Abstract
Sub-rectangular tunnel cross-sections are commonly used in underground engineering projects. However, very limited studies have dealt with the design of this kind of non-circular tunnels. In this paper, taking a twin-lane metro tunnel as an example, the optimization process of sub-rectangular tunnels in terms of tunnel lining forces is presented using the Hyperstatic Reaction Method (HRM). A series of mathematical functions considering the tunnel shape are used and the optimization of sub-rectangular tunnels shape is deduced. The effect of different parameters, such as the coefficient of lateral earth pressure at rest K0, Young’s modulus Es of soil, tunnel depth C, surface loads P0 on the internal forces and shape of sub-rectangular tunnel is then investigated.
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