低应力条件下的岩土工程问题  

Geotechnical problems under low confining stress conditions

作　　者：杨玉生[1] 刘启旺[1] 温彦锋[1] 刘小生[1] 杨正权[1] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100048

出　　处：《中国水利水电科学研究院学报》2015年第1期9-13,33,共6页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家自然科学基金青年项目(51209234);973计划项目(2013CB036404);中国水利院科研专项(GE0145B102014)

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 the future 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 previous study, attention was paid only to the properties of soil-rock materials under high confining stress, and in applications the parameters of soil-rock materials under low confining stress were assigned in the same way as 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

关 键 词：低应力 岩土工程问题 土石料工程性质 

分 类 号：TU375.4[建筑科学—结构工程]