摘要
云南迪庆矿业公司羊拉铜矿拟在矿区内建一座新尾矿库,该地区为7度地震区,按照初步设计该尾矿库采用中线法堆坝,尾矿坝的设计总高185m,为我国第二座中线法高堆坝尾矿库。本文以该尾矿库工程为研究对象,采用室内试验和数值模拟技术,对中线法高堆坝在地震作用下的动力响应特性进行了系统研究。完成的主要工作和取得的科研成果如下:
①按照中线法堆坝工艺要求,配制了堆坝用的粗尾矿和入库的细尾矿。对粗尾矿、细尾矿和全尾矿三种试样的基本物理性质和工程力学性质进行了试验测试。研究了尾矿颗粒的组成与分布、渗透性、压缩性,采用直剪试验和三轴剪切试验对三种尾矿样的强度特性进行研究。
②采用DDS-70微机控制电磁式振动三轴仪对三种尾矿试样的动力特性进行了试验研究。包括材料的动本构关系、动弹模阻尼比和动强度等。探讨了颗粒组成、固结围压、固结压力比、动应力对动强度的影响。
③动三轴试验结果表明,粗尾矿的抗震稳定性比全尾矿和细尾矿要好。
④利用数值模拟技术对中线法高堆坝的动力响应进行了分析,研究了在Ⅷ级地震作用下坝体不同部位的水平加速度、水平位移和孔压的变化发展规律。
⑤数值模拟结果显示,该尾矿坝在Ⅷ级地震作用下并未出现液化现象;坝体全局最大位移中心出现在坝坡面中下部。
Yang-La copper of Yun Nan Di Qing mining company wants to build a new tailings reservoir in mining area which is in seven-degree seismic region. According to preliminary design, the central line damming will be built. The tailing dam is designed with height of 185m, which is the second high-central line tailing dams in our country. In this paper, tailing dam engineering is set as research object. The laboratory test and numerical simulation technology are used to study the dynamic responding characteristics of central line damming under seismic action. The main research work and achievements are as follows:
①According to the request of central line damming, the coarse tailing sands and fine tailing sands are made up. The basic physical properties and engineering mechanical properties of tailing sands、coarse tailing sands and fine tailing sands are tested. The composition and distribution, permeability and compressibility of tailing sands particle are also studied. The strength characteristics of three samples of tailing sands are studied by direct Shear Test and triaxial shear test.
②The DDS-70 electromagnet kinetic equipment is used to study the dynamic characteristics of three samples of tailing sands, including dynamic strength, stress-strain relation, the dynamic modulus and damping ratio. Some affecting factors such as particle composition, consolidated pressure, consolidated stress ratio and dynamic stress are discussed.
③The test result of cyclic triaxial shows that the seismic stability of coarse tailing sands is better than that of coarse tailing sands and fine tailing sands.
④Numerical simulation technology is applied for analysis of the dynamic responding of central line tailings damming. The horizontal acceleration, horizontal displacement and pore-pressure changing rules at different places of dam under M 8.0 seismic action are analyzed.
⑤The numerical simulation result indicates that there is no liquefaction phenomenon on the tailing dam under M 8.0 earthquake. And the global maximum displacement center is in the lower slope surface.
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