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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。
The actual engineering activity is closely related to the nature of earth and rock under low stress. The engineering activities related to low stress conditions are summarized. Based on the summarization and analysis of landslides in dike and dam in previous earthquakes, it is pointed out that the landslide depth is usually less than 7 m, and the overlying effective stress is mostly less than 100 kPa. Based on the data of 106 sets of liquefaction data, it is pointed out that the liquefaction of the foundation mostly occurs under the low stress with the overlying effective stress lower than 100 kPa. In the current research, we usually focus on the engineering properties of earth and stone under medium and high stress conditions. In the application of low-stress area, the calculation parameters of soil-stone are usually consistent with the strength and deformation parameters obtained under moderate and high stress conditions, while the strength and deformation characteristics of soil-stone under high and low stress conditions are different. The applicability of the method of parameterization is questionable. Therefore, it is of important engineering significance and scientific value to study the engineering properties of soil-stone under low-stress conditions and to explore the method of calculating the parameters of soil-stone under low-stress conditions in numerical calculation.