低应力条件下的岩土工程问题
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摘要
结合实际工程建设需求,对工程建设和开发中涉及低应力条件的岩土工程问题进行系统的总结和分析,包括未来月球资源开发,土工构筑物浅层土体的变形和稳定,地基地震液化,室内和原位试验的判释和应用等。国内外目前的研究多关注土石料在中、高应力条件下的工程性质,对低应力条件下土石料工程性质研究很少且研究结论有相悖之处。在应用中低应力区的土石料计算参数取值通常与中、高应力条件下获得的强度和变形参数一致,而土石料的强度和变形性质对应力条件有很强的依赖性,不同应力条件下土石料的强度和变形特性可能差异较大,这种计算参数取值方法的适用性存在疑虑。建议对低应力条件下土石料静、动力工程性质开展系统的试验研究,在此基础上,研究能够反映低应力条件下土石料工程特点的本构模型,为土工结构低应力区土石料参数设计标准的选择及土工结构数值分析中低应力区材料参数取值提供科学依据。
Geotechnical problems under low confining pressure conditions were summarized,including thefuture development of lunar resources,deformation and stability of geotechnical structures in shallow soil,liquefaction of foundation soils, interpretation and application of laboratory and in-situ tests. In previousstudy,attention was paid only to the properties of soil-rock materials under high confining stress,and inapplications the parameters of soil-rock materials under low confining stress were assigned in the same wayas under medium to high confining stress;while the reliability of this parameter selection method was dis-putable,because the properties of soil-rock materials are seriously dependent on the stress. Therefore, rec-ommendations for studying on the static and dynamic engineering properties of soil-rock materials and estab-lishing constitutive models applicable to soils-rock materials under low confining stress were made to pro-vide scientific basis for design criteria selection of the soil-rock materials and corresponding parameters se-lection method in numerical simulation
Geotechnical problems under low confining pressure conditions were summarized,including thefuture development of lunar resources,deformation and stability of geotechnical structures in shallow soil,liquefaction of foundation soils, interpretation and application of laboratory and in-situ tests. In previousstudy,attention was paid only to the properties of soil-rock materials under high confining stress,and inapplications the parameters of soil-rock materials under low confining stress were assigned in the same wayas under medium to high confining stress;while the reliability of this parameter selection method was dis-putable,because the properties of soil-rock materials are seriously dependent on the stress. Therefore, rec-ommendations for studying on the static and dynamic engineering properties of soil-rock materials and estab-lishing constitutive models applicable to soils-rock materials under low confining stress were made to pro-vide scientific basis for design criteria selection of the soil-rock materials and corresponding parameters se-lection method in numerical simulation
引文
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[2]刘军.欧阳自远回应“探月无意义”说:目光短浅[N/OL].南方都市报,2013-12-15(2013-12-21)http://news.sciencenet.cn/htmlnews/2013/12/286296.shtm.
[3]刘启旺,刘小生,陈宁,等.双江口心墙堆石坝地震残余变形的振动台模型试验研究[J].水力发电,2009,35(5):60-62.
[4]汪闻韶,黄锦德.中国水利工程震害资料汇编1961-1985年[R].北京:中国水利水电科学研究院,1990.
[5]杨玉生,温彦锋,刘小生,等.水利工程震害中土工结构低应力破坏实例分析[J].岩土力学,2012,33(9):2729-2734.
[6]Sakamoto S,Yoshida H,Yamaguchi Y,et al.Numerical simulation of sliding of an earth dam during the 1995Kobe earthquake[C]//Proceeding of the 3rd US-Japan Workshop on Advanced Research on Earthquake Engineer-ing for Dams,San Diego,California:2001.
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[8]V M PONCE,J M BELL.Shear strength of sand at extremely low pressures[J].Journal of the Soil Mechanics andFoundations Division ASCE,1971,97(4):625-638.
[9]Yamaguchi Yoshikazu,Satoh Hiroyuki,Hayashi Naoyoshi,et al.Strength evaluateon of rockfill materials consid-ering confining pressure dependency[C]//Jia Jinsheng,Sun Zhiyu,Xu Zeping,et al.Modern Rockfill Dams—2009.Beijing:China Water Conservancy and Electricity Press,2009:437-446.
[10]Fumio Tatsuoka,Shoji Sonnoda,Katsushige Hara,et al.Pradhan.Failure and deformation of sand in torsionalshea[rJ].Soils and foundations,1986,26(4):79-97.
[11]Yanyan Agustian,oshi Goto.Strength and deformation characteristics of scoria in triaxila compression at low con-fining stresss[J].Soils and Foundation,2008(48):127-139.
[12]Md Abu Sayeed,Kiichi Suzuki,Md Mizanur Rahman.Strength and deformation characteristics of granular mate-rials under extremely low to high confining pressures in triaxilal compression[J].International Journal of Civil&Environmental Engineering,2011,11(04):1-6.
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