溶洞位置对隧道围岩稳定性的影响及治理方案研究

发布时间：2018-12-11 12:08

【摘要】：依托霍永高速公路隧道工程实例，借助地质雷达探测和开挖验证的手段研究了溶洞在雷达探测图像上的特征反射。通过对地下工程围岩理论、地下工程围岩稳定性分级方法、岩溶洞穴稳定性评价、地质雷达探测原理、隧道溶洞处置原则等现有资料的研究，并利用数值模拟的方法分析了岩溶洞穴所处位置对隧道围岩稳定性的影响规律。结合现场监控量测手段，研究注浆处理后隧道周边围岩稳定性的改善效果。得到一些直接应用于工程实践或供理论参考的研究成果。主要研究内容如下：（1）地质雷达在探测隧道围岩溶洞时，相应频率的天线和适当的仪器参数设置，在探测隧道周边溶洞时进行合理的测线布置，，岩溶和深沟区域在雷达波形上的呈现特点和反射特征，以及对雷达探测结果的验证。（2）根据岩溶洞穴稳定性评价方法，应用有限元分析手段，模拟溶洞在隧道底板下方，拱顶正上方，隧道右边墙侧方时隧道周边围岩的位移和隧道衬砌的受力情况。并改变溶洞与隧道衬砌的垂直距离，溶洞半径，分析隧道周边围岩位移和衬砌受力变化。依据地下工程围岩散体压力理论和围岩共同作用理论，分析围岩位移变化和衬砌受力变化的原因。（3）依据隧道溶洞处理原则并参照以往工程实例，讨论该工程条件下处理隧道周边溶洞的方案，采用监控量测手段验证溶洞处理后的效果，并分析采用该加固方案对岩溶区域的作用机理。
[Abstract]:Based on the tunnel engineering example of Huo-yong Expressway, the characteristic reflection of karst cave on radar detection image is studied by means of geological radar detection and excavation verification. Based on the study of the existing data such as the theory of underground engineering surrounding rock, the classification method of surrounding rock stability of underground engineering, the evaluation of karst cave stability, the principle of geological radar detection, and the principle of tunnel cavern disposal, etc. The influence of the location of karst cave on the stability of tunnel surrounding rock is analyzed by numerical simulation. Combined with field monitoring and measurement, the improvement effect of surrounding rock stability of tunnel after grouting treatment is studied. Some research results which are directly applied in engineering practice or for theoretical reference are obtained. The main research contents are as follows: (1) the antenna of the corresponding frequency and the appropriate instrument parameters are set when the geological radar detects the surrounding rock caverns of the tunnel, and the reasonable arrangement of the measuring lines is carried out in the detection of the surrounding caverns of the tunnel. The features and reflection characteristics of radar waveforms in karst and deep gully areas, as well as the verification of radar detection results. (2) according to the evaluation method of karst cave stability, the displacement of surrounding rock and the force of tunnel lining are simulated when the karst cave is under the tunnel floor, the arch top is directly above, and the right side of the tunnel wall. The vertical distance between the tunnel and the tunnel lining and the radius of the cavern are changed to analyze the displacement of surrounding rock around the tunnel and the change of the lining force. Based on the theory of pressure of surrounding rock in underground engineering and the theory of joint action of surrounding rock, the reasons for the change of displacement of surrounding rock and the stress change of lining are analyzed. (3) according to the principle of tunnel cavern treatment and referring to the previous engineering examples, the scheme of treating the surrounding karst cave in the tunnel is discussed, and the effect of karst cave treatment is verified by means of monitoring and measurement. The action mechanism of this reinforcement scheme on karst area is analyzed.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.2

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