北天山构造演化中3阶段地应力变化及对某地下工程岩爆灾害分布的影响  

Three Stages of the Tectonic Evolution of the North Tianshan Mountains and the Distribution Characteristics of Rockburst Hazards in an Underground Project

作　　者：吴彤[1] 滕杰[1] 尚彦军[2,3,4] 邵鹏 闫晓石 荆理 Wu Tong;Teng Jie;Shang Yanjun;Shao Peng;Yan Xiaoshi;Jing Li(China Water Resources Beifang Investigation,Design and Research Co.Ltd.,Tianjin,3002222,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China;University of Chinese Academy of Sciences,Beijing,100049,China;Xinjiang Key Laboratory of Geohazard Prevention(Xinjiang Institute of Engineering),Urumqi,830023,China)

机构地区：[1]中水北方勘测设计研究有限责任公司,天津300222 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国科学院大学,北京100049 [4]新疆地质灾害防治重点实验室(新疆工程学院),新疆乌鲁木齐830023

出　　处：《新疆地质》2022年第4期528-533,共6页Xinjiang Geology

基　　金：科技部科技基础资源调查专项(2018FY100503);科技部第二次青藏高原综合科学考察研究项目(2019QZKK0904)共同资助。

摘　　要：北天山复杂的地质构造及多期演化使地应力方向和数值多变。在极高地应力区的深埋花岗岩施工中发生了较大范围的岩爆,影响地下工程施工安全。通过对地质构造发育和不同方向结构面配套分析,将北天山构造演化过程中地应力分为3个阶段,最大主应力由NE向、NW向转为近NS向。不同深度和不同时期地层岩体记忆残留了3个不同阶段地应力信息。采用水压致裂等方法在地面钻孔和洞内测试,结果显示最大主应力数值随深度不是线性增加,是在600~1200 m深度呈接近45 MPa局部峰值。研究发现,地应力测试结果与钻孔饼状岩心和洞内中-强岩爆不是发生在埋深最大位置,而是发生于该峰值段深度上的花岗岩体中。说明了地质构造控制作用及3阶段地应力叠加作用的影响。The complex geological structure and its multistage evolution in the North Tianshan Mountains make the direction and value of geostress varable.A large range of rockburst occurred in the construction of deep buried granite in the extremely high ground stress area,affecting the safety of underground engineering construction.Based on the analysis of geological structure development and structural planes in different directions,the geostress in the tectonic evolution process of North Tianshan Mountains is divided into three stages,and the maximum principal stress is changed from NE and NW to near SN.The rock mass memory of strata at different depths and at different periods retained the information of the three different stages of geostress.The maximum principal stress does not increase linearly with depth,but presents a high peak nearly 45MPa in a depth of 600-1200m.The study found that such in-situ stress test results and dill hole cake core and mid-high rockburst in the tunnel did not occur in the granite body at the maximum burial depth but at the peak section depth,which consistent explained the control role of lithology and geological structure and the Superposition effect of the third phase in-situ stress direction.The results of this paper can be expected to provide reference for similar projects.

关 键 词：北天山 构造演化 地应力 岩爆 

分 类 号：P315.727[天文地球—地震学]