Seismic Response Analysis Of The Center-line Tailing Dam

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.