【作者】 牛富俊； 常小晓；

【Author】 Niu Fujun,Chang Xiaoxiao State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,CAS,Lanzhou,Gansu 73000

【机构】 中科院寒区旱区环境与工程研究所冻土工程国家重点实验室；

【摘要】 人工冻结工程中,天然岩土变为冻岩土,其物理力学性质会发生显著变化,而矿山凿井冻结工程的冻土力学参数,是冻结壁设计和开挖的依据。据此展开室内试验,研究结果表明:在相同的温度条件下,不同土质的单轴抗压强度差别较大;在载应力作用初期,冻土的强度衰减很快,在设计中必须考虑冻土的长期强度,而不能用瞬时强度代替长期强度。更多还原

【Abstract】 In artificial ground freezing projects,natural unfrozen soils becomes frozen soils,and their physical and mechanical properties will be greatly changed.The mechanical properties of frozen soil in artificial frozen shaft,especially the strength and creep properties,are the basis of freezing wall design and excavation.Analyses of test results show:(1)Under the same temperature condition,the uniaxial compressive strength of different soils is of obvious difference.The strength is of great declination with the destruction of original structure of soil.2)The diminishing of the frozen soil strength is quick in the initial stage of loading.Therefore,the long-term strength of frozen soil in the design must be considered,and it can’t be replaced by the instantaneous strength.更多还原