【摘要】 实际工程活动与低应力下土石料工程性质密切相关。总结了与低应力条件相关的工程活动,在总结分析以往地震中堤防和坝体滑坡案例的基础上,指出滑坡深度通常小于7 m,其上覆有效应力大多小于100 kPa。在对106组地震液化数据资料分析的基础上,指出地基液化大多发生在上覆有效应力低于100 kPa的低应力条件下。在目前的研究中,通常只关注中、高应力条件下土石料的工程性质。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,而高、低应力条件下土石料的强度和变形特性是不同的,这种计算参数取值方法的适用性存在疑虑。因此,研究低应力条件下土石料的工程性质,探讨数值计算中低应力条件下土石料计算参数的取值方法,具有重要的工程意义和科学价值。更多还原

【Abstract】 Practical engineering activities are closely related to engineering properties of soil-rock materials under low confining stress.Cases of landslides of Levees and dams due to earthquake were summarized and analyzed;and it revealed that the depth of landslides was usually less than 7m,and the effective overburden stress was usually not more than 100 kPa.106 cases of the foundation liquefaction were analyzed;and it is revealed that the foundation liquefaction occurred mostly at where the effective overburden stress below 100 kPa.In the present study,only the properties of soil-rock materials under high confining stress are paid great attention,and in applications the parameters of soil-rock materials under low confining stress are assigned the same as those under medium to high confining stress;while the reliability of this parameter selection method is disputable for the properties of soil-rock materials are seriously dependent on the stress.Therefore,study of the engineering properties of soil-rock materials under low confining stress and discussing the corresponding parameters selection method in numerical simulation have great significance both to engineering practice and scientific research.更多还原