钟公穿煤隧道围岩稳定性分析与施工

Stability Analysis and Construction Measures of Zhonggong Tunnel Through Coal Seam

瑞金至赣州高速公路52%路段经过不良地质地区,施工难度大。钟公隧道左线全长4 180m,右线全长4 185m,穿越一段煤系地层。施工过程中出现了围岩变形,拱顶沉降严重现象。分析了引起穿越煤系地层隧道围岩变形的主要原因有地形地貌、地质构造、地层岩性、水的作用和初期支护强度不够等。针对煤系地层隧道围岩变形,指出了尽快封闭工作面、加强临时支护的刚度、对开挖段进行预先加固、及时强行支护、搞好排水措施等应对方法。左洞施工经验证明所述措施有效控制了围岩变形,保证了施工顺利进行。

：The 52 percent of the highway from Ruijin to Ganzhou crosses poor geological zones, so it is difficult to construct. The length of left line of Zhonggong Tunnel is 4 180m, and the right line is 4 185m. Because the tunnel crosses through a section of coal seam, the surrounding rock deformation and vault settlement are serious during construction. The authors analyze causes for the deformation of surrounding rock such as the topography and geomorphology, geological structure, lithology, action of water and lack of primary support. Then, they propose corresponding measures to control the deformation of surrounding rock, including closing the face as soon as possible, improving the stiffness of temporary support, reinforcing primary support beforehand in excavated section, compulsory supporting timely, and improving the drainage measures. By adopting mentioned measures in left line of Zhonggong Tunnel, the surrounding rock deformation is controlled effectively, and the project is finished successfully.