深埋软岩隧道开挖及支护变形特征研究

发布时间：2018-02-20 22:07

本文关键词： 深埋软岩隧道变形 FLACD 滇中引水工程　出处：《水电能源科学》2017年01期 　论文类型：期刊论文

【摘要】：针对滇中引水工程中磨盘山隧道的深埋软岩段,利用ANSYS建立三维数值模型,通过FLAC~(3D)进行计算,研究了深埋软岩隧道开挖及支护后围岩的变形和破坏特征。结果表明,围岩强度和隧道埋深是影响隧道变形破坏的重要因素。隧道开挖后,应力重分布,隧道前段围岩强度较小,变形总位移、塑性区范围大于后段,在拱腰两侧对称形成两个应力集中区。隧道支护后,有效限制了隧道变形的继续发展,各部位总位移值减小,塑性区范围也得到抑制,拱腰两侧应力集中区向洞壁靠拢,应力分布也变得均匀。
[Abstract]:In view of the deep buried soft rock section of Mopanshan tunnel in the central Yunnan water diversion project, a three-dimensional numerical model was established by using ANSYS, and the deformation and failure characteristics of the surrounding rock after excavation and support of the deep buried soft rock tunnel were studied by using the calculation method of FLACU (3D). The results show that the deformation and failure characteristics of the deep buried soft rock tunnel after excavation and support are analyzed. The strength of surrounding rock and the buried depth of tunnel are the important factors affecting the deformation and failure of tunnel. After excavation, the stress redistribution, the strength of surrounding rock in the front section of the tunnel is small, the total deformation displacement, the range of plastic zone is larger than that of the back section. Two stress concentration zones are formed symmetrically on both sides of the arch waist. After the tunnel support, the continuous development of tunnel deformation is effectively restricted, the total displacement value of each part is reduced, the plastic zone range is also restrained, and the stress concentration zone on both sides of the arch waist is close to the wall of the tunnel. The stress distribution also becomes uniform.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家自然科学基金项目(41272332)
【分类号】：TV554

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