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首页> 外文会议>International Symposium on Safety Science and Technology; 20061024-27; Changsha(CN) >Safety Assessment on Underground Opening due to Adjacent Tunnelling
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Safety Assessment on Underground Opening due to Adjacent Tunnelling

机译：邻近隧道对地下洞口的安全评估

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It has obviously effect on the safety and stability of underground opening owning to the excavation of an adjacent new working tunnel in vicinity of an existing opening. In order to ensure the safe exploitation of orebody resources, it is remarkably important to preserve the stability of constructed underground opening and constructing tunnel. In this study, the mutual effect of adjacent new working tunnel on surrounding rock stability of underground opening has been investigated by numerical analyses using ANSYS finite element code. It is shown that the stress distributions around new tunnels differ quantitatively and qualitatively owing to conditions of their location and distance relative to the opening contour. The excavation of new tunnels has a remarkable influence on the stress distribution in local roof zone of constructed underground opening. In order to assess the safety and stability of new tunnel and underground opening, the stress safety factor based on the Drucker-Prager yield criteria is put forward. By analyses of stress safety factor, it is recommended to arrange new working tunnel at a distance not closer than 20m from the roof boundaries of openings to ensure stability of openings and new working tunnels for the favoring exploitation.
机译：由于在现有洞口附近开挖了一条相邻的新工作隧道，因此对地下洞口的安全性和稳定性产生了明显影响。为了确保矿体资源的安全开采，保持已建地下洞口和施工隧道的稳定性非常重要。在这项研究中，通过使用ANSYS有限元代码的数值分析，研究了相邻新工作隧道对地下洞室围岩稳定性的相互影响。结果表明，新隧道周围的应力分布由于其相对于开口轮廓的位置和距离的条件而在数量和质量上有所不同。新开挖的隧道对已建地下洞室局部屋顶区域的应力分布有显着影响。为了评估新隧道和地下洞口的安全性和稳定性，提出了基于Drucker-Prager屈服准则的应力安全系数。通过对应力安全系数的分析，建议在距洞口顶板边界不超过20m处布置新的工作隧道，以确保洞口和新工作隧道的稳定性，以利于开发。

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