杉阳隧道破碎泥页岩段高压囊状水腔处理措施

Treatment Measures for High-Pressure Cystic Water Cavity in Shattered Shale Section of Shanyang Tunnel

随着公路、铁路隧道建设向长、大、深方向发展,隧道施工中遇到的水害工况更加复杂难测,国内外学者在富水溶洞、大型溶腔的超前预报和处治技术方面已取得很多施工经验和研究成果,但针对小型的高压囊状水腔,目前仍存在因超前地质预报不够精准、防突层预留厚度不足而引发的失稳破坏等问题。针对上述问题,以大瑞铁路杉阳隧道为例,开展囊状水腔防突层计算和处理措施研究,通过地质雷达法、瞬变电磁法结合超前探孔,综合对照获知隧道线路上的囊状水腔大小和分布,进行防突层安全厚度计算,并采用钻孔泄水、注浆填充、边泄边注等处理措施,有效防止了突水、溜塌等地质灾害发生,保证了隧道施工安全可控。

With the development of highway and railway tunnel construction in the direction of long,large and deep,the water disaster conditions encountered in tunnel construction are more complex and difficult to measure.Domestic and foreign scholars have made a lot of construction experience and research results in the advance prediction and treatment technology of water-rich karst caves and large karst caves.However,for small high-pressure cystic water cavities,there are still some problems such as instability and damage caused by inaccurate advance geological prediction and insufficient reserved thickness of outburst prevention layer.In view of the above problems,the Shanyang Tunnel of the Dali-Ruili Railway is taken as an example to carry out the research on the calculation and treatment measures of the burst-proof layer of the cystic water cavity.Through the combination of the geological radar method,the transient electromagnetic method and the advance hole exploration,the size and distribution of the cystic water cavity on the tunnel line are obtained by comprehensive comparison,and the safety thickness of the burst-proof layer is calculated.Additionally,the geological disasters such as water inrush and collapse are effectively prevented by the treatment measures such as boring for water discharge,grouting filling,and pouring while discharging,and the tunnel construction is safe and controllable.