隧道软岩特性分析及施工控制措施研究
发布时间：2018-08-18 17:30
【摘要】：关垭子隧道围岩岩性较差,风化及岩石破碎程度随里程变化无明显规律,围岩层间夹杂大量弱胶结矿物,节理发育,开挖后基本无自稳能力,且围岩暴露后强度衰减较快,遇空气具有膨胀、疏松的特点,遇水软化,具有明显的软岩持续变形特征。因此,为保证隧道施工的安全进行,针对前述问题展开研究,相关研究成果可为该隧道施工提供指导,也可为类似隧道设计和施工提供参考。主要的研究工作和成果如下:(1)通过对围岩岩样微观结构的观察,对岩样进行了岩相鉴定,确定为绢云母千枚岩。岩石力学特性试验测试了岩石的物理、水理性质及岩石的强度指标。(2)根据现场取样所获得岩石力学特性测试试验数据,结合现场实际对关垭子隧道大变形机理进行分析发现,隧道开挖后短期内变形主要由围岩塑性流动造成,而过一段时间后膨胀变形则开始产生作用。隧道围岩压力同时包括围岩塑性流动和膨胀作用围岩压力。(3)在试验结果的基础上利用岩土工程软件FLAC3D对隧道施工进行数值模拟,计算内容包括实际施工中采用的三台阶法、CRD法、提高支护参数的CRD法和双侧壁导坑法。依据计算结果和实际监控量测数据,建议合理的支护参数和施工方法。
[Abstract]:The surrounding rock lithology of Guanyazi tunnel is poor, the weathering and rock fragmentation degree have no obvious regularity with mileage, a large number of weakly cemented minerals are mixed between the surrounding rock layers, the joints are developed, after excavation, there is basically no self-stability ability, and the strength of the surrounding rock decreases rapidly after exposure. The air has the characteristics of expansion and looseness, and the softening of water has obvious characteristics of continuous deformation of soft rock. Therefore, in order to ensure the safety of tunnel construction, the above problems are studied. The related research results can provide guidance for the tunnel construction, but also provide reference for similar tunnel design and construction. The main research work and results are as follows: (1) by observing the microstructure of the surrounding rock samples, the lithofacies of the rock samples is identified as sericite phyllite. The physical and hydrological properties of rock and the strength index of rock are tested by rock mechanical properties test. (2) according to the test data of rock mechanical properties obtained from field sampling, the large deformation mechanism of Guanyazi Tunnel is analyzed and found according to the field practice. The deformation in the short term after tunnel excavation is mainly caused by the plastic flow of surrounding rock, but after a period of time, the expansion deformation begins to play an important role. The surrounding rock pressure of tunnel includes plastic flow of surrounding rock and expansion of surrounding rock. (3) based on the test results, the numerical simulation of tunnel construction is carried out by using geotechnical engineering software FLAC3D. The CRD method and the double side wall guide pit method are used to improve the supporting parameters. Based on the calculated results and the actual monitoring data, reasonable support parameters and construction methods are suggested.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4
本文编号：2190176
[Abstract]:The surrounding rock lithology of Guanyazi tunnel is poor, the weathering and rock fragmentation degree have no obvious regularity with mileage, a large number of weakly cemented minerals are mixed between the surrounding rock layers, the joints are developed, after excavation, there is basically no self-stability ability, and the strength of the surrounding rock decreases rapidly after exposure. The air has the characteristics of expansion and looseness, and the softening of water has obvious characteristics of continuous deformation of soft rock. Therefore, in order to ensure the safety of tunnel construction, the above problems are studied. The related research results can provide guidance for the tunnel construction, but also provide reference for similar tunnel design and construction. The main research work and results are as follows: (1) by observing the microstructure of the surrounding rock samples, the lithofacies of the rock samples is identified as sericite phyllite. The physical and hydrological properties of rock and the strength index of rock are tested by rock mechanical properties test. (2) according to the test data of rock mechanical properties obtained from field sampling, the large deformation mechanism of Guanyazi Tunnel is analyzed and found according to the field practice. The deformation in the short term after tunnel excavation is mainly caused by the plastic flow of surrounding rock, but after a period of time, the expansion deformation begins to play an important role. The surrounding rock pressure of tunnel includes plastic flow of surrounding rock and expansion of surrounding rock. (3) based on the test results, the numerical simulation of tunnel construction is carried out by using geotechnical engineering software FLAC3D. The CRD method and the double side wall guide pit method are used to improve the supporting parameters. Based on the calculated results and the actual monitoring data, reasonable support parameters and construction methods are suggested.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4
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