豫西北遗址土力学特性研究
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摘要
为能综合考虑遗址土的抗拉抗剪力学特性,以豫西北遗址土为研究对象,通过三轴剪切试验和单轴拉伸试验,测定出豫西北遗址土的抗剪强度和抗拉强度,并对得到的的试验结果进行了分析,推导出遗址土的双曲线强度公式;鉴于土体实际的莫尔圆不能超过相应的破坏强度线,于是利用几何关系及应力关系对遗址土的强度破坏应力进行了修正,探究破坏莫尔圆与强度线相切的应力修正算法。研究结果表明,利用Mohr-Coulomb强度理论计算出的抗拉强度值明显高于拉伸试验测定值,所建立的遗址土双曲线强度公式能合理地反映出遗址土的抗拉、抗剪力学特性,因此上述结果可为遗址土的工程灾害评价和加固保护提供理论依据。
In order to comprehensively consider the tensile and shear mechanical properties of the site soil,shear strength and tensile strength of site soil in northwest Henan Province were investigated through triaxial shear experiment and uniaxial tensile experiment.The test results of both strengths were analyzed and the hyperbolic strength formula of site soil was deduced.In view of the fact that the actual Mohr circle can not exceed the corresponding failure strength line of the soil,the strength and failure stress of the site soil was corrected by geometric relations and stress relations,and the stress correction algorithm to destroy the tangent between the Mohr circle and the strength line was explored.Results show that the tensile strength is calculated by using the Mohr-Coulomb strength theory was significantly higher than the tensile test value of soil,and the established hyperbolic strength formula of site soil can reasonably reflect the tensile and shear mechanical properties of site soil,and provide a theoretical basis for the engineering disaster evaluation and reinforcement protection of site soil.
In order to comprehensively consider the tensile and shear mechanical properties of the site soil,shear strength and tensile strength of site soil in northwest Henan Province were investigated through triaxial shear experiment and uniaxial tensile experiment.The test results of both strengths were analyzed and the hyperbolic strength formula of site soil was deduced.In view of the fact that the actual Mohr circle can not exceed the corresponding failure strength line of the soil,the strength and failure stress of the site soil was corrected by geometric relations and stress relations,and the stress correction algorithm to destroy the tangent between the Mohr circle and the strength line was explored.Results show that the tensile strength is calculated by using the Mohr-Coulomb strength theory was significantly higher than the tensile test value of soil,and the established hyperbolic strength formula of site soil can reasonably reflect the tensile and shear mechanical properties of site soil,and provide a theoretical basis for the engineering disaster evaluation and reinforcement protection of site soil.
引文
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[10]沈云霞,谌文武,杜伟飞,等.干湿循环下含盐量变化对遗址土剪切强度影响的试验研究[J].西北地震学报,2011,33(Z):227-230(SHEN Yunxia,CHEN Wenwu,DU Weifei,et al.Testing study on influence of salt contents on shear strength of ancient relics soil at dry-wet cycle[J].Northwestern Seismological Journal,2011,33(Z):227-230(in Chinese))
[11]刘炜,王力丹,孙满利.冻融破坏对汉长安城遗址土的结构影响研究[J].敦煌研究,2011(2):85-90(LIUWei,WANG Lidan,SUN Manli.A study on the impact of freeze-thaw action on the soil structure of Chang′an City in the Han Dynasty[J].Dunhuang Research,2011(2):85-90(in Chinese))
[12]刘伟平,扶名福,罗小艳,等.基于双曲线型Mohr强度准则下锚索极限抗拔力研究[J].煤炭工程,2010(3):92-93(LIU Weiping,FU Mingfu,LUO Xiaoyan,et al.Study on ultimate pulling force of anchor base on hyperbolic Mohr strength criterion[J].Coal Engineering,2010(3):92-93(in Chinese))
[13]陈昌禄,邵生俊,邓国华.土的结构性参数与强度的关系及其在边坡稳定分析中的应用[J].中南大学学报(自然科学版),2010,41(1):328-333(CHEN Changlu,SHAO Shengjun,DENG Guohua.Relationship between soil structural parameters and strength and its application in slope stability analysis[J].Journal of Central South University(Science and Technology),2010,41(1):328-333(in Chinese))
[14]李荣建,郑文,刘军定,等.考虑初始结构性参数的结构性黄土边坡稳定性评价[J].岩土力学,2014,35(1):143-150(LI Rongjian,ZHENG Wen,LIU Junding,et al.Evaluation of stability of structural loess slope considering initial structural parameters[J].Rock and Soil Mechanics,2014,35(1):143-150(in Chinese))
[15]王来贵,张红记,张春会,等.含水率和围压对安家岭泥岩峰后力学特性影响的试验研究[J].实验力学,2016,31(5):683-693(WANG Laigui,ZHANG Hongji,ZHANG Chunhui,et al.Experimental investigation on the effects of confining pressure and moisture content on post-peak mechanical behavior of anjialing mudstone[J].Journal of Experimental Mechanics,2016,31(5):683-693(in Chinese))
[16]GB/T 50123-1999,中华人民共和国建设部土工试验方法标准[S].北京:中国计划出版社,1999(GB/T 50123-1999,Standard for Soil Test Method of Ministry of Construction of the PRC[S].Beijing:China Planning Press,1999(in Chinese))
[17]高盼,陈波,胡云世,等.制样含水量对软黏土力学特性影响的试验研究[J].实验力学,2017,32(3):423-430(GAO Pan,CHEN Bo,HU Yunshi,et al.Experimental study of the impact of water content in slurry sample on mechanical behavior of remolded soft clay[J].Journal of Experimental Mechanics,2017,32(3):423-430(in Chinese))
[2]杨强义,李承蔚.毛细水干湿循环对土遗址风化影响的试验研究[J].地下空间与工程学报,2012,8(3):517-525(YANG Qiangyi,LI Chengwei.Research on the impact of drying and wetting cycle of capillary water on weathering of soil sites[J].Chinese Journal of Underground Space and Engineering,2012,8(3):517-525(in Chinese))
[3]谌文武,吕海敏,吴国鹏,等.盐分对遗址土体渗透性及孔径的影响[J].中南大学学报(自然科学版),2016,47(8):2747-2751(CHEN Wenwu,LV Haimin,WU Guopeng,et al.Influence of salt in site soils on permeability and pore diameter[J].Journal of Central South University(Science and Technology),2016,47(8):2747-2751(in Chinese))
[4]崔凯,谌文武,王旭东,等.干旱区土遗址盐渍带风蚀损耗效应微观机制研究[J].岩土力学,2012,33(4):1167-1172(CUI Kai,CHEN Wenwu,WANG Xudong,et al.Study of microscopic mechanism of effect of aeolian erosion ullage at salinization belt on earthen ruins in arid region[J].Rock and Soil Mechanics,2012,33(4):1167-1172(in Chinese))
[5]沈云霞.干湿循环作用下含盐类遗址土盐渍劣化试验研究[D].兰州大学,2011(SHEN Yunxia.Experiment study on salinized deterioration of the Saline ancient relics soil under dry-wet cycles[D].Lanzhou University,2011(in Chinese))
[6]匡静,谌文武,沈云霞,等.含氯盐遗址土盐渍风蚀效应试验研究[J].西北地震学报,2011,33(Z):209-213(KUANG Jing,CHEN Wenwu,SHEN Yunxia,et al.Experimental study on saline wind erosion effect of chlorine-contained site soil[J].Northwestern Seismological Journal,2011,33(Z):209-213(in Chinese))
[7]韩琳,谌文武,崔凯,等.盐分质量分数、含盐类别对山丹遗址土弹性波声速影响的实验[J].兰州大学学报(自然科学版),2010,46(6):18-22(HAN Lin,CHEN Wenwu,CUI Kai,et al.Influence of salt content and salt category on the elastic wave velocity of soil samples from ancient ruins in Shandan county[J].Journal of Lanzhou University(Natural Sciences),2010,46(6):18-22(in Chinese))
[8]秦虎,张峰,于伟,等.盐溶液在夯土遗址中的毛细水上升规律分析[J].世界科技研究与发展,2016,38(2):326-329(QIN Hu,ZHANG Feng,YU Wei,et al.Analysis on rising rules of capillary water of salt solution in earthen sites[J].World Sci-Tech R&D,2016,38(2):326-329(in Chinese))
[9]谌文武,吕海敏,崔凯,等.氯盐和硫酸盐对遗址土体颗粒级配和界限含水率影响的对比[J].兰州大学学报(自然科学版),2015,51(3):334-338(CHEN Wenwu,LV Haimin,CUI Kai,et al.Comparative study of the influence of chlorine and sulfate salt on grain size distribution and limit moisture content in site soils[J].Journal of Lanzhou University(Natural Sciences),2015,51(3):334-338(in Chinese))
[10]沈云霞,谌文武,杜伟飞,等.干湿循环下含盐量变化对遗址土剪切强度影响的试验研究[J].西北地震学报,2011,33(Z):227-230(SHEN Yunxia,CHEN Wenwu,DU Weifei,et al.Testing study on influence of salt contents on shear strength of ancient relics soil at dry-wet cycle[J].Northwestern Seismological Journal,2011,33(Z):227-230(in Chinese))
[11]刘炜,王力丹,孙满利.冻融破坏对汉长安城遗址土的结构影响研究[J].敦煌研究,2011(2):85-90(LIUWei,WANG Lidan,SUN Manli.A study on the impact of freeze-thaw action on the soil structure of Chang′an City in the Han Dynasty[J].Dunhuang Research,2011(2):85-90(in Chinese))
[12]刘伟平,扶名福,罗小艳,等.基于双曲线型Mohr强度准则下锚索极限抗拔力研究[J].煤炭工程,2010(3):92-93(LIU Weiping,FU Mingfu,LUO Xiaoyan,et al.Study on ultimate pulling force of anchor base on hyperbolic Mohr strength criterion[J].Coal Engineering,2010(3):92-93(in Chinese))
[13]陈昌禄,邵生俊,邓国华.土的结构性参数与强度的关系及其在边坡稳定分析中的应用[J].中南大学学报(自然科学版),2010,41(1):328-333(CHEN Changlu,SHAO Shengjun,DENG Guohua.Relationship between soil structural parameters and strength and its application in slope stability analysis[J].Journal of Central South University(Science and Technology),2010,41(1):328-333(in Chinese))
[14]李荣建,郑文,刘军定,等.考虑初始结构性参数的结构性黄土边坡稳定性评价[J].岩土力学,2014,35(1):143-150(LI Rongjian,ZHENG Wen,LIU Junding,et al.Evaluation of stability of structural loess slope considering initial structural parameters[J].Rock and Soil Mechanics,2014,35(1):143-150(in Chinese))
[15]王来贵,张红记,张春会,等.含水率和围压对安家岭泥岩峰后力学特性影响的试验研究[J].实验力学,2016,31(5):683-693(WANG Laigui,ZHANG Hongji,ZHANG Chunhui,et al.Experimental investigation on the effects of confining pressure and moisture content on post-peak mechanical behavior of anjialing mudstone[J].Journal of Experimental Mechanics,2016,31(5):683-693(in Chinese))
[16]GB/T 50123-1999,中华人民共和国建设部土工试验方法标准[S].北京:中国计划出版社,1999(GB/T 50123-1999,Standard for Soil Test Method of Ministry of Construction of the PRC[S].Beijing:China Planning Press,1999(in Chinese))
[17]高盼,陈波,胡云世,等.制样含水量对软黏土力学特性影响的试验研究[J].实验力学,2017,32(3):423-430(GAO Pan,CHEN Bo,HU Yunshi,et al.Experimental study of the impact of water content in slurry sample on mechanical behavior of remolded soft clay[J].Journal of Experimental Mechanics,2017,32(3):423-430(in Chinese))