安康膨胀土隧道的设计和施工

张永平

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铁道工程学报 ›› 2013, Vol. 30 ›› Issue (10) : 77-80.

隧道工程

安康膨胀土隧道的设计和施工

张永平

作者信息 +

Design and Construction of Expansive Soil Tunnel in Ankang

ZHANG Yong-Pig

Author information +

文章历史 +

摘要

研究目的:针对安康地区强膨胀土在既有隧道施工及运营过程中对初期支护及衬砌结构产生较大的破坏作用，结合襄渝线增建第二线安康地区新七里沟强膨胀土隧道设计及施工的典型实例，通过数值模拟及现场测试分析，探索适宜强膨胀土隧道的设计及施工方法，解决膨胀土隧道施工过程中，初期支护变形开裂，二次衬砌裂损的难题，为铁路及公路隧道在强膨胀土隧道中施工提供理论及实践依据。

研究结论:(1)强膨胀土隧道在开挖过程中其膨胀压力常具有不对称性，开挖后土体早期变形较大，宜适当加大预留变形量并采用较大刚度的初期支护且及早封闭成环;(2)三台阶预留核心土的施工方法适用于强膨胀土隧道的施工，椭圆形钢筋混凝土衬砌结构合理能抵御较大膨胀压力，确保衬砌结构安全;(3)本研究成果可在安康及其他强膨胀土地区隧道设计及施工中推广应用。

Abstract

Research purposes: Aiming at the strong expansive soil in Ankang area to cause the large damage to the initial support and tunnel lining during the construction and operation，and compared with the typical case of design and construction of expansive soil tunnel of the second railway line from Xiangfan to Chongqing in AnKang area, the numerical simulation and field test were done and the discussion was made on suitable the design and construction method for the strong expansive soil tunnel to solve the problems of the cracking and deformation of the initial support and the cracking damage to the tunnel lining during the construction of expansive soil tunnel and provide theoretical and practical basis for construction of the strong expansive soil tunnel of railway and highway.

Research conclusions:(1)During excavation of strong expansive soil tunnel，the expansive pressure is dissymmetrical to cause the large deformation in the early stage of tunnel excavation. Therefore，the allowable deformation volume should be increased properly，the initial support with higher stiffness should be used and closed into loop as soon as possible. ( 2)The construction method of three-bench and reservation of core soil is available for construction of strong expansive soil tunnel. If the structure of oval reinforced concrete tunnel lining is reasonable，it can withstand the larger expansive pressure to make the lining structure safe.(3)This research result can be applied widely in tunnel design and construction of the strong expansive soil tunnel in Ankang and other similar areas.

导出引用

张永平. 安康膨胀土隧道的设计和施工[J]. 铁道工程学报, 2013, 30(10): 77-80

ZHANG Yong-Pig. Design and Construction of Expansive Soil Tunnel in Ankang[J]. Journal of Railway Engineering Society, 2013, 30(10): 77-80

中图分类号： U457+.2

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