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中文摘要：
当前随着对矿产资源需求的增加和开采强度的不断加大，浅部资源日益减少，露天开采矿山不断向深部及地下开采转移，国内外多座矿山相继进入露天与地下联合开采状态。因此如何确定露天地下联合开采矿山保留层厚度是个重要且有待解决的问题。应用数值分析，根据在同一剖面矿房不同顶板线位置，矿房上方同一个点的位移收敛情况，建立确定露天地下联合开采保留层厚度的位移收敛判据。并应用该法对某大型矿山进行了分析。确定了露天与地下联合开采的安全隔离层厚度，为安全开采提供了技术依据。
英文摘要：
With the present increasing demand on mineral resources, enhancing mining strength and decreasing shallow resources, open-pit mines are going towards the depth and transiting to the underground mining, with many foreign and domestic mines now being in the open-pit and underground combined mining status. Therefore, how to determine the thickness of the reservation layer in such a mining system is an important yet to be solved problem. Using numeric analysis and according to the displacement convergence condition at the same point above the mining room for the same cross section at different roof positions ,the displacement convergence criterion for the rational thickness of the reservation layer in an openpit and underground combined mining system was established, which was used in the analysis of a large mine, where the safety isolation layer was determined for the system, providing a technical basis for the safety mining.
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