用TSP预报数据划分铁路隧道围岩级别

发布时间：2018-12-06 21:54

【摘要】：研究目的:在铁路隧道施工过程中,当隧道围岩地质情况与设计不符时,经常会对隧道围岩分级进行变更。实践中,应用地震纵波速度对隧道围岩进行分级存在许多问题。目前隧道围岩分级仍然以定性为主。由于隧道围岩分级涉及隧道施工参建各方的切身经济利益,以及隧道施工进度和安全,因此参建各方都高度关注隧道围岩分级变更。当前,使用地震波反射法进行隧道超前地质预报(TSP)已是标配方法,TSP预报数据包含隧道围岩的各项物理力学参数及其空间变化。通过分析总结,本文据此对隧道围岩进行定量分级,可以解决由定性围岩分级造成的矛盾。研究结论:(1)使用TSP预报数据,以岩性、动态杨氏模量为隧道围岩基本分级指标,以泊松比及其变化为隧道围岩分级修正指标,结合反射界面密集程度,通过本文的表1及其使用说明,可以定量划分铁路隧道围岩分级;(2)理论上,这一分级与铁路隧道围岩分级体系是一致的;(3)本文提出的铁路隧道围岩分级定量指标还需在实践中不断统计修正。
[Abstract]:Research purpose: in the process of railway tunnel construction, when the geological condition of surrounding rock of tunnel does not accord with the design, the classification of surrounding rock of tunnel is often changed. In practice, there are many problems in classifying tunnel surrounding rock by using seismic longitudinal wave velocity. At present, the classification of tunnel surrounding rock is still qualitative. As the surrounding rock classification involves the economic interests of the parties involved in the construction of the tunnel, as well as the progress and safety of the tunnel construction, all the involved parties pay great attention to the change of the surrounding rock classification of the tunnel. At present, the seismic wave reflection method is used to predict tunnel geological advance (TSP) is the standard method. The TSP prediction data include the various physical and mechanical parameters of tunnel surrounding rock and their spatial changes. According to the analysis and summary, this paper can solve the contradiction caused by the qualitative surrounding rock classification by quantitatively classifying the surrounding rock of the tunnel. The conclusions are as follows: (1) using the TSP prediction data, taking lithology and dynamic Young's modulus as the basic classification index of tunnel surrounding rock, taking Poisson's ratio and its variation as the classification index of tunnel surrounding rock, combined with the dense degree of reflection interface, The surrounding rock classification of railway tunnel can be quantitatively divided by table 1 and its usage explanation in this paper. (2) in theory, this classification is consistent with the classification system of railway tunnel surrounding rock, (3) the quantitative index of railway tunnel surrounding rock classification proposed in this paper needs to be continuously revised in practice.
【作者单位】：中铁第一勘察设计院集团有限公司甘肃勘察院;
【分类号】：U452.12

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