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The Effect Of Erosion Voids On Existing Tunnel Linings

机译：侵蚀空洞对现有隧道衬砌的影响

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摘要

Erosion voids may develop around buried infrastructures due to several reasons including water infiltration into leaking joints, dissolution of Karst limestone, and dynamic loading caused by construction related activities. This study evaluates the effect of erosion voids developing in the close vicinity of existing tunnels on the circumferential stresses in the lining. A series of simplified void geometries are defined beside and under the lining. Elasto-plastic finite element analyses are performed to study how those voids influence thrust forces and bending moments in the lining. The role of other factors such as the lining flexibility and in situ stress conditions is also investigated. Depending on the flexibility ratio between the lining and the surrounding soil, the void size can have a significant impact on the circumferential stresses in the tunnel lining. A void under the invert leads to decrease in the magnitude of bending moment, and for large void size, the moments can reverse sign. This preliminary study suggests that efforts to arrest the growth of erosion voids at the invert and springline should be made before the voids reach this size. All results presented are theoretical in nature, and physical testing is needed to evaluate the performance of these calculations.
机译：由于多种原因，埋入的基础设施周围可能会形成侵蚀空洞，包括渗入渗漏缝中的水，岩溶石灰岩的溶解以及与施工有关的活动引起的动态载荷。这项研究评估了在现有隧道附近形成的侵蚀空洞对衬砌中周向应力的影响。在衬里的旁边和下面定义了一系列简化的空隙几何形状。进行了弹塑性有限元分析，以研究这些空隙如何影响衬砌中的推力和弯矩。还研究了其他因素（如衬里的柔韧性和原位应力条件）的作用。根据衬砌和周围土壤之间的柔韧性比，空隙尺寸可能会对隧道衬砌的周向应力产生重大影响。倒置下方的空隙会导致弯矩的大小减小，而对于较大的空隙尺寸，力矩会使符号反转。这项初步研究表明，应在孔隙达到此尺寸之前，努力阻止侵蚀孔隙在反演和弹簧线上的生长。给出的所有结果本质上都是理论上的，需要物理测试才能评估这些计算的性能。

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