大断面黄土隧道围岩纵向位移及预留沉降量研究  

STUDY ON THE LONGITUDINAL DISPLACEMENT AND RESERVED SETTLEMENT OF SURROUNDING ROCK IN LARGE-SECTION LOESS TUNNEL

作　　者：李春清 梁庆国[3] 吴旭阳 李双营 杨文晗 

机构地区：[1]青海民族大学建筑工程学院,青海西宁810007 [2]甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070 [3]兰州交通大学土木工程学院,甘肃兰州730070 [4]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000 [5]重庆文理学院建筑工程学院,重庆402160

出　　处：《南阳理工学院学报》2017年第6期90-94,共5页Journal of Nanyang Institute of Technology

基　　金：国家自然科学基金(41562013);国家自然科学基金(41262010)

摘　　要：以采用三台阶七步法施工的宝兰客运专线黄土隧道为背景,通过现场监测结果和理论计算结果具体分析,研究了大断面黄土隧道围岩纵向位移及预留沉降量。监测数据表明:隧道围岩压力分布对称而不均匀,拱顶最小,拱腰最大;隧道围岩纵向位移中拱顶沉降位移远远大于水平收敛位移。理论研究结果表明:黄土垂直节理发育和塑性区存在对隧道围岩纵向位移有一定影响;对比分析了学者们在纵向位移方面已取得的研究结果;得出了大断面黄土隧道围岩纵向位移的变化曲线(Loess曲线);推出了黄土隧道围岩的预留沉降量计算公式。研究结果对今后大断面黄土隧道的设计与施工具有一定的参考价值。Taking the loess tunnel constructed by three-bench and sevvn-step method method ofback, through analyzing results of field test and theoretical calculation,Study on the longitiidinal displacemenof surrounding rock in large-section loess tunnel. The result of monitoring data shows that surrounding rock pressure distrilDution of tun-nel is symmetrical and uneven,arch. the la rge s t, haunch. the minimal. Arch crown displacement is far greater than the horizontal con-vergence displacement. The result of the theoretical research shows that The vertical joints growth of loess and plhave great infliaence on the longitiadinal displacement of surrounding rock,Analyzing research results of the scholars in the longitiadinaldisplaccment,obtained the changing curve of the longitudinal displaccment of surrounding rock in large section loess tunnel （ Loess curve ）,introduced the calculation formula of reserved settlement in loess tunnel. The research results can provide referencc for the de-sign and construction of similar projects in the future.

关 键 词：大断面黄土隧道 围岩压力 纵向位移 垂直节理 塑性区 预留沉降量 

分 类 号：U25[交通运输工程—道路与铁道工程]