Study on acceptable minimum interval of long deeply burial hydropower tunnels in Jinping II hydropower station

JIANG Quan; FENG Xia-ting; ZHOU Hui

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Study on acceptable minimum interval of long deeply burial hydropower tunnels in Jinping II hydropower station

更新时间：2026-06-25

- Study on acceptable minimum interval of long deeply burial hydropower tunnels in Jinping II hydropower station
- Vol. 29, Issue 3, (2008)
- 作者机构：
  
  中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉,430071
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU451
- Online First：19 July 2013，
  
  Published：2008
- 稿件说明：
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JIANG Quan, FENG Xia-ting, ZHOU Hui. Study on acceptable minimum interval of long deeply burial hydropower tunnels in Jinping II hydropower station[J]. 2008, 29(3).
DOI：

JIANG Quan, FENG Xia-ting, ZHOU Hui. Study on acceptable minimum interval of long deeply burial hydropower tunnels in Jinping II hydropower station[J]. 2008, 29(3). DOI：

摘要

锦屏二级水电站引水隧洞群最大的特点是埋藏深、地应力高、外水压力大。这一极端复杂的赋存环境给4条引水隧洞的中心线间距确定带来了很大的挑战。为此，首先通过流-固耦合的数值计算方法，对洞间岩体塑性区贯通与否、隧洞壁面关键点位移曲线拐点、收敛位移是否超出相关规范共3种判别标准进行分析后，得到引水隧洞群最小理论间距值为50 m。进而在类比与引水隧洞本身相邻的辅助洞和国内外几个典型深埋隧洞的洞径、埋深和间距的基础上，综合确定深埋引水隧洞群的最小允许中心线间距为52 m，为当前设计采用60 m洞间距提供了有力的理论支持。

Abstract

The four hydropower tunnels of Jinping II Hydropower Station are mostly over burden of 2000 m

surrounded by more than 44.2MPa high initial stress and 10MPa pore water pressure. It is a great challenge for designers to determine the acceptable minimum interval under extremely complex geological conditions. So a integrated criterion for determining acceptable minimum interval is proposed according to (1) the plastic zone connecting or not; (2) the inflexion of displacement curve of key points in tunnel. (3) convergence displacement not exceeding the state specification. With above guidelines

the theoretical minimum interval of tunnel of 50 m is obtained

by hydro-mechanics coupling numerical simulation. At last

the modified result of 52 m is recommended for the acceptable minimum interval according to engineering analogy analysis of several typical deep tunnels. The conclusion shows that the design interval of 60 m at present is reasonable.

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