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岩体初始地应力场是研究地下洞室围岩稳定状况和隧洞选线的重要依据。应用水压致裂法对秦岭北缘某深埋引水隧洞应力进行测定,结果显示隧洞围岩应力等级属于中低~高应力水平,应力量值呈σ_H>σ_h>σ_z特征,最大水平主应力方向为近NE向,与区域构造主压应力方位接近一致。基于实测数据,对工程区应力场进行回归反演,并结合区域构造应力对隧道沿线的深埋和浅埋段应力场分布规律进行了研究,以期为引水工程的设计和施工提供参考。
The initial geostress field of rock mass is an important basis for studying the stability of surrounding rock of underground caverns and the route selection of tunnel. The stress of a deep-buried diversion tunnel in the northern Qinling Mountains was measured by hydraulic fracturing. The results show that the stress level of the surrounding rock of the tunnel belongs to low to high stress level, and the stress value is σ_H> σ_h> σ_z. The maximum horizontal principal stress direction Is near NE direction, and is consistent with the principal compressive stress azimuth of regional tectonics. Based on the measured data, the stress field in the engineering area is retrieved by regression, and the distribution of stress field along the deep buried and shallow buried sections along the tunnel is studied with the regional tectonic stress in order to provide reference for the design and construction of the diversion project.