黏粒含量对磁县段膨胀土抗剪强度影响的试验研究
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摘要
利用电动应变控制式直剪仪及直剪/残余剪切试验仪对南水北调磁县段不同黏粒含量的原状膨胀土进行快剪、饱和快剪、饱和固结快剪和反复直剪试验,研究黏粒含量对其抗剪强度的影响。研究表明:饱和后试样的抗剪强度明显降低,固结后强度提高,且饱和作用对黏粒含量较大的中膨胀土强度的削弱作用更为显著,固结作用对黏粒含量较小的弱膨胀土强度的"治愈"作用更显著;随黏粒含量的增大,黏聚力逐渐减小,内摩擦角则先减后增,其临界值在32%左右;峰值强度后的抗剪强度降低幅度随黏粒含量的增加而增大;土体的峰值强度τf随黏粒含量则先减后增,变化趋势比较平缓;残余强度τr随黏粒含量增加逐渐减小,成指数关系;残余强度内摩擦角φr与黏粒含量成对数关系,黏聚力cr则比较离散。
In order to study the effect of clay content on the shear strength of expansive soil,this paper conducts quick shear,saturated quick shear,saturated consolidated quick shear and repeated direct shear tests with electric strain controlled direct shear apparatus,residual shear test,and direct shear / residual shear test apparatus on the undisturbed expansive soils at Ci County Hebei of South- to- North Water Diversion. The soils have different clay contents. Studies show that: in the direct shear test,the shear strength of the expansive soil significantly reduces after the soil is saturated,and increases after it is consolidated. The effect of saturation on the strength of the expansive soil of larger clay content is more significant. The "cure"effect of consolidation on the strength of weak expansive soil of lesser clay content is more significant. As the clay content increases,the cohesion gradually decreases,and internal friction angle first decreases and then increases. The critical value is about 32%. In the repeated direct shear test,the shear strength after peak intensity increases as the clay content increases. The change trend is relatively flat. The residual strength τrdecreases exponentially as the clay content increases. Whilethe internal friction angle φrof the residual strength has a logarithmic relation with clay content. The cohesion crhas an irregular relation with the clay content.
In order to study the effect of clay content on the shear strength of expansive soil,this paper conducts quick shear,saturated quick shear,saturated consolidated quick shear and repeated direct shear tests with electric strain controlled direct shear apparatus,residual shear test,and direct shear / residual shear test apparatus on the undisturbed expansive soils at Ci County Hebei of South- to- North Water Diversion. The soils have different clay contents. Studies show that: in the direct shear test,the shear strength of the expansive soil significantly reduces after the soil is saturated,and increases after it is consolidated. The effect of saturation on the strength of the expansive soil of larger clay content is more significant. The "cure"effect of consolidation on the strength of weak expansive soil of lesser clay content is more significant. As the clay content increases,the cohesion gradually decreases,and internal friction angle first decreases and then increases. The critical value is about 32%. In the repeated direct shear test,the shear strength after peak intensity increases as the clay content increases. The change trend is relatively flat. The residual strength τrdecreases exponentially as the clay content increases. Whilethe internal friction angle φrof the residual strength has a logarithmic relation with clay content. The cohesion crhas an irregular relation with the clay content.
引文
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Huang Z Q,Wu L F,Wang A M,et al.2008.Stability analysis o expansive soil slope based on in-situ shear test[J].Rock and Soi Mechanics,29(7):1764~1768.
Li Q Y,Cheng Z L,Ma Q,et al.2009.Study on the failure mechanism and treatment technology of the expansive soil slope of MRP[J]South to North Water Transfers and Water Science&Technology,7(6):13~19.
Liu T H.1997.Expansive soil problems in engineerin construction[M].Beijing:China State Construction Engineerin Press:31~90.
Miao L C,Cui Y,Chen K J,et al.2006.Test on strength of unsaturate remolded expansive soils[J].Chinese Journal of Geotechnica Engineering,28(2):274~276.
Miao L C,Liu S Y.2002.Soil-water characteristics and shear strength o expansive soil[J].SHUILI XUEBAO,7:87~92.
Ministry of Water Resources of the People's Republic of China.1999Code for soil test method(GB/T50123-1999)[S].Beijing:Chin Planning Press.
Qiang F,Li P,Li T L.2014.Comparative test study between full softened and residual strengths of loess[J].Journal of Engineerin Geology,22(5):832~838.
Tan W H,Ren F H,Miao S J.2007.Influence of parameters of pea strength and residual strength on the reinforcement of slopes[J]Rock and Soil Mechanics,28(S1):616~618.
Wang M W,Li J,Xu P,et al.2014.Cloud model for shrinkage-swellin property classification of untreated and lime-treated expansiv clays[J].Journal of Southeast University,44(2):396~400.
Xu B,Yin Z Z,Liu S L.2011.Experimental study of factors influencin expansive soil strength[J].Rock and Soil Mechanics,32(1):44~50.
Xu C S,Yin Z Q,Du X L,et al.2013.Experimental study of shea strength of clay[J].Shuili Xuebao,44(12):1433~1438.
Xue X H,Yang X G.2013.Indoor-test research on improvement of expansiv soil[J].High Speed Railway Technology,4(6):33~36.
Zhao W J,Zhan W T,Ni X,et al.2009.Shear strength of baise remolded expansive soil[J].Rock and Soil Mechanics,30(S2):244~248.
Zhao X,Yang Y H,Zhu Y J.2014.Analysis of impact of crack surfac on shear strength of strong expansive soil[J].Rock and Soi Mechanics,35(1):130~133.
Zuo W R,Yang H P,Liu P.2007.Study on the determ ination o residual strength for expansive soil[J].Journal of Changsh Communications University,23(1):23~27.
陈尚法,温世亿,冷星火,等.2010.南水北调中线一期工程膨胀土渠坡处理措施[J].人民长江,41(16):65~68.
戴福初,王思敬,李焯芬.1998.香港大屿山残坡积土的残余强度试验研究[J].工程地质学报,6(3):223~228.
何运龙,刘晓琪,郄国增,等.2014.河北磁县膨胀岩(土)现场鉴别方法[J].南水北调与水利科技,12(3):198~200,137.
黄志全,吴林峰,王安明,等.2008.基于原位剪切试验的膨胀土边坡稳定性研究[J].岩土力学,29(7):1764~1768.
李青云,程展林,马黔,等.2009.膨胀土(岩)渠道破坏机理和处理技术研究[J].南水北调与水利科技,7(6):13~19.
刘特洪.1997.工程建设中的膨胀土问题[M].北京:中国建筑工程出版社:31~90.
缪林昌,崔颖,陈可君,等.2006.非饱和重塑膨胀土的强度试验研究[J].岩土工程学报,28(2):274~276.
缪林昌,刘松玉.2002.南阳膨胀土的水分特征和强度特性研究[J].水利学报,7:87~92.
强菲,李萍,李同录.2014.黄土完全软化强度与残余强度的对比试验研究[J].工程地质学报,22(5):832~838.
谭文辉,任奋华,苗胜军.2007.峰值强度与残余强度对边坡加固的影响研究[J].岩土力学,28(增刊):616~618.
汪明武,李健,徐鹏,等.2014.膨胀土与石灰改良膨胀土胀缩性的云模型评价[J].东南大学学报,44(2):396~400.
徐彬,殷宗泽,刘述丽.2011.膨胀土强度影响因素与规律的试验研究[J].岩土力学,32(1):44~50.
许成顺,尹占巧,杜修力,等.2013.黏性土的抗剪强度试验研究[J].水利学报,44(12):1433~1438.
薛新华,杨兴国.2013.膨胀土改良的室内试验研究[J].高速铁路技术,4(6):33~36.
赵文建,湛文涛,倪啸,等.2009.百色重塑膨胀土抗剪强度的试验研究[J].岩土力学,30(增2):244~248.
赵鑫,阳云华,朱瑛洁,等.2014.裂隙面对强膨胀土抗剪强度影响分析[J].岩土力学,35(1):130~133.
中华人民共和国国家标准编写组.1999.土工试验方法标准(GBT50123-1999)[S].北京:中国计划出版社.
左巍然,杨和平,刘平.2007.确定膨胀土残余强度的试验研究[J]长沙交通学院学报,23(1):23~27.
Dai F C,Wang S J,Lee C F.1998.The drained residual strength o volcanics-derived soil sampled on Lantau Island Hong Kong[J]Journal of Engineering Geology,6(3):223~228.
He Y L,Liu X Q,Xi G Z,et al.2014.Research on field identification method of swelling rock(soil)in Ci County of Hebei[J].South t North Water Transfers and Water Sscience&Technology,12(3)198~200,137.
Huang Z Q,Wu L F,Wang A M,et al.2008.Stability analysis o expansive soil slope based on in-situ shear test[J].Rock and Soi Mechanics,29(7):1764~1768.
Li Q Y,Cheng Z L,Ma Q,et al.2009.Study on the failure mechanism and treatment technology of the expansive soil slope of MRP[J]South to North Water Transfers and Water Science&Technology,7(6):13~19.
Liu T H.1997.Expansive soil problems in engineerin construction[M].Beijing:China State Construction Engineerin Press:31~90.
Miao L C,Cui Y,Chen K J,et al.2006.Test on strength of unsaturate remolded expansive soils[J].Chinese Journal of Geotechnica Engineering,28(2):274~276.
Miao L C,Liu S Y.2002.Soil-water characteristics and shear strength o expansive soil[J].SHUILI XUEBAO,7:87~92.
Ministry of Water Resources of the People's Republic of China.1999Code for soil test method(GB/T50123-1999)[S].Beijing:Chin Planning Press.
Qiang F,Li P,Li T L.2014.Comparative test study between full softened and residual strengths of loess[J].Journal of Engineerin Geology,22(5):832~838.
Tan W H,Ren F H,Miao S J.2007.Influence of parameters of pea strength and residual strength on the reinforcement of slopes[J]Rock and Soil Mechanics,28(S1):616~618.
Wang M W,Li J,Xu P,et al.2014.Cloud model for shrinkage-swellin property classification of untreated and lime-treated expansiv clays[J].Journal of Southeast University,44(2):396~400.
Xu B,Yin Z Z,Liu S L.2011.Experimental study of factors influencin expansive soil strength[J].Rock and Soil Mechanics,32(1):44~50.
Xu C S,Yin Z Q,Du X L,et al.2013.Experimental study of shea strength of clay[J].Shuili Xuebao,44(12):1433~1438.
Xue X H,Yang X G.2013.Indoor-test research on improvement of expansiv soil[J].High Speed Railway Technology,4(6):33~36.
Zhao W J,Zhan W T,Ni X,et al.2009.Shear strength of baise remolded expansive soil[J].Rock and Soil Mechanics,30(S2):244~248.
Zhao X,Yang Y H,Zhu Y J.2014.Analysis of impact of crack surfac on shear strength of strong expansive soil[J].Rock and Soi Mechanics,35(1):130~133.
Zuo W R,Yang H P,Liu P.2007.Study on the determ ination o residual strength for expansive soil[J].Journal of Changsh Communications University,23(1):23~27.
陈尚法,温世亿,冷星火,等.2010.南水北调中线一期工程膨胀土渠坡处理措施[J].人民长江,41(16):65~68.
戴福初,王思敬,李焯芬.1998.香港大屿山残坡积土的残余强度试验研究[J].工程地质学报,6(3):223~228.
何运龙,刘晓琪,郄国增,等.2014.河北磁县膨胀岩(土)现场鉴别方法[J].南水北调与水利科技,12(3):198~200,137.
黄志全,吴林峰,王安明,等.2008.基于原位剪切试验的膨胀土边坡稳定性研究[J].岩土力学,29(7):1764~1768.
李青云,程展林,马黔,等.2009.膨胀土(岩)渠道破坏机理和处理技术研究[J].南水北调与水利科技,7(6):13~19.
刘特洪.1997.工程建设中的膨胀土问题[M].北京:中国建筑工程出版社:31~90.
缪林昌,崔颖,陈可君,等.2006.非饱和重塑膨胀土的强度试验研究[J].岩土工程学报,28(2):274~276.
缪林昌,刘松玉.2002.南阳膨胀土的水分特征和强度特性研究[J].水利学报,7:87~92.
强菲,李萍,李同录.2014.黄土完全软化强度与残余强度的对比试验研究[J].工程地质学报,22(5):832~838.
谭文辉,任奋华,苗胜军.2007.峰值强度与残余强度对边坡加固的影响研究[J].岩土力学,28(增刊):616~618.
汪明武,李健,徐鹏,等.2014.膨胀土与石灰改良膨胀土胀缩性的云模型评价[J].东南大学学报,44(2):396~400.
徐彬,殷宗泽,刘述丽.2011.膨胀土强度影响因素与规律的试验研究[J].岩土力学,32(1):44~50.
许成顺,尹占巧,杜修力,等.2013.黏性土的抗剪强度试验研究[J].水利学报,44(12):1433~1438.
薛新华,杨兴国.2013.膨胀土改良的室内试验研究[J].高速铁路技术,4(6):33~36.
赵文建,湛文涛,倪啸,等.2009.百色重塑膨胀土抗剪强度的试验研究[J].岩土力学,30(增2):244~248.
赵鑫,阳云华,朱瑛洁,等.2014.裂隙面对强膨胀土抗剪强度影响分析[J].岩土力学,35(1):130~133.
中华人民共和国国家标准编写组.1999.土工试验方法标准(GBT50123-1999)[S].北京:中国计划出版社.
左巍然,杨和平,刘平.2007.确定膨胀土残余强度的试验研究[J]长沙交通学院学报,23(1):23~27.