秦岭地应力特征及对隧道选址的影响研究
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摘要
秦岭地区岩性、构造复杂,隧道选址和建设困难,其中以高地应力产生的岩爆病害最为严重。为减缓岩爆对秦岭地区隧道工程的影响,需掌握本区内应力场的分布规律。对秦岭地区越岭隧道(洞)等项目中具有代表性的110组地应力数据进行统计,并对地应力参数进行数学回归分析,得出秦岭地区最大水平主应力、最小水平主应力以及侧压系数随埋深分布的特征,并验证了构造应力方向以NW为主。以西渝高铁太兴山秦岭隧道为例,给出高应力环境下隧道选址建议。
In Qinling Mountain area with complex lithology and structure,the tunnel site selection and construction are difficult,and the rock burst disease caused by its high ground stress is especially serious. In order to mitigate the impact of rock burst on the tunnel project in Qinling area,it is necessary to master the distribution law of stress field in this area. By statistical analysis on 110 sets of representative geostress data of projects in Qinling area including the tunnel( hole) through mountain,and by mathematical regression analysis of the geostress parameters,the distribution features of maximum horizontal principal stress,minimum horizontal principal stress and lateral pressure coefficient varying with the buried depth in the Qinling area are obtained. Also it is verified that the tectonic stress direction is dominated by NW. Taking the Qinling Tunnel in Taixing mountains of Xi-Yu high-speed railway as an example,the suggestions for tunnel site selection under high stress environment are given.
In Qinling Mountain area with complex lithology and structure,the tunnel site selection and construction are difficult,and the rock burst disease caused by its high ground stress is especially serious. In order to mitigate the impact of rock burst on the tunnel project in Qinling area,it is necessary to master the distribution law of stress field in this area. By statistical analysis on 110 sets of representative geostress data of projects in Qinling area including the tunnel( hole) through mountain,and by mathematical regression analysis of the geostress parameters,the distribution features of maximum horizontal principal stress,minimum horizontal principal stress and lateral pressure coefficient varying with the buried depth in the Qinling area are obtained. Also it is verified that the tectonic stress direction is dominated by NW. Taking the Qinling Tunnel in Taixing mountains of Xi-Yu high-speed railway as an example,the suggestions for tunnel site selection under high stress environment are given.
引文
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[4]张波.秦岭造山带实测浅层地应力特征研究[J].地下空间与工程学报,2016,12(2):392-396
[5]中铁第一勘察设计院集团有限公司.超长深埋隧洞深层高地应力岩爆预测与防治技术研究报告[Z].西安:中铁第一勘察设计院集团有限公司,2018
[6]单茂青,王玉忠,胡永雄,等.一种多功能局部反循环筒[J].油气井测试,2017(2):47-49
[7]张新辉,焦萱,王瑞芳,等.秦岭北缘某深埋引水隧洞应力场特征研究[J].地下空间与工程学报,2017(2):410-415
[8]景锋,盛,谦,张勇慧,等.中国大陆浅层地壳实测地应力分布规律研究[J].岩石力学与工程学报,2007(10):2056-2062
[9]陈秀义.高地应力状态下硬质碎裂岩隧道变形机理研究[J].铁道标准设计,2017(11):56-60
[10]王江.秦岭特长隧洞超埋深强构造应力大变形处理技术研究[J].水利水电技术,2017,48(7):64-67
[11]中铁第一勘察设计院集团.西康线钻孔(S2Z-1)地应力测试报告[Z].西安:中铁第一勘察设计院集团有限公司,2007
[12]赵前进.玉磨铁路隧道工程地质特征及地质风险分析[J].铁道勘察,2017(4):42-45
[13]田鹏.高地应力软岩隧道围岩压力及二衬受力特征研究[J].铁道标准设计,2016(8):108-112
[14]沙鹏,伍法权,李响,等.高地应力条件下层状地层隧道围岩挤压变形与支护受力特征[J].岩土力学,2015(5):1408-1413
[15]苗高建.某铁路穿越断裂带的综合地质勘察[J].铁道勘察,2017(4):46-49