Abstract: Mining beneath riverbed is a technical problem involved with the security of both mining and the environment. The dynamical unbalance of covering rocks above the mining hollow, which is brought from disorder from mining, is quite apt to turn into derivational calamity. This kind of unbalance behaves as a dynamical process with temporal domino offect. Based on simulating experiments on similar material, our study analyzes and forecasts the destroy pattern of covering rock fracture and earth's surface movement brought from mining. The conclusion of our study provides potent support for the design of mining scheme of L3414 integrated mining working-face beneath the Xitianhe riverbed, and leads to practical secure mining eventually.