新大成隧道基底脱空病害区动力特性分析及注浆加固研究
发布时间：2019-03-25 19:15
【摘要】：近年来,我国铁路发展日新月异,铁路隧道随之增多,现有铁路隧道病害也日益凸显,其中隧道基底病害是隧道病害中较为常见病害之一。隧道基底病害严重时将对行车安全造成严重影响。目前针对隧道基底病害现象开展系统分析的文献尚少,本文以新大成铁路隧道为依托,对该隧道基底存在的病害问题进行了深入调查与分析,主要内容如下:(1)以地质雷达和钻探为手段对新大成隧道基底病害进行了调查,探究了病害形式、分布段落以及病害成因。其中基底脱空病害相对严重,且多分布于Ⅲ级围岩段。(2)用精密水准仪对道心处路基表面和内轨顶面进行了沉降变形观测,进一步确定了病害分布区域及基底沉降程度。(3)在新大成隧道内分隔标为分+1350、分+1965、分+1970、分+2000、分+2530的这五个特征断面处钻孔埋设压力盒和应变片,进行了现场测试,分析了动应力及动应变在隧道基底不同位置处的分布规律。(4)借助MATLAB软件进行编程,对现场动力测试采集的应力、应变数据进行频谱分析,获得了频域分布规律,信号组成,得出了隧道基底敏感频率。(5)利用新大成隧道基底钻孔取芯材料进行了室内试验,获得相关参数,为数值模拟奠定了基础。根据之前调查得到的隧道基底脱空病害分布规律,通过Midas/GTS有限元软件分别模拟了正常状态和单侧、双侧、中间脱空等不同工况条件下新大成隧道,然后对不同工况下隧道基底应力分布规律作出分析。(6)针对新大成隧道基底存在的不同脱空情况,结合常用注浆方案,对隧道基底脱空病害区进行了注浆加固模拟,对注浆参数进行了优选,对注浆工艺提出了合理建议。
[Abstract]:In recent years, with the rapid development of railway in China, the number of railway tunnels has increased, and the existing railway tunnel diseases have become increasingly prominent. Among them, tunnel base disease is one of the more common diseases in tunnel diseases. When the tunnel base disease is serious, the traffic safety will be seriously affected. At present, there are few literatures on the systematic analysis of tunnel basement diseases. Based on the Xindacheng railway tunnel, this paper makes an in-depth investigation and analysis on the defects existing in the tunnel basement. The main contents are as follows: (1) the basement disease of Xindacheng tunnel is investigated by means of ground penetrating radar and drilling, and the form, distribution and cause of the disease are discussed. The basement emptying disease is relatively serious, and most of them are distributed in grade 鈪，
本文编号：2447240
[Abstract]:In recent years, with the rapid development of railway in China, the number of railway tunnels has increased, and the existing railway tunnel diseases have become increasingly prominent. Among them, tunnel base disease is one of the more common diseases in tunnel diseases. When the tunnel base disease is serious, the traffic safety will be seriously affected. At present, there are few literatures on the systematic analysis of tunnel basement diseases. Based on the Xindacheng railway tunnel, this paper makes an in-depth investigation and analysis on the defects existing in the tunnel basement. The main contents are as follows: (1) the basement disease of Xindacheng tunnel is investigated by means of ground penetrating radar and drilling, and the form, distribution and cause of the disease are discussed. The basement emptying disease is relatively serious, and most of them are distributed in grade 鈪，
本文编号：2447240
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