渤海海峡跨海通道工程南段地应力特征与工程稳定性分析  

Characteristics of in-situ stresses and engineering stability analysis on the south section of the Bohai Strait Cross-Sea Corridor project

作　　者：乔二伟[1,2,3,4] 马秀敏 郭华林[1,6] 孙尧 姜景捷 QIAO Erwei;MA Xiumin;GUO Hualin;Sun Yao;JIANG Jingjie(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Observation and Research Station of Crustal Stress and Strain in Beijing,Ministry of Natural Resources,Beijing 100081,China;Technology Innovation Center for In-situ Stress,Ministry of Natural Resources,Beijing 100081,China;Key Laboratory of Active Tectonics and Geological Safety,Ministry of Natural Resources,Beijing 100081,China;University of Science and Technology Beijing,Beijing 100083,China;Engineering Faculty,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]自然资源部北京地壳应力应变野外科学观测研究站,北京100081 [3]自然资源部地应力工程技术创新中心,北京100081 [4]自然资源部活动构造与地质安全重点实验室,北京100081 [5]北京科技大学,北京100083 [6]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《地质力学学报》2025年第2期197-210,共14页Journal of Geomechanics

基　　金：中国地质调查局地质调查项目(DD20230249,DD20230014,DD20160149);国家自然基金基金项目(42272222);中国地质科学院地质力学研究所基本科研业务费项目(DZLXJK202106,DZLXS202211)。

摘　　要：渤海海峡跨海通道工程是连接山东半岛与辽东半岛重要的海上交通主线工程,沿线地应力状态是工程设计和施工决策的重要参考依据。为了准确获得工程南段地区现今地应力特征及构造应力场分布特征,在烟台市蓬莱区西南北沟镇实施了300m以浅的水压致裂法地应力测量。结果表明:测区主导应力为水平构造应力,与东北—华北应力区其他地区相比,应力值处于中等;随测量深度增加,最大水平主应力(S_(H))、最小水平主应力(S_(h))和垂向主应力(S_(v))均呈线性增大趋势;在测量深度范围内地壳浅表层应力结构以逆断型为主,即S_(H)>S_(h)>S_(v);实测S_(H)平均方位角为N75.3°E,与华北应力区的应力场方向一致,也与其震源机制解和GPS测量揭示的区域构造应力场方向基本一致。应用库仑摩擦滑动准则和此次测量数据,初步评估了渤海海峡跨海通道工程南段地区现今地应力积累水平及其对工程稳定性的影响,认为σ_(θ_(max))区域内应力积累总体水平相对较低,工程区域地壳相对稳定。依据岩爆危险程度综合判别准则/R_(c)讨论了通道区域地下隧道工程围岩岩爆的可能性,认为该工程地下隧道发生岩爆可能性很低,隧道围岩总体稳定。研究结果为渤海海峡跨海通道工程的设计、施工等方案的优选提供了科学依据,同时也可为区域活动断裂、地震地质、区域动力学等研究提供基础数据。[Objective]The Bohai Strait Cross-Sea Corridor is an important maritime traffic project which joins the Liaodong and the S_(h)andong peninsulas.The state of geostress is an important reference for engineering design and construction decision-making.[Method]In order to better understand the present characteristics of the geostress and the distribution of the tectonic stress field in the southern section of the project,hydraulic fracturing tests were conducted for stress measurements at 0~300 m depth at Beigou Town,southwest Penglai District,Yantai City.[Results]The analysis of the measured data indicates that the in-situ stress field is controlled by horizontal tectonic stress in the study area,and the horizontal stress values are at an intermediate level compared with those obtained elsewhere in the Northeast-North China Stress Zone;S_(H)(the maximum horizontal principal stress),S_(h)(the minimum horizontal principal stress),and S_(v)(the vertical principal stress)change linearly with the depth of the BGZ borehole;in the depth range of the measurements,the shallow surface stress of the crust is mainly reverse fault type,that is,the relationship of the three principal stresses is S_(H)>S_(h)>S_(v).The measured S_(H) average azimuth angle in the borehole,N75.3°E,is in good agreement with the direction of the tectonic stress field of the North China Stress Zone to which the study area belongs;and,it is basically consistent with the direction of the regional tectonic stress field revealed by the focal source mechanism solution and GPS measurement.The Coulomb friction sliding criterion and the measured data are used to preliminarily evaluate the current level of geostress accumulation in the study area and its impact on the engineering stability.It is believed that the overall level of stress accumulation in the region is relatively low,and the crust in the engineering area is currently relatively stable.In addition,based on the comprehensive discrimination criterion of rock burst danger,σ_(θ_(max))/R_(c),the possi

关 键 词：渤海海峡 跨海通道工程 水压致裂法 地应力 围岩稳定性 构造应力场 

分 类 号：P315.727[天文地球—地震学] TV554[天文地球—固体地球物理学]