experimental research on creep of incompetent beds in Jurassic red clastic rocks in Wanzhou[J].Rock and Soil Mechanics,28(S1):40~44.
Xu H,Xiao H B,Teng K.2011.Experimental study on direct shear creep characteristics and long-term strength for Nanning expansive soil[J].Highway Engineering,36(1):31~35.
Yang T H,Rui Y Q,Zhu W C,et al.2008.Rheological characteristics and long-term strenth of siltized intercalation interbeded in peat mudstone[J].Journal of Experimental Mechanics,23(5):396~402.
Zhang Q H,Peng G Z.1997.Research on creep behavior of the week intercalated bedin the dangerous rock body of lianzi cliff[J].Rock and Soil Mechanics,18(1):60~64.
Zhu C Q,Guo J Y.1990.The farther study for the rhedogical behavior of clay soil and the new determination method of long-term Strength[J].Rock and Soil Mechanics,11(2):15~21.
Zhu D H,Chen G X.2002.Experimental study of Nanjing red-bed on rheology[J].Journal of Nanjing University of Technology(Natural Science),24(5):77~79.
Zhu Y B.2014.Research on the unsaturated characteristics of weak intercalation in soft rock of Badong Formation in Yichang-Badon Highway[Doctorate Thesis][D].Wuhan:China University o Geosciences.
陈渠,西田和范,岩本健,等.2003.沉积软岩的三轴蠕变实验研究及分析评价[J].岩石力学与工程学报,22(6):905~912.
陈宗基,康文法.1991.岩石的封闭应力、蠕变和扩容及本构方程[J].岩石力学与工程学报,(4):299~312.
陈宗基.1982.地下巷道长期稳定性的力学问题[J].岩石力学与工程学,1(1):1~20.
程强,周德培,封志军.2009.典型红层软岩软弱夹层剪切蠕变性质研究[J].岩石力学与工程学报,28(S1):3176~3180.
丁秀丽,付敬,刘建,等.2005.软硬互层边坡岩体的蠕变特性研究及稳定性分析[J].岩石力学与工程学报,24(19):3410-3418.
黎克日,康文法.1983.岩体中泥化夹层的流变试验及其长期强度的确定[J].岩土力学,4(1):39~45.
李丽.2013.地裂缝带Q3原状黄土三维流变本构及长期强度研究[硕士学位论文][D].西安:长安大学.
刘晶辉,王山长,杨洪海.1996.软弱夹层流变试验长期强度确定方法[J].勘察科学技术,(5):3~7.
孙钧.1999.岩土材料流变及工程应用[M].北京:中国建筑工业出版社.
万玲,彭向和,杨春和,等.2005.泥岩蠕变行为的实验研究及其描述[J].岩土力学,26(6):924~928.
王志俭,殷坤龙,简文星.2007.万州区红层软弱夹层蠕变试验研究[J].岩土力学,28(S1):40~44.
许豪,肖宏彬,滕珂.2011.南宁膨胀土直剪蠕变特性及长期强度试验研究[J].公路工程,36(1):31~35.
杨天鸿,芮勇勤,朱万成,等.2008.炭质泥岩泥化夹层的流变特性及长期强度[J].实验力学,23(5):396~402.
张奇华,彭光忠.1997.链子崖危岩体软弱夹层的蠕变性质研究[J]岩土力学,18(1):60~64.
朱长歧,郭见杨.1990.黏土流变特性再认识及确定长期强度的新方法[J].岩土力学,11(2):15~21.
朱定华,陈国兴.2002.南京红层软岩流变特性试验研究[J].南京工业大学学报(自然科学版),24(5):77~79.
祝艳波.2014.宜巴高速公路巴东组软岩碎屑土夹层的非饱和特性研究[博士学位论文][D].武汉:中国地质大学.
Cheng Q,Zhou D P,Feng Z J.2009.Research on shear creep property of typical weak intercalation in redbed soft rock[J].Chinese Journal of Rock Mechanics and Engineering,28(S1):3176~3180.
Ding X L,Fu J,Liu J,et al.2005.Study on creep behavior of alternatively distributed soft and hard rock layers and slope stability analysis[J].Chinese Journal of Rock Mechanics and Engineering,24(19):3410~3418.
Li K R,Kang W F.1983.Creep testing of thin interbedded clayey seamsin rock and determination of their longterm strength[J].Rock and Soil Mechanics,4(1):39~45.
Li L.2013.Study on three-dimensional rheological constitutive andlongterm strength of Q3undisturbed-loess in ground fissure zone[Thesis of master][D].Xi'an:Chang'an University.
Liu J H,Wang S C,Yang H M.1996.Method to determine the rheologicail test long-term strength for soft intercalations[J].Site Investigation Science and Technology,(5):3~7.
Ovanesova A V,Suarez L E.2004.Application of wavelet trans-forms to damage detection in frame structure[J].Engineering Structures,26(1):39~49.
Sun J.1999.Rheology of geomaterials and its engineering application[M].Beijing:China Architecture and Building Press.
Tan T K,Kang W F.1991.On the locked in stress,creep and dilatation of rocks,and the constitutive equations[J].Chinese Journal of Rock Mechanics and Engineering,(4):299~312.
Tan T K.1982.The mechanical problems for the long-term stability of underground galleries[J].Chinese Journal of Rock Mechanics and Engineering,1(1):1~20.
Wan L,Peng X H.Yang C H,et al.2005.An investigation to the creep of claystone[J].Rock and Soil Mechanics,26(6):924~928.
Wang Z J,Yin K L,Jian W X.2007.Experimental research on creep of incompetent beds in Jurassic red clastic rocks in Wanzhou[J].Rock and Soil Mechanics,28(S1):40~44.
Xu H,Xiao H B,Teng K.2011.Experimental study on direct shear creep characteristics and long-term strength for Nanning expansive soil[J].Highway Engineering,36(1):31~35.
Yang T H,Rui Y Q,Zhu W C,et al.2008.Rheological characteristics and long-term strenth of siltized intercalation interbeded in peat mudstone[J].Journal of Experimental Mechanics,23(5):396~402.
Zhang Q H,Peng G Z.1997.Research on creep behavior of the week intercalated bedin the dangerous rock body of lianzi cliff[J].Rock and Soil Mechanics,18(1):60~64.
Zhu C Q,Guo J Y.1990.The farther study for the rhedogical behavior of clay soil and the new determination method of long-term Strength[J].Rock and Soil Mechanics,11(2):15~21.
Zhu D H,Chen G X.2002.Experimental study of Nanjing red-bed on rheology[J].Journal of Nanjing University of Technology(Natural Science),24(5):77~79.
Zhu Y B.2014.Research on the unsaturated characteristics of weak intercalation in soft rock of Badong Formation in Yichang-Badon Highway[Doctorate Thesis][D].Wuhan:China University o Geosciences.
陈渠,西田和范,岩本健,等.2003.沉积软岩的三轴蠕变实验研究及分析评价[J].岩石力学与工程学报,22(6):905~912.
陈宗基,康文法.1991.岩石的封闭应力、蠕变和扩容及本构方程[J].岩石力学与工程学报,(4):299~312.
陈宗基.1982.地下巷道长期稳定性的力学问题[J].岩石力学与工程学,1(1):1~20.
程强,周德培,封志军.2009.典型红层软岩软弱夹层剪切蠕变性质研究[J].岩石力学与工程学报,28(S1):3176~3180.
丁秀丽,付敬,刘建,等.2005.软硬互层边坡岩体的蠕变特性研究及稳定性分析[J].岩石力学与工程学报,24(19):3410-3418.
黎克日,康文法.1983.岩体中泥化夹层的流变试验及其长期强度的确定[J].岩土力学,4(1):39~45.
李丽.2013.地裂缝带Q3原状黄土三维流变本构及长期强度研究[硕士学位论文][D].西安:长安大学.
刘晶辉,王山长,杨洪海.1996.软弱夹层流变试验长期强度确定方法[J].勘察科学技术,(5):3~7.
孙钧.1999.岩土材料流变及工程应用[M].北京:中国建筑工业出版社.
万玲,彭向和,杨春和,等.2005.泥岩蠕变行为的实验研究及其描述[J].岩土力学,26(6):924~928.
王志俭,殷坤龙,简文星.2007.万州区红层软弱夹层蠕变试验研究[J].岩土力学,28(S1):40~44.
许豪,肖宏彬,滕珂.2011.南宁膨胀土直剪蠕变特性及长期强度试验研究[J].公路工程,36(1):31~35.
杨天鸿,芮勇勤,朱万成,等.2008.炭质泥岩泥化夹层的流变特性及长期强度[J].实验力学,23(5):396~402.
张奇华,彭光忠.1997.链子崖危岩体软弱夹层的蠕变性质研究[J]岩土力学,18(1):60~64.
朱长歧,郭见杨.1990.黏土流变特性再认识及确定长期强度的新方法[J].岩土力学,11(2):15~21.
朱定华,陈国兴.2002.南京红层软岩流变特性试验研究[J].南京工业大学学报(自然科学版),24(5):77~79.
祝艳波.2014.宜巴高速公路巴东组软岩碎屑土夹层的非饱和特性研究[博士学位论文][D].武汉:中国地质大学.