Comparative Analysis of Excavation Schemes for a Tunnel Constructed through Loose Deposits
Comparative Analysis of Excavation Schemes for a Tunnel Constructed through Loose Deposits
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DOI：
10.1061/(asce)cf.1943-5509.0000813
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发表时间：
2016-08
影响因子：
2.5
通讯作者：
J. Z. Xiao;F. Dai;Y. Wei;Y. C. Xing;H. Cai;Chong Xu
中科院分区：
文献类型：
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作者：
J. Z. Xiao;F. Dai;Y. Wei;Y. C. Xing;H. Cai;Chong Xu
摘要松散堆积层隧道由于围岩软弱，易发生垮塌，二次衬砌变形过大。因此，选择合适的开挖方案至关重要，这将影响隧道的施工安全和后续的隧道运营。本文以浅埋于洪积松散沉积物中的公路隧道亭子坝隧道为例。在施工过程中，该隧道经历了多次拱顶坍塌和超前支护破坏。采用各向同性固结排水（CD）压缩试验对重建试样进行了压缩试验，获得了松散沉积物的力学参数。采用上下台阶法、三台阶法和单侧掘进法三种不同的开挖方案，对隧道开挖后的应力和变形分布进行了三维模拟。对比分析结果表明，…
AbstractBecause of weak surrounding rock, tunnels constructed in loose deposits are prone to collapse, and secondary linings commonly suffer excessive deformation. Therefore, it is important to select an appropriate excavation scheme, which will affect both tunnel construction safety and subsequent tunnel operations. This paper takes the Tingziba tunnel, a highway tunnel shallowly buried in loose deposits of diluvial and proluvial origin, as an example. During construction, this tunnel experienced many instances of vault collapse and advanced support destruction. Isotropically consolidated drained (CD) compression tests were carried out on reconstituted specimens to obtain the mechanical parameters of the loose deposits. Three-dimensional modeling was performed to simulate stress and deformation distributions in the tunnel after excavation by three different schemes, i.e., up and down bench tunneling, three-bench tunneling, and single-side heading tunneling. The comparative analysis results showed that si...