中文摘要：

当地下的采矿发生在下面时，这份报纸提供最低溪谷和沙的土壤溪谷的运动机制的改进理解，由象采矿进展方向，溪谷斜坡角度，溪谷侵蚀系数和采矿高度那样的作出贡献的因素的系统的分析列在后面。这份报纸从监视，理论分析并且基于在溪谷的地质的特征的最新的建模论述结果到房顶的成功的这些结果的影响区域，和含意支持试用。当采矿向溪谷发生了时，沿着破裂表面斜坡块滑动发生了，这被观察，它导致了不稳定的房顶状况；当采矿进行了离开溪谷时，多角形块在溪谷斜坡发展了并且在形成依赖结构的颠倒的方向旋转了；在最低斜坡以内，依赖结构是不稳定的由于砍多角形块的失败；在沙的土壤斜坡以内，然而，结构由于多角形块的渐渐的旋转并且减退是相对稳定的。斜坡角度和采矿高度的值的增加在溪谷斜坡以内导致更快、更集中的破裂开发，它在溪谷斜坡稳定性和地下的压力上有显著效果。各种各样的补习途径因此包括介绍更强大的支持和合理采矿高度在这份报纸被建议，建立工作的脸沿着或离开溪谷，用空间和支柱，剥去采矿和装填而不是 longwall 采矿。

英文摘要：

This paper provides an improved understanding of the movement mechanisms of both bed-rock gully and sandy soil gully when underground mining occurs underneath, followed by systematic analysis of the contributing factors such as mining advance direction, gully slope angle, gully erosion coefficient and mining height. This paper presents the results from monitoring, theoretical analyses and up to date modeling based on the geological features in the gully affected area, and the implications of these results to the success of roof support trial. It was observed that when mining occurred towards the gully, sliding of slope block along the fracture surface occurred, which resulted in unstable roof condition; when mining progressed away from the gully, polygon blocks developed in the gully slope and rotated in reversed direction forming hinged structure; within the bed-rock slope, the hinged structure was unstable due to shear failure of the polygon block; however, within the sandy soil slope, the structure was relatively stable due to the gradual rotating and subsiding of the polygon block. The increase of the value of slope angle and mining height lead to a faster and more intensive fracture development within the gully slope, which had a pronounced effect on gully slope stability and underground pressure. Various remediation approaches are hence proposed in this paper including introducing more powerful support and reasonable mining height, setting up working face along or away from gullies, using room and pillar,strip mining and backfill instead of longwall mining.