公路岩溶隧道精细勘察模式及在沾会高速灰岩地区的应用

为了实现对岩溶区公路隧道隐伏岩溶发育情况进行准确的勘察,从而为后期处治设计提供可靠依据,有效减少开挖时产生的突水突泥等事故,通过建立科学的勘察模式,可以有效攻克岩溶发育的隐蔽性、复杂性等难点,达到对隧道岩溶发育进行精细勘察的目的。通过研究调绘、物探、钻探、孔内三维扫描以及水文地质实验相结合的综合勘察模式,并在云南沾会高速德泽隧道的岩溶勘察中进行应用,结果表明:调绘工作先行,可以对工区岩溶发育情况进行宏观判断;隧道贯通物探,可以对具体岩溶发育形态及范围进行圈定,对钻探位置的选择具有指导性左右;钻探工作可以对物探异常进行验证,能准确判断岩溶发育的位置及规模;孔内三维扫描能对岩溶发育形态进行精确直观成像;水文地质实验可以判断场地岩体性质;通过多种手段、层层递进的方式,能有效精确的对隧道岩溶发育情况进行勘察。可见新的隧道岩溶精细勘察模式在实际应用中行之有效,可以在类似工区推广使用。

Fine Survey Method and Application of Highway Karst Tunnel

In order to accurately investigate the development of hidden karst in highway tunnels in Karst areas, provide reliable basis for later treatment design, effectively reduce water inrush and mud inrush accidents during excavation, scientific exploration model can effectively overcome the difficulties of concealment and complexity of karst development, and achieve the purpose of fine investigation of tunnel karst development. This paper studies a comprehensive exploration model combining geological survey, geophysical exploration, drilling, three-dimensional scanning in boreholes and hydrogeological experiments, and has been successfully applied in the karst exploration of Deze Tunnel of Zhanhui High-speed in Yunnan Province. The results show that the geological survey work was in the first place, and the karst development in the work area can be judged macroscopically; the tunnel through geophysical exploration can be used to determine the specific karst development form and the karst development. Scope delineation can guide the selection of drilling location; drilling work can verify geophysical anomalies and accurately judge the location and scale of karst development; three-dimensional scanning in boreholes can accurately visualize the karst development form; hydrogeological experiments can judge the nature of site rock mass; through various means and progressive ways, it can effectively and accurately determine the karst development. The development of karst in tunnels is investigated. It can be seen that the new tunnel karst fine survey model is effective in practical application and has good application value in similar work areas.