土工基础

›› 2018, Vol. 32 ›› Issue (2): 189-193.

• 工程实录 • 上一篇    下一篇

N-J水电站引水隧洞大变形段长期稳定性分析

胡泉光，熊浩森，刑秦智   

  1. （中国葛洲坝集团第三工程公司，西安 710000）
  • 收稿日期:2017-07-13 修回日期:2017-07-19 出版日期:2018-04-30 发布日期:2018-05-09
  • 作者简介:胡泉光（1971-），男，高级工程师，研究方向为水电工程项目管理。

Numerical Analysis of the Long-term Stability of the Water Diversion Tunnel of N-J Hydropower Station

 HU  Quan-Guang, XIONG  Hao-Sen, XING  Qin-Zhi   

  1. (No. 3 Engineering Co., Ltd., China Gezhouba Group, Xi′an 710000)
  • Received:2017-07-13 Revised:2017-07-19 Online:2018-04-30 Published:2018-05-09

摘要： 深埋软岩隧洞围岩蠕变特性将会对隧洞的长期稳定性产生重要影响。以巴基斯坦N-J水电站深埋引水隧洞的泥质粉砂岩为研究对象，通过室内的三轴蠕变试验，建立了适用于该岩石的幂指数蠕变模型。通过对大变形段围岩变形监测结果的反演分析，得到了围岩体的蠕变参数，并基于此对引水隧洞软岩大变形段的长期稳定性进行了分析。结果表明，引水隧洞运营10年后，围岩的拱顶下沉增量为20.3 mm，水平变形增量为18.1 mm，衬砌的受力主要以压应力为主，最大压应力达到了63.4 MPa，主要出现在拱顶和拱腰部位，出现了局部的受压破坏，为保证隧洞安全，需在拱顶和拱腰部位进行加强支护。

关键词: 蠕变, 软岩, 变形预测, 长期稳定性

Abstract: The rheological properties of the soft rock mass have a significant impact on the longterm stability of a deep buried tunnel. This paper presents the triaxial creep test results on argillaceous siltstone samples from Pakistan NeelumJhelum hydropower project. An index rheological relationship was developed based on the test results. The parameters of the relationship were back analyzed from the construction monitoring results on the rock mass during the water diversion tunnel excavation. The calibrated parameters were used in the longterm stability analysis of the tunnel structure. The results indicate that, after 10 years of tunnel operation, the vertical deflection at the crest of the tunnel is 20.3 mm and the horizontal deformation is 18.1 mm. The stress in the lining structure is predominantly compressive with a maximum compressive stress is 63.4 MPa, which located at the crest and middle portions of the tunnel. From these analyses, lining strengthening measure should be taken.

Key words: Rheological Properties, Soft Rock, Deformation Estimation, Longterm Stability