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The restoration of open-pit mining coal mine areas is imminent, and it is of great significance to put forward a set of reasonable restoration concepts. According to the geographical location and economic conditions of the mining areas, this paper combines multiple restoration concepts and measures such as “fundamental reforestation”, “near-natural restoration”, “introduction of agricultural and forestry industries” and “development of cultural tourism in abandoned land” in a scientific way, the combination has been successfully applied in the restoration and comprehensive utilization project in an open-pit coal mine area in Datong, Shanxi, China. This concept realizes the reuse of abandoned open-pit coal mines and closely follows the national strategy of poverty alleviation and rural revitalization, in pursuit of the national vision of “clear waters and green mountains are mountains of gold and silver.”

By using “the method of modified two-variable”, “the method of mixing perturbation” and introducing four small parameters, the problem of the nonlinear unsymmetrical bending for orthotropic rectangular thin plate with linear variable thickness is studied. And the uniformly valid asymptotic solution of Nth-order for ɛ1 and Mth-order for ɛ2 of the deflection functions and stress function are obtained.

It has been reported that the reduced stiffness of non-homogeneous cylindrically orthotropic circular plate varing exponentially with radius r is obtained by using the bending theory of a simple beam.

To begin with, in this paper, the governing equations of the problem of the non-linear unsymmetrical bending for cylindrically orthotropic circular thin plate with variable thickness are derived. By using “the method of two-variable” and introducing four small parameters, the problem of the non-linear unsymmetrical bending for cylindrically orthotropic circular thin plate with linear variable thickness are studied, and the uniformly valid asymptotic solution of Nth-order for ɛ1 and Mth-order for ɛ2 are obtained.

In this paper, under the non-uniform transverse load, the problems of nonlinear bending for orthotropic rectangular plate are studied by using “the method of twovariable”[1] and “the method of mixing perturbation”[2]. The uniformly valid asymptotic solutions of Nth-order for ɛ1 and Mth-order for ɛ2 for orthotropic rectangular plate with four clamped edges are obtained.

In this paper, the problems of nonlinear unsymmetrical bending for cylindrically orthotropic circular plate are studied by using “the method of two-variable”[1], and the uniformly valid asymptotic solutions of Nth-order for e1 and Mth-order for e2 are obtained