堆积体滑坡抗滑桩所受推力计算及分布特征研究
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摘要
沿下伏基岩面失稳是堆积体滑坡破坏主要模式之一,在土石混合体介质-接触面大型直剪试验成果基础上,发现土石混合体介质与接触面在剪切试验过程中表现出应变硬化和应变软化两种接触面力学性质,建立了能够描述上述两种接触面性质的表达式。基于一个简化的力学模型通过求系统极值的尖点突变理论推导了堆积体滑坡抗滑桩所受滑坡推力的计算公式,公式中考虑了上述描述应变硬化和应变软化两种接触面力学的表达式,利用该公式分析了其中的主要参数对抗滑桩所受推力大小及分布特征的影响。最后将推导公式应用到一个堆积层古滑坡实例中,对比分析表明该理论结果与现场实测结果具有较好的一致性。
Talus always slides along the bedrock surface.On the basis of straight shear tests on earth-rock aggregate and bedrock,the sliding surface of talus slide is a combination of two media: strain-hardening and strain-softening.A shear stress-strain constitutive model for the strain-softening medium is described by the Weibull's distribution law.A shear stress-strain constitutive model for the strain-hardening medium is described by the linear equation.Based on a simplified model for anti-sliding piles in talus slide,the formulas for calculating thrust on anti-sliding piles are derived by considering the above two shear stress-strain constitutive models.How the main parameters of the proposed formulas affect the distribution laws of talus slide thrust on anti-sliding pile is discussed.Finally,the rationality of the proposed formulas is demonstrated based on comparative analysis of the theoretical and the experimental results.
Talus always slides along the bedrock surface.On the basis of straight shear tests on earth-rock aggregate and bedrock,the sliding surface of talus slide is a combination of two media: strain-hardening and strain-softening.A shear stress-strain constitutive model for the strain-softening medium is described by the Weibull's distribution law.A shear stress-strain constitutive model for the strain-hardening medium is described by the linear equation.Based on a simplified model for anti-sliding piles in talus slide,the formulas for calculating thrust on anti-sliding piles are derived by considering the above two shear stress-strain constitutive models.How the main parameters of the proposed formulas affect the distribution laws of talus slide thrust on anti-sliding pile is discussed.Finally,the rationality of the proposed formulas is demonstrated based on comparative analysis of the theoretical and the experimental results.
引文
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[10]王小锋.两家人堆积体三维地质特征及稳定性评价[D].南京:河海大学,2007.(WANG Xiao-feng.Study on3Dgeologic feature and stability of Liangjia-ren deposits[D].Nanjing:Hohai University,2007.(in Chinese))
[11]张健.土石混合体关键力学性质试验研究[D].北京:中国科学院研究生院,2011.(ZHANG Jian.Experimentalresearch on soil-rock mixture in the key mechanicalproperties[D].Beijing:Graduate University of ChineseAcademy of Sciences,2011.(in Chinese))
[12]QIN S Q,JIAO J J,WANG S J.A nonlinear catastrophemodel of instability of planar-slip slope and chaoticdynamical mechanisms of its evolutionary process[J].International Journal of Solids and Structures,2001,38(4):8093–8109.
[13]ZHANG Ye-min,LUAN Mao-tian,LI Shun-quan.Estimationof liquefaction based on catastrophe theory[J].计算力学学报,2008(4):237–240.(ZHANG Ye-min,LUAN Mao-tian,LI Shun-quan.Estimation of liquefaction based oncatastrophe theory[J].Chinese Journal of ComputationalMechanics,2008(4):237–240.(in Chinese))
[14]刘军.缓倾角层状岩体失稳的尖点突变模型研究[J].岩土工程学报,2001,23(1):42–44.(LIU Jun.Study ofcatastrophic model with cusp point for failure of stratifiedrock mass with gentle inclination[J].Chinese Journal ofGeotechnical Engineering,2001,23(1):42–44.(inChinese))
[15]张业民,宋长清.软黏土流动性的尖顶突变模型分析[J].岩土工程学报,1995,17(4):67–70.(ZHANG Ye-min,SONG Chang-qing.Analysis of flowing rule for soft claywith cusp catastrophe model[J].Chinese Journal ofGeotechnical Engineering,1995,17(4):67–70.(inChinese))
[16]许强,黄润秋.地震作用下结构非线性响应的突变分析[J].岩土工程学报,1997,19(4):25–29.(XU Qiang,HUANG Run-qiu.Catastrophic analysis of nonlinearresponse of structure under earthquake[J].Chinese Journal ofGeotechnical Engineering,1997,19(4):25–29.(inChinese))
[17]姚晓阳,周育峰,刘伯莹.堆积层古滑坡抗滑桩受力监测及分析[C]//中国交通建设集团有限公司第一届科技大会论文集.北京:人民交通出版社,2009:245–251.(YAOXiao-yang,ZHOU Yu-feng,LIU Bo-ying.Force monitoringand analysis of anti-slide pile in talus slide[C]//The FirstSession of the Conference on Science and TechnologyProceedings of China Communications Construction Group.Beijing:China Communications Press,2009:245–251.(inChinese))
[2]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定性安全系数[J].岩土工程学报,2002,24(3):344–346.(ZHAO Shang-yi,ZHENG Ying-ren,SHI Wei-min,et al.Analysis of safety factor of slope by strength reductionFEM[J].Chinese Journal of Geotechnical Engineering,2002,24(3):344–346.(in Chinese))
[3]戴自航.抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J].岩石力学与工程学报,2004,21(4):517–521.(DAIZi-hang.Study on distribution laws of landslide-thrust andresistance of sliding mass acting on antislide piles[J].ChineseJournal of Rock Mechanics and Engineering,2004,21(4):517–521.(in Chinese))
[4]陶波.抗滑桩上侧向膨胀力与等效锚固力分布规律研究[D].长春:吉林大学,2003.(TAO Bo.Research ondistribution feature of the lateral swelling force andequivalently anchoring force imposed on the ant-sliding pile[D].Changchun:Jinlin University,2003.(in Chinese))
[5]铁道部第二勘察设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.(MOR Second Survey and sesignInstitute.Anti-slide pile design and calculation[M].Beijing:China Railway Press,1983.(in Chinese))
[6]熊治文.深埋式抗滑桩的受力分布规律[J].中国铁道科学,2000,21(1):48–51.(XIONG Zhi-wen.Force distributionrule of deeply buried anti-slide pile[J].China RailwayScience,2000,21(1):48–51.(in Chinese))
[7]广东省高速公路有限公司.京珠高速公路粤境北段路堑高边坡病害预防及防治措施研究[R].广州:广东省高速公路有限公司,2003.(Guangdong Province Expressway Co.,Ltd.Study on disaster prevention and treatment measures forhigh side slope of cutting[R].Guangzhou:GuangdongProvince Expressway Co.,Ltd.,2003.(in Chinese))
[8]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,4(10):57–61.(ZHENGYing-ren,ZHAO Shang-yi,ZHANG Lu-yu.Slope stabilityanalysis by strength reduction FEM[J].Engineering Science,2002,4(10):57–61.(in Chinese))
[9]王培勇,彭玉麒,刘元雪,等.基于定点剪出法抗滑桩滑坡推力分布形式的确定[J].后勤工程学院学报,2010,26(2):1–4.(WANG Pei-yong,PENG Yu-qi,LIU Yuan-xue,et al.Distribution of landslide thrust on anti-slide pile ascertainedby specified shear opening method[J].Journal of LogisticalEngineering University,2010,26(2):1–4.(in Chinese))
[10]王小锋.两家人堆积体三维地质特征及稳定性评价[D].南京:河海大学,2007.(WANG Xiao-feng.Study on3Dgeologic feature and stability of Liangjia-ren deposits[D].Nanjing:Hohai University,2007.(in Chinese))
[11]张健.土石混合体关键力学性质试验研究[D].北京:中国科学院研究生院,2011.(ZHANG Jian.Experimentalresearch on soil-rock mixture in the key mechanicalproperties[D].Beijing:Graduate University of ChineseAcademy of Sciences,2011.(in Chinese))
[12]QIN S Q,JIAO J J,WANG S J.A nonlinear catastrophemodel of instability of planar-slip slope and chaoticdynamical mechanisms of its evolutionary process[J].International Journal of Solids and Structures,2001,38(4):8093–8109.
[13]ZHANG Ye-min,LUAN Mao-tian,LI Shun-quan.Estimationof liquefaction based on catastrophe theory[J].计算力学学报,2008(4):237–240.(ZHANG Ye-min,LUAN Mao-tian,LI Shun-quan.Estimation of liquefaction based oncatastrophe theory[J].Chinese Journal of ComputationalMechanics,2008(4):237–240.(in Chinese))
[14]刘军.缓倾角层状岩体失稳的尖点突变模型研究[J].岩土工程学报,2001,23(1):42–44.(LIU Jun.Study ofcatastrophic model with cusp point for failure of stratifiedrock mass with gentle inclination[J].Chinese Journal ofGeotechnical Engineering,2001,23(1):42–44.(inChinese))
[15]张业民,宋长清.软黏土流动性的尖顶突变模型分析[J].岩土工程学报,1995,17(4):67–70.(ZHANG Ye-min,SONG Chang-qing.Analysis of flowing rule for soft claywith cusp catastrophe model[J].Chinese Journal ofGeotechnical Engineering,1995,17(4):67–70.(inChinese))
[16]许强,黄润秋.地震作用下结构非线性响应的突变分析[J].岩土工程学报,1997,19(4):25–29.(XU Qiang,HUANG Run-qiu.Catastrophic analysis of nonlinearresponse of structure under earthquake[J].Chinese Journal ofGeotechnical Engineering,1997,19(4):25–29.(inChinese))
[17]姚晓阳,周育峰,刘伯莹.堆积层古滑坡抗滑桩受力监测及分析[C]//中国交通建设集团有限公司第一届科技大会论文集.北京:人民交通出版社,2009:245–251.(YAOXiao-yang,ZHOU Yu-feng,LIU Bo-ying.Force monitoringand analysis of anti-slide pile in talus slide[C]//The FirstSession of the Conference on Science and TechnologyProceedings of China Communications Construction Group.Beijing:China Communications Press,2009:245–251.(inChinese))
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