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Analytical scrutiny of loosening pressure on deep twin-tunnels in rock formations

机译：岩层深部双隧道松动压力的分析研究

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摘要

Structual analysis of deep twin-tunnels is a cumbersome job due to the complex mechanism of tunnel-ground-tunnel interactions. This paper deals with the loosening pressure on the deep twin-tunnels. The deep twin-tunnel is divided into three patterns based on the different distributions of the failure zone. An analytical method is proposed to predict the surrounding rock pressure on deep twin-tunnels through the modification of the Protodyakonov's equilibrium arch theory (PEAT). The influences of the clear distance, reinforcement coefficient, excavation span and excavation height on the loosening pressure are discussed in some details. The obtained results by the proposed method are then compared with the in-situ monitoring data and a reasonably good agreement is achieved. The complementary studies suggest that the proposed approach is a trustable one for the preliminary design of deep twin-tunnels.
机译：由于隧道-地面-隧道相互作用的复杂机制，深双隧道的结构分析是一项繁琐的工作。本文探讨了深双隧道上的松动压力。根据故障区域的不同分布，深双隧道分为三种模式。提出了一种分析方法，通过对Protodyakonov平衡拱理论（PEAT）的修改来预测深双隧道的围岩压力。详细讨论了净距，钢筋系数，开挖跨度和开挖高度对松动压力的影响。然后将所提出的方法获得的结果与现场监测数据进行比较，并取得了合理的一致性。补充研究表明，对于深双隧道的初步设计，该方法是值得信赖的方法。

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