福建周宁水电站水压致裂地应力测量及其应用

›› 2004, Vol. 25 ›› Issue (10): 1672-1676.

福建周宁水电站水压致裂地应力测量及其应用

安其美，丁立丰，王海忠

中国地震局地壳应力研究所，北京 100085

收稿日期:2003-03-04 出版日期:2004-10-11 发布日期:2014-07-25
作者简介:安其美，男，1946年，副研究员，现主要从事地应力测量及其应用研究工作。

Research of crust stress measurement and its application with hydraulic fracturing in Zhouning Hydro-power, station of Fujian Province

Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085 ,China

Received:2003-03-04 Online:2004-10-11 Published:2014-07-25

摘要/Abstract

摘要： 周宁水电站在交通洞开挖过程中局部洞段发生了较强烈的岩爆。地下洞室和高压岔管、输水隧道设计及选择衬砌方式，需要查明原地应力状态。为此，采用水压致裂法在3个深钻孔中和岩爆部位进行了原位应力测量。结果表明，平面应力值随孔深增加呈线性增大；在岩爆和地下洞室附近，原位应力最大值为13～15 MPa，以水平挤压应力为主导，最大水平主应力方向为NW向。根据地应力测量资料和相关理论、判据分析认为：地下厂房长轴为NW向有利于围岩稳定；高压岔管和输水隧洞选用钢筋混凝土衬砌是可行的；发生局部岩爆，主要是由于隧道开挖围岩应力重新调整，在掌子面附近应力集中所致。

关键词: 水压致裂, 地应力, 衬砌, 岩爆

Abstract: A strong rockburst took place at one part of transportation tunnel at Zhouning Hydropower station while excavation. Underground tunnel, high pressure bifurcated pipe, water inlet tunnel designing and their lining style need know crustal stress too. So stress measurement with hydraulic fracturing was adopted in 3 deep drillholes from surface and in the rockburst measuring point. The results indicated that planar stress increased linearity with the depth of drillholes, the maximal value of crustal stress was 13－15 MPa near the site of rockburst and underground tunnel with the dominant horizontal extrusion direction NW. Based on the data of crustal stress and interrelated theory and criterion, it concluded that, first, major axis at NW direction was the best to underground plant building’s stability; secondly, reinforced concrete lining was practicable in high pressure bifurcated pipe and water inlet tunnel, thirdly, the reason why local rockburst took place was that stress concentration came into being near tunnel heading for stress in wall rock readjusted during tunnel excavation.

Key words: Kydraulic fracturing , crust stress；lining；rockburst

中图分类号:

TV223.1

安其美，丁立丰，王海忠. 福建周宁水电站水压致裂地应力测量及其应用[J]. , 2004, 25(10): 1672-1676.

Research of crust stress measurement and its application with hydraulic fracturing in Zhouning Hydro-power, station of Fujian Province. Research of crust stress measurement and its application with hydraulic fracturing in Zhouning Hydro-power, station of Fujian Province[J]. , 2004, 25(10): 1672-1676.

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