偏压小净距隧道施工及其稳定性研究
发布时间：2018-11-27 20:41
【摘要】：小净距隧道是介于连拱隧道和分离隧道的一种隧道结构形式,这种隧道形式能够充分发挥围岩的力学性能,降低造价,简化工序,增加隧道整体稳定性。然而由于地形、地质和线形等条件的限制,桥、隧直接相连的情况会经常遇到,同时会伴随着隧道与边坡斜交的偏压问题。因此,对于小净距偏压隧道的设计与施工研究逐渐成为工程界关注的难点和热点问题。本文首先分析了偏压小净距隧道的研究现状,然后根据现有的研究成果,以麻竹高速公路香山隧道工程为依托,针对浅埋偏压小净距隧道设计与施工中的关键问题,采用理论分析、现场监测与有限元数值模拟分析相结合的方法,进行了研究和探讨,得到的主要研究成果为:1.对浅埋偏压条件下的小净距隧道围岩压力进行分析,获得了偏压小净距隧道的受力特征以及隧道的破坏形式。2.针对香山隧道开挖过程及爆破过程的实际工况进行了数值模拟,获得了左右洞开挖顺序以及爆破振动对围岩应力及位移的影响,尤其是对中隔墙稳定性的影响,然后根据模拟结果,对中隔墙等危险薄弱部位采取了适当的加固措施。3.通过对香山隧道施工现场进行监控量测,得到了香山隧道拱顶沉降、水平收敛以及围岩压力的变化规律。同时将施工现场监测结果和数值模拟结果进行了对比分析。4.基于现场监控量测数据,建立灰色神经网络组合预测模型,对隧道位移进行预测,将预测结果同现场监测结果进行对比分析,分析表明灰色神经组合预测模型具有较高的预测精度,适用性较强。
[Abstract]:The small clear distance tunnel is a kind of tunnel structure between multi-arch tunnel and separated tunnel. This kind of tunnel form can give full play to the mechanical properties of surrounding rock reduce the cost simplify the working procedure and increase the overall stability of the tunnel. However, due to the constraints of topography, geology and alignment, the direct connection of bridges and tunnels is often encountered, which is accompanied by the skew pressure between the tunnel and the slope. Therefore, the research on the design and construction of small offset bias tunnel has gradually become a difficult and hot issue in the engineering field. In this paper, the current situation of the research on the small offset tunnel is first analyzed, and then, based on the existing research results, the key problems in the design and construction of the shallow bias voltage small clear distance tunnel based on the Xiangshan Tunnel of the Maazhu Expressway are discussed. The theoretical analysis, field monitoring and finite element numerical simulation are used to study and discuss. The main results are as follows: 1. In this paper, the surrounding rock pressure of the tunnel with small net distance under the condition of shallow buried bias is analyzed, and the stress characteristics of the tunnel and the failure mode of the tunnel are obtained. 2. Based on the numerical simulation of the excavation process and blasting process of Xiangshan tunnel, the effects of excavation sequence and blasting vibration on the stress and displacement of surrounding rock, especially on the stability of the middle partition wall, are obtained. Then, according to the simulation results, appropriate reinforcement measures are taken for the dangerous weak parts such as the middle partition wall. By monitoring and measuring the construction site of Xiangshan Tunnel, the rules of settlement, horizontal convergence and pressure of surrounding rock of Xiangshan Tunnel are obtained. At the same time, the construction site monitoring results and numerical simulation results are compared and analyzed. 4. Based on the field monitoring data, a grey neural network combined forecasting model is established to predict the tunnel displacement. The prediction results are compared with the field monitoring results. The analysis shows that the grey neural combination prediction model has higher prediction accuracy and better applicability.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455
本文编号：2361979
[Abstract]:The small clear distance tunnel is a kind of tunnel structure between multi-arch tunnel and separated tunnel. This kind of tunnel form can give full play to the mechanical properties of surrounding rock reduce the cost simplify the working procedure and increase the overall stability of the tunnel. However, due to the constraints of topography, geology and alignment, the direct connection of bridges and tunnels is often encountered, which is accompanied by the skew pressure between the tunnel and the slope. Therefore, the research on the design and construction of small offset bias tunnel has gradually become a difficult and hot issue in the engineering field. In this paper, the current situation of the research on the small offset tunnel is first analyzed, and then, based on the existing research results, the key problems in the design and construction of the shallow bias voltage small clear distance tunnel based on the Xiangshan Tunnel of the Maazhu Expressway are discussed. The theoretical analysis, field monitoring and finite element numerical simulation are used to study and discuss. The main results are as follows: 1. In this paper, the surrounding rock pressure of the tunnel with small net distance under the condition of shallow buried bias is analyzed, and the stress characteristics of the tunnel and the failure mode of the tunnel are obtained. 2. Based on the numerical simulation of the excavation process and blasting process of Xiangshan tunnel, the effects of excavation sequence and blasting vibration on the stress and displacement of surrounding rock, especially on the stability of the middle partition wall, are obtained. Then, according to the simulation results, appropriate reinforcement measures are taken for the dangerous weak parts such as the middle partition wall. By monitoring and measuring the construction site of Xiangshan Tunnel, the rules of settlement, horizontal convergence and pressure of surrounding rock of Xiangshan Tunnel are obtained. At the same time, the construction site monitoring results and numerical simulation results are compared and analyzed. 4. Based on the field monitoring data, a grey neural network combined forecasting model is established to predict the tunnel displacement. The prediction results are compared with the field monitoring results. The analysis shows that the grey neural combination prediction model has higher prediction accuracy and better applicability.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455
【参考文献】
相关期刊论文 前1条
1 王兵,谢锦昌;偏压隧道模型试验及可靠度分析[J];工程力学;1998年01期
相关硕士学位论文 前3条
1 王勤;高校学生个人信用评价方法及应用研究[D];重庆大学;2006年
2 刘彦波;岩溶富水地层隧道施工处治技术研究[D];重庆交通大学;2008年
3 国威;基于神经网络理论的公路隧道围岩变形预测与稳定性分析[D];重庆大学;2009年
，本文编号：2361979
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2361979.html
