Characteristics of In-situ Stress Field in Dahuofang Reservoir Conveying-Water Tunnel
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摘要: 为了解大伙房水库输水隧洞地应力场分布对洞室围岩稳定性的影响,采用地质力学方法研究了该区构造形迹特征,阐明了地应力场演化特征,首次将应力场演化划分为4个期次,并结合实测地应力数据建立了工程区地应力场分布模型。结果表明该区是以水平残余构造应力为主的中应力区,最大水平主应力方向为近EW,与洞轴线夹角为39°~46°,对围岩稳定性影响较大。Abstract: In order to find out whether the in-situ strees field affects rock mass stability in the area of Dahuofang reservoir conveying-water tunnel,geomechanics is applied to study the tectonic appearance.The evolution of stress field is clarified and divided into four stages firstly.Furthermore, based on the data measured,the distribution model of in-situ stress field is set up.The results indicate that this region is in middle horizontal tectonic stress field and the orientation of major principal stress is nearly EW. The angle belween maximum principal stress and tunnel axes is 39-46° which affects rock masses stability.
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