采矿外文翻译受开采影响地表向剪切变形.docxVIP

翻译部分 英语原文 ON MINING-INDUCED HORIZONTAL SHEAR DEFORMATIONS OF THE GROUND SURFACE Gang Li1, Robert Pâquet1, Ray Ramage1 and Phil Steuart1 ABSTRACT: Horizontal shear deformations have not been commonly considered in subsidence engineering and risk management practices. This situation is quite different from many other engineering disciplines. This article presents the authors’ initial findings of case studies from a number of collieries across all NSW Coalfields. The objective of this article is to highlight the significance of a ground deformation mode, that is, horizontal shear, and its implications to subsidence engineering and risk management. A Shear Index is suggested to facilitate studies of mining-induced shear deformations of the ground surface. INTRODUCTION This article presents an argument that conventional subsidence parameters specifying horizontal deformations, in particular, horizontal strains (i.e. change in length), are inadequate for subsidence engineering and risk management. The above-mentioned inadequacy can become practically important in areas where only low magnitude of conventionally defined horizontal strains is detectable due to deep cover depths (or relatively low “extraction width-to-cover depth” ratios). Through the preliminary investigation of a number of coals in NSW, the study found there is clear evidence to suggest that the above-mentioned inadequacy is related to a lack of understanding of mining-induced horizontal deformations of the ground surface, in particular, horizontal shear deformations. Despite theoretical definitions found in limited literature on mine subsidence (e.g. 1992), horizontal shear deformations have not been commonly considered in subsidence engineering and risk management practices. This situation is quite different from many other engineering disciplines. HORIZONTAL SHEAR DEFORMATIONS When two adjacent cross sections of a stem has a pair of horizontal force perpendicular to stem axis but works in the opposite