Correlation of subsidence parameters and damage assessment due to underground mining

摘要

The impacts of underground mining on the surface are important environmental considerations in the permission and planning of mining operations. As a results, the development of rigorous and well accepted damage criteria, for assessing mining impacts on surface structures and facilities, is an important issue in subsidence control. This task can be extremely complex due to the numbe and nature of the parameters affecting ground deformation induced by underground mining, as well as the interaction of geotechnical and structural factors determining the response of structures to such movements. In tis paper, relationships are established between characteristic subsidence parameters, (i.e., andle of draw, angle of damage) and damage criteria, i.e., the threshold tolerance values for realizing a particular damage levels. The analytical work is based on the Surface Deformation Prediction System (SDPS), which was developed in the eastern U.S.A based on an influence function formulation. This method has been extensively validated using actual subsidence and horizontal strain measurements. The influence of both mining and geological factors, such as mining width, depth and gheight and overburden lithology, on damage prediction and assessment are also addressed. Finally, the nothion of a "measurable" movement and it effect on assessing subsidence related damages is discussed.