Modeling the Seismic Stability of Coal-Waste Tailings Dams

煤矸石尾矿坝的地震稳定性建模

• 批准号: 9527387
• 负责人: Xiangwu Zeng
• 金额: $ 4.98万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527387&HistoricalAwards=false
• 关键词: Modeling; Seismic; Stability; Coal; Waste

9527387 Zeng Coal processing waste dams are used to store coal slurry, and as such have many characteristics in common with a broader class of structures known as tailings dams. Tailings dams are characterized by hydraulically placed fills held in place by an embankment. Failure of tailings dams due to earthquakes has occurred many times in the past, causing significant loss of property and human lives as well as severe environmental problems. Despite the damage caused by such failures, there has been little research conducted to evaluate the stability of such structures under earthquake loading. Coal waste is a fine grained material which is sensitive to cyclic loading. High excess pore pressure, and in the worst scenario liquefaction of the tailings, can cause large pressure on the supporting embankment and initiate catastrophic failure. This project uses a geotechnical centrifuge modeling technique to study the mechanism of failure of coal-waste tailings dams and to generate physical data for the evaluation of current design procedures. The project involves: 1. Two centrifuge tests on tailings dams constructed according to two different construction methods currently used in practice 2. Comparison between the data from centrifuge tests with the results obtained from numerical simulation The results of this study will provide engineers with valuable information concerning the stability of existing tailings dams and guidelines for improvement of future designs. HD/ Data/ Files/ Awards/ Award-FY 96/ Zeng-9527387 ***

煤炭加工废料坝是用来储存煤浆的，因此与被称为尾矿坝的更广泛的结构类型有许多共同的特点。尾矿坝的特点是水力放置的填充物由堤防保持到位。由于地震造成的尾矿坝破坏在历史上曾多次发生，造成了重大的财产损失和人员生命损失，也造成了严重的环境问题。尽管这种破坏造成了破坏，但很少有研究对这种结构在地震荷载下的稳定性进行评估。煤矸石是一种对循环载荷敏感的细粒物料。过高的超孔隙压力，以及尾矿液化的最坏情况下，会对支护路堤造成较大压力，引发灾难性破坏。本项目采用土工离心机建模技术，研究废尾矿坝破坏机理，生成物理数据，对当前设计程序进行评价。该项目包括：1；根据目前实践中采用的两种不同施工方法对尾矿坝进行了两次离心试验。离心试验数据与数值模拟结果的比较研究结果将为工程人员提供有关现有尾矿坝稳定性的宝贵信息，并为今后的设计改进提供指导。HD/ Data/ Files/ Awards/ Award-FY 96/ Zeng-9527387 ***