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Stability evaluation of the sequential excavation method of large-section double-arch tunnel in fly ash accumulation stratum through physical model
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-17 , DOI: 10.1016/j.tust.2025.106391
Tao Yu, Kaichen Ying, Jianfeng Wang, Zhigang Yao, Yong Fang
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-17 , DOI: 10.1016/j.tust.2025.106391
Tao Yu, Kaichen Ying, Jianfeng Wang, Zhigang Yao, Yong Fang
There is no precedent for the construction of large-section double-arch tunnels in fly ash accumulation stratum in China. The fly ash stratum is characterized by a loose structure, poor cementation, and low bearing capacity, which present significant challenges in tunnel design and construction. Based on the Yanpingba tunnel project, this paper conducts a model test on a large-section double-arch tunnel crossing a fly ash accumulation stratum, analyzing the tunnel’s mechanical behavior under various sequential excavation methods. The results show a large settlement of the vault and upper stratum of the double-arch tunnel excavated in the fly ash accumulation stratum. In addition, the stratum can easily become unstable, so it is necessary to reinforce the stratum by grouting. Compared with the subsequent tunnel, the advance tunnel is more affected by excavation, and the risk of structural damage is higher. Compared with the central diaphragm (CD) method and the bench method, the single side drift method is more conducive to safe construction. A mid-partition wall can effectively reduce the settlement of the stratum, but it is easily deflected to the side by the bias pressure. Adding support on the side of the advance tunnel of the mid-partition wall is recommended.
中文翻译:
通过物理模型评价粉煤灰堆积层中大断面双拱隧道序开挖法的稳定性
我国在粉煤灰堆积层中建造大断面双拱隧道尚无先例。粉煤灰地层结构松散、胶结性差、承载力低,给隧道设计和施工带来了重大挑战。本文以盐坪坝隧道工程为基础,对穿越粉煤灰堆积层的大断面双拱隧道进行了模型试验,分析了隧道在各种序贯开挖方法下的力学行为。结果表明,在粉煤灰堆积层中挖掘的双拱隧道的拱顶和上层存在大量沉降。此外,地层很容易变得不稳定,因此有必要通过灌浆来加固地层。与后续隧道相比,前进隧道受开挖影响更大,结构损坏的风险更高。与中心隔膜 (CD) 法和台架法相比,单侧漂移法更有利于安全施工。中间隔墙可以有效减少地层的沉降,但很容易被偏置压力偏向一侧。建议在中间隔墙的推进通道的一侧添加支撑。
更新日期:2025-01-17
中文翻译:
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通过物理模型评价粉煤灰堆积层中大断面双拱隧道序开挖法的稳定性
我国在粉煤灰堆积层中建造大断面双拱隧道尚无先例。粉煤灰地层结构松散、胶结性差、承载力低,给隧道设计和施工带来了重大挑战。本文以盐坪坝隧道工程为基础,对穿越粉煤灰堆积层的大断面双拱隧道进行了模型试验,分析了隧道在各种序贯开挖方法下的力学行为。结果表明,在粉煤灰堆积层中挖掘的双拱隧道的拱顶和上层存在大量沉降。此外,地层很容易变得不稳定,因此有必要通过灌浆来加固地层。与后续隧道相比,前进隧道受开挖影响更大,结构损坏的风险更高。与中心隔膜 (CD) 法和台架法相比,单侧漂移法更有利于安全施工。中间隔墙可以有效减少地层的沉降,但很容易被偏置压力偏向一侧。建议在中间隔墙的推进通道的一侧添加支撑。