水利工程震害中土工结构低应力破坏实例分析  

Case studies of earthen structures for hydraulic projects damaged under low confining stress during earthquake

作　　者：杨玉生[1,2] 温彦锋[1,2] 刘小生[1,2] 赵剑明[1,2] 刘启旺[1,2] 

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 [2]中国水利水电科学研究院水利部水工程建设与安全重点实验室,北京100048

出　　处：《岩土力学》2012年第9期2729-2735,2742,共8页Rock and Soil Mechanics

基　　金："十一五"国家科技支撑项目(No.2009BAK56B02);水利部公益性行业科研专项经费项目(No.200801133)

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。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.

关 键 词：水利工程震害 土工结构 低应力破坏 滑坡和液化案例 

分 类 号：TV131[水利工程—水力学及河流动力学]