不同岩性分界面位置对隧道初期支护的影响
|
摘要
银(川)西(安)高速铁路贾塬隧道三次长距离穿越不同岩性接触带,严重影响施工进度。本文建立三维数值计算模型,并结合现场监测数据,分析红黏土与砂岩夹泥岩分界面位于隧道不同位置时支护结构的位移及应力变化规律。研究结果表明:随着分界面从隧道顶部下移至隧道底部,拱顶沉降和拱腰水平收敛均逐渐增加,仰拱处初期支护应力逐渐增大;初期支护薄弱点在中上台阶。
The Jiayuan Tunnel of Yinchuan-Xi'an high speed railway passes through long-distance different lithologic contact zones three times,which seriously affects the construction progress. In this paper,a three-dimensional numerical calculation model was established,and the displacement and stress variation laws of the support structure were analyzed when the interface between red clay and sandstone-mudstone is located at different locations of the tunnel.The research results show that as the interface moves down from the top of the tunnel to the bottom of the tunnel,the settlement of the vault and the horizontal convergence of the arch waist increase gradually and the primary support stress at the inverted arch increases gradually.The weak point of primary support is on the upper and middle steps.
The Jiayuan Tunnel of Yinchuan-Xi'an high speed railway passes through long-distance different lithologic contact zones three times,which seriously affects the construction progress. In this paper,a three-dimensional numerical calculation model was established,and the displacement and stress variation laws of the support structure were analyzed when the interface between red clay and sandstone-mudstone is located at different locations of the tunnel.The research results show that as the interface moves down from the top of the tunnel to the bottom of the tunnel,the settlement of the vault and the horizontal convergence of the arch waist increase gradually and the primary support stress at the inverted arch increases gradually.The weak point of primary support is on the upper and middle steps.
引文
[1]刘洋,赵学同,吴顺川.土石交界隧道爆破开挖数值分析[J].北京科技大学学报,2012,34(4):482-488.
[2]徐海廷,王全胜,孙国庆,等.厦门翔安海底隧道土石交界软弱地层全断面注浆试验研究[J].铁道工程学报,2009,26(1):67-71.
[3]黄彬.大断面黄土隧道土石分界段施工技术[J].现代隧道技术,2013,50(1):139-142.
[4]刘永平,姜文涛,宋振军,等.大断面铁路隧道土石分界地段施工技术[C]//中国土木工程学会、中国土木工程学会第十五届年会暨隧道及地下工程分会第十七届年会论文集.成都:中铁西南科学研究院有限公司,2012:345-351.
[5]张自光,仇文革.青岛城市地下空间稳定性三度区域划分研究[J].地下空间与工程学报,2018,14(4):881-892.
[6]尚艳亮,隆卫,刘宝奎,等.上软下硬大跨隧道变形数值分析与规律研究[J].公路,2017,62(9):262-267.
[7]赵宗智,荆敏,王旭.上软下硬地层Ⅴ级围岩超浅埋隧道开挖技术[J].铁道建筑,2017,57(7):81-84.
[8]谢壮,何金峰,石钰锋,等.偏压地形土石交界地层隧道结构内力测试及支护措施研究[J].工程勘察,2013,41(5):23-27.
[9]王志杰,李瑞尧,徐海岩,等.蒙华铁路阳城隧道土石分界处地层大变形机理分析及整治措施[J].铁道建筑,2018,58(8):61-63,83.
[10]喻军,刘松玉,童立元.半硬半软岩隧道塌方的力学特性及处理方法分析[J].工程地质学报,2009,17(2):263-267.
[2]徐海廷,王全胜,孙国庆,等.厦门翔安海底隧道土石交界软弱地层全断面注浆试验研究[J].铁道工程学报,2009,26(1):67-71.
[3]黄彬.大断面黄土隧道土石分界段施工技术[J].现代隧道技术,2013,50(1):139-142.
[4]刘永平,姜文涛,宋振军,等.大断面铁路隧道土石分界地段施工技术[C]//中国土木工程学会、中国土木工程学会第十五届年会暨隧道及地下工程分会第十七届年会论文集.成都:中铁西南科学研究院有限公司,2012:345-351.
[5]张自光,仇文革.青岛城市地下空间稳定性三度区域划分研究[J].地下空间与工程学报,2018,14(4):881-892.
[6]尚艳亮,隆卫,刘宝奎,等.上软下硬大跨隧道变形数值分析与规律研究[J].公路,2017,62(9):262-267.
[7]赵宗智,荆敏,王旭.上软下硬地层Ⅴ级围岩超浅埋隧道开挖技术[J].铁道建筑,2017,57(7):81-84.
[8]谢壮,何金峰,石钰锋,等.偏压地形土石交界地层隧道结构内力测试及支护措施研究[J].工程勘察,2013,41(5):23-27.
[9]王志杰,李瑞尧,徐海岩,等.蒙华铁路阳城隧道土石分界处地层大变形机理分析及整治措施[J].铁道建筑,2018,58(8):61-63,83.
[10]喻军,刘松玉,童立元.半硬半软岩隧道塌方的力学特性及处理方法分析[J].工程地质学报,2009,17(2):263-267.