扰动土-结构接触面抗剪强度特性试验研究
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摘要
针对地下空间开发等原因引起的扰动土-结构接触面抗剪强度特性,制备了干密度、孔隙比、含水率和饱和度4类物理性质指标变化的扰动土样,在传统应变控制直剪仪上通过改进的试验方案,探究扰动土与粗糙、光滑和极光滑3类粗糙度接触面的抗剪强度变化规律。试验结果表明,对各类粗糙度接触面,抗剪强度及外摩擦角,均随含水率、孔隙比、饱和度的增大而非线性减小,而随干密度的增加而非线性增加,其中含水率在10%~15%或饱和度在40%~50%范围时改变显著。对于极光滑接触面,抗剪强度及外摩擦角受土的扰动影响微小,基本可以忽略。试验结果为扰动土-结构接触面抗剪强度规律和扰动土-结构相互作用的进一步研究提供了试验依据。
Disturbed soil samples are prepared for simulating physical property variation in dry density,water content,void ratio and degree of saturation caused by construction of underground building. An improved experimental process is presented to study shear strength characteristics on disturbed soil-structure interfaces using a conventional strain-controlled direct shear instrument. Three types of interface roughness are employed which are rough,smooth and extremely smooth to reflect actual surfaces of concrete and steel building materials. Experimental results show that for any types of interface roughness,shear strength,indicating the angles of external frication of disturbed soilstructure interfaces,overall nonlinearly decreases with increases of soil water content,void ratio or degree of saturation,but nonlinearly increases with increase of its dry density. In particular,the shear strength and the angles of external frication vary rapidly for a slight change of water content within the range between 10% and 15% or of degree of saturation within the range between 40% and 50%. However they vary gently with water content or degree of saturation out of the two ranges. For the extremely smooth interface variation of the shear strength may be ignored caused by the changes of disturbed soil property. Experimental results would be fundamental for investigation of the rules of shear strength on disturbed soil-structure interfaces and the disturbed soil-structure interaction.
Disturbed soil samples are prepared for simulating physical property variation in dry density,water content,void ratio and degree of saturation caused by construction of underground building. An improved experimental process is presented to study shear strength characteristics on disturbed soil-structure interfaces using a conventional strain-controlled direct shear instrument. Three types of interface roughness are employed which are rough,smooth and extremely smooth to reflect actual surfaces of concrete and steel building materials. Experimental results show that for any types of interface roughness,shear strength,indicating the angles of external frication of disturbed soilstructure interfaces,overall nonlinearly decreases with increases of soil water content,void ratio or degree of saturation,but nonlinearly increases with increase of its dry density. In particular,the shear strength and the angles of external frication vary rapidly for a slight change of water content within the range between 10% and 15% or of degree of saturation within the range between 40% and 50%. However they vary gently with water content or degree of saturation out of the two ranges. For the extremely smooth interface variation of the shear strength may be ignored caused by the changes of disturbed soil property. Experimental results would be fundamental for investigation of the rules of shear strength on disturbed soil-structure interfaces and the disturbed soil-structure interaction.
引文
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[14]陈俊桦,张家生,李键.考虑粗糙度的黏性土-结构接触面力学特性试验[J].四川大学学报(工程科学版),2015,47(4):22-30.(Chen Junhua,Zhang Jiasheng,Li Jian.Experimental research on mechanical characteristics of cohesive soil-structure interface by considering its roughness[J].Journal of Sichuan University(Engineering Science Edition),2015,47(4):22-30.(in Chinese))
[15]中华人民共和国住房和城乡建设部.建筑地基基础设计规范(GB 50007-2011)[S].北京:中国建筑工业出版社,2011.(Ministry of Housing and UrbanRural Construction of the People’s Republic of China.Code for design of building foundation(GB 50007—2011)[S].Beijing:China Architecture and Building Press,2011.(in Chinese))
[2]Clough G W,Duncan J M.Finite element analysis of retaining wall behavior[J].Journal of Soil Mechanics and Foundations Division,ASCE,1971,97(12):1657-1672.
[3]殷宗泽,朱泓,许国华.土与结构材料接触面的变形及其数学模拟[J].岩土工程学报,1994,16(3):14-22.(Yin Zongze,Zhu Hong,Xu Guohua.Deformation and mathematical simulation of the contact surface between soil and structural material[J].Chinese Journal of Geotechnical Engineering,1994,16(3):14-22.(in Chinese))
[4]徐建平,周健,白冰.土体取样扰动的影响及其评价指标[J].佛山科学技术学院学报(自然科学版),2000,18(3):20-24.(Xu Jianping,Zhou Jian,Bai Bing.The effects of sample disturbance on soil and the establishment of its evaluation index[J].Journal of Foshan University(Natural Science Edition),2000,18(3):20-24.(in Chinese))
[5]胡黎明,濮家骝.土与结构物接触面力学特性试验研究[J].岩土工程学报,2001,23(4):431-435.(Hu Liming,Pu Jialiu.Experimental study on mechanical characteristics of soil-structure interface[J].Chinese Journal of Geotechnical Engineering,2001,23(4):431-435.(in Chinese))
[6]张嘎,张建明.大型土与结构接触面循环加载剪切仪的研制及应用[J].岩土工程学报,2003,25(2):149-153.(Zhang Ga,Zhang Jianmin.Development and application of cyclic shear apparatus for soil-structure interface[J].Chinese Journal of Geotechnical Engineering,2003,25(2):149-153.(in Chinese))
[7]张嘎,张建明.粗粒土与结构接触面统一本构模型及试验验证[J].岩土工程学报,2005,27(10):1175-1179.(Zhang Ga,Zhang Jianmin.Unified modeling of soil-structure interface and its test confirmation[J].Chinese Journal of Geotechnical Engineering,2005,27(10):1175-1179.(in Chinese))
[8]周爱兆,卢廷浩,刘尧.土与结构接触面力学特性研究现状与展望[J].河海大学学报(自然科学版),2007,35(5):524-528.(Zhou Aizhao,Lu Tinghao,Liu Yao.Current research and prospect of mechanical behaviors of soil-structure interfaces[J].Journal of Hohai University(Natural Sciences),2007,35(5):524-528.(in Chinese))
[9]于广云.采动区大变形扰动土物理力学性质演变及工程响应研究[D].徐州:中国矿业大学,2009.(Yu Guangyun.Physical and mechanical properties evolution and engineering response of disturbed soil in mining subsidence area with large vertical deformation[D].Xuzhou:China University of Mining and Technology,2009.(in Chinese))
[10]乔来军,周国庆,商翔宇,等.不同含水量黄土-砂浆接触特性试验应用研究[J].地下空间与工程学报,2010,6(增2):1660-1664.(Qiao Laijun,Zhou Guoqing,Shang Xiangyu,et al.Study on the influence of water content on mechanical behavior of loess-sand mortar interface and its application[J].Chinese Journal of Underground Space and Engineering,2010,6(Supp.2):1660-1664.(in Chinese))
[11]夏红春,周国庆.土-结构接触面剪切力学特性及其影响因素试验[J].中国矿业大学学报,2010,39(6):831-836.(Xia Hongchun,Zhou Guoqing.Experimental study of the mechanical characteristics at a soil-Structure interface and the factors affecting them[J].Journal of China University of Mining and Technology,2010,39(6):831-836.(in Chinese))
[12]王伟,张芳,孙斌祥.土-结构接触面剪切试验与应力—位移模型[J].煤炭学报,2011,36(9):1469-1473.(Wang Wei,Zhang Fang,Sun Binxiang.Tested and modeled shear stress-displacement behavior of soilstructure interface[J].Journal of China Coal Society,2011.36(9):1469-1473.(in Chinese))
[13]常虹,夏军武,孔伟,等.采动区扰动土-结构界面剪切特性的试验研究[J].中国矿业大学学报,2013,42(4):535-539.(Chang Hong,Xia Junwu,Kong Wei,et al.Experimental study on shear characteristics of disturbed soil-structure interface within mining subsidence areas[J].Journal of China University of Mining and Technology,2013,42(4):535-539.(in Chinese))
[14]陈俊桦,张家生,李键.考虑粗糙度的黏性土-结构接触面力学特性试验[J].四川大学学报(工程科学版),2015,47(4):22-30.(Chen Junhua,Zhang Jiasheng,Li Jian.Experimental research on mechanical characteristics of cohesive soil-structure interface by considering its roughness[J].Journal of Sichuan University(Engineering Science Edition),2015,47(4):22-30.(in Chinese))
[15]中华人民共和国住房和城乡建设部.建筑地基基础设计规范(GB 50007-2011)[S].北京:中国建筑工业出版社,2011.(Ministry of Housing and UrbanRural Construction of the People’s Republic of China.Code for design of building foundation(GB 50007—2011)[S].Beijing:China Architecture and Building Press,2011.(in Chinese))