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随着以千枚岩为主的软岩隧道的大量兴建,建立针对性的位移安全控制基准已成为工程界亟待解决的难题之一。以横跨5.12震区的广(元)甘(肃)高速公路杜家山隧道为工程背景,采用室内模型试验及现场试验相结合的研究手段,通过对以V级围岩为主的破碎千枚岩隧道在不同埋深、施工工法及支护参数等条件下位移变形规律的研究,揭示埋深、施工工法、支护与隧道位移间的关联性,结果表明较之工法、支护参数而言,埋深对隧道变形的影响更为显著。并以拱顶沉降作为主要控制指标,以衬砌裂损的出现作为隧道稳定性的判别标志,结合依托工程现场统计数据的系统分析,建立破碎千枚岩隧道中埋深在300 m以内、三台阶法(核心土)以及F3~F5支护方式下的施工期位移安全控制基准。
With the massive construction of soft rock tunnels dominated by phyllites, establishing targeted control benchmarks for displacement safety has become one of the most urgent problems in engineering. Based on the engineering background of Dujiashan tunnel of Guangyuan (Gansu) Gan (Su) Expressway across the 5.12 Earthquake Zone, this study adopted a combination of indoor model test and field test, The research on the displacement and deformation of rock tunnel under different depths, construction methods and support parameters reveals the correlation between the depth of burial ground, construction method and support and tunnel displacement. The results show that in terms of working method and supporting parameters , Depth of the tunnel deformation is more significant impact. The vault settlement is taken as the main control index and the occurrence of lining crack is taken as the distinguishing mark of the tunnel stability. Combined with the systematic analysis of the on-site statistical data, the crushed phyllite tunnel is established within 300 m and the three steps Law (core soil) and F3 ~ F5 support under the construction of displacement safety control benchmarks.