Finite element modelling of the three-dimensional ground deformations due to tunnelling in soft cohesive soils: Part 2 — results
Finite element modelling of the three-dimensional ground deformations due to tunnelling in soft cohesive soils: Part 2 — results
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DOI：
10.1016/0266-352x(90)90002-d
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发表时间：
1990
影响因子：
5.3
通讯作者：
K. Lee;R. K. Rowe
中科院分区：
文献类型：
--
作者：
K. Lee;R. K. Rowe
为了理解浅埋隧道的三维行为，我们研究了一种假设的情况，这种情况涉及到相对简单的隧道几何形状和土壤条件。在两种理想的极限情况下(i)无衬砌隧道和（ii）完全衬砌隧道，研究了隧道表面周围和地表的三维地面位移和应力模式的结果。从这两个理想的情况下的发现将涵盖一个完整的施工模拟的响应。分析结果表明，掘进巷道周围的一般三维应力和位移模式与平面应变横截面上的应力和位移模式有很大的不同。地面位移达到平面应变状态所需的距离将取决于隧道开口周围发育的塑性量。讨论了三维隧道分析结果的实际意义。
For the purpose of understanding the three-dimensional behaviour of a shallow tunnel, a hypothetical situation which involves a relatively simple tunnel geometry and soil conditions is examined. The results of three-dimensional ground displacements and stress pattern around a tunnel face and at the ground surface are examined for two idealized limiting situations: (i) an unlined tunnel, and (ii) a perfectly lined tunnel. The findings from these two idealized cases will bracket the response of a full construction simulation. Results obtained from these analyses indicate that the general three-dimensional stress and displacement patterns around a tunnel heading are very different from that at the plane strain transverse section. The distance required for the ground displacement to reach the plane strain condition will depend on the amount of plasticity developed around the tunnel opening. Practical implications of the results obtained from these three-dimensional tunnel analyses are discussed.