公路隧道最优开挖方法探讨分析

发布时间：2018-06-07 09:23

本文选题：隧道 + V_级围岩　；参考：《公路》2017年05期

【摘要】：结合隧道洞口过渡段不合理的开挖方式极易导致洞口段塌方的现状,以承赤高速公路第十九标段锥子山1号隧道右线工程为依托,通过FLAC~(3D)数值模拟的方法对V_2级围岩浅埋隧道采用单侧壁导洞法、预留核心土法、双侧壁导洞法、台阶法等4种开挖方法进行研究,通过对比分析隧道围岩位移与应力、衬砌结构位移与应力、塑性区体积,得出以下结论:单侧壁导洞法开挖会造成偏压,所得偏压量可为以后类似地质条件隧道开挖提供参考;开挖方法是否适合工程条件与其应力释放率大小及释放集中程度有直接关系,初步推断应力释放率有与围岩位移成正比、与围岩应力成反比的关系;双侧壁导洞法应力释放缓和,围岩、衬砌、锚杆位移与应力控制均是4种方法中最优的,塑性区发展控制也较为理想,认定为V_2级围岩浅埋隧道开挖最合理方法。
[Abstract]:Combined with the unreasonable excavation mode of the transition section of the tunnel opening, it is easy to cause the collapse of the tunnel entrance section, and based on the right line project of Gangzishan No.1 Tunnel in the 19th section of Chengchi Expressway, In this paper, four excavation methods such as single side tunnel method, reserved core soil method, double side wall guide method, step method and so on, are used to study the displacement and stress of the surrounding rock of the tunnel by using the numerical simulation method of FLACX / 3D, and by comparing and analyzing the displacement and stress of the surrounding rock of the tunnel, and by comparing and analyzing the displacement and stress of the surrounding rock of the tunnel. The displacement and stress of the lining structure and the volume of the plastic zone are obtained. The following conclusions are drawn: the single side tunnel excavation method will cause the bias voltage, which can be used as a reference for the tunnel excavation in similar geological conditions in the future; Whether the excavation method is suitable for engineering conditions is directly related to the magnitude of stress release rate and the degree of release concentration. It is preliminarily inferred that the stress release rate is proportional to the displacement of surrounding rock and inversely proportional to the stress of surrounding rock. The stress release relaxation, surrounding rock, lining, bolt displacement and stress control are all the best in the method of double side wall guide tunnel, and the plastic zone development control is also ideal, which is considered as the most reasonable method for excavation of shallow buried tunnel in class V2 surrounding rock.
【作者单位】：河北工业大学土木与交通学院;中国建筑第六工程局有限公司;
【基金】：河北省交通运输厅2013年度科研项目,项目编号201302025
【分类号】：U455.4

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