Investigation Of Mud Flow Mechanism In Mines And Numerical Simulation Under Coupled Solid-liquid Theory

Domestic non-pillar sublevel caving mining is the majority mines in our country and this kind of underground mining methods is a process of dynamic following dynamic change. The overlying material caved in sublevel caving mining by frequent disturbances and destruction and rush in the blasting-caused dynamic gap to the underground stope, mixed with the ore. During raining seasons, the saturated overlying waste materials in mined excavations may be liquified as loss of strength due to the dynamic excitation, such as blasting,. It can result in mud flow disaster due to sudden flow failures. If we can find it early and prevent, the economic losses will reduce and safety of personnel can be guaranteed. Referring to literatures about liquefaction mechanism home and abroad and the specificity of blasting and a large amount of data calculating through non-dimensional analysis, the mud flow mechanism is investigated in this paper and the coupled effect and mechanical response of the caved soil in saturation are evaluated via the simulation under blasting excitation as dynamic load. This may provide a fundamental basis for safe mine production in raining seasons and design parameters for sublevel caving. In this paper, the basic principle from numerical simulation had been introduced through analyzing the effect factors of soil liquefaction and decision method: Based on a dynamic non-linear coupled solid and liquid constitutive equation and numerical simulation methods, it researches various factors of non-dimensional through changing the other various on the platform of OPENSEES under blasting, and displays the results of non-dimensional figures. The results are validated with the cases from Chenchao Mine and agree with the real data.