Modeling the Seismic Stability of Coal-Waste Tailings Dams

9527387增煤处理废渣坝用于储存煤泥，因此与更广泛的尾矿坝结构有许多共同之处。尾矿坝的特点是用水力方式放置的填充物由堤坝固定在适当的位置。过去，由于地震而导致的尾矿库坍塌事件曾多次发生，造成重大的财产和生命损失以及严重的环境问题。尽管这种破坏造成了破坏，但很少有人进行研究来评估这种结构在地震荷载下的稳定性。煤矸石是一种对循环荷载敏感的细粒材料。过高的孔压，以及在最糟糕的情况下尾矿的液化，会对支撑路堤造成巨大的压力，并引发灾难性的破坏。该项目使用土工离心机模拟技术来研究煤尾矿坝的破坏机理，并为评估当前的设计程序产生物理数据。本项目涉及：1.按目前实际使用的两种不同施工方法建造的尾矿坝的两次离心机试验；2.将离心机试验数据与数值模拟结果进行比较。本研究结果将为工程技术人员提供有关现有尾矿库稳定性的有价值的信息，并为今后的设计改进提供指导。硬盘/数据/文件/奖项/奖项-96财年/曾-9527387*

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 ***