以下穿岩堆段的丽香铁路黄山哨隧道为工程依托，对岩堆段地表开裂及洞内初期支护边墙严重变形的问题进行研究。地表埋设6根测斜管监测地表位移情况，洞内布置3个断面进行围岩压力、钢架内力、二次衬砌内力、初期支护与二次衬砌间的接触压力、锚杆轴力量测。在分析现场岩堆段洞内外受力机制及原因的基础上，根据数值计算结果优化二次衬砌断面型式及进一步加大二次衬砌厚度及配筋。采取以下措施控制隧道岩堆段变形： 1）地表岩堆土石接触面开裂处增设截排水措施； 2）加大隧道初期支护钢架型号及加长岩堆侧边墙径向系统锚杆； 3）加大隧道边墙轮廓曲率并优化隧道二次衬砌型式为圆顺型； 4）隧道预留变形量加大至30 cm； 5）隧道二次衬砌内净空预留50 cm补强空间； 6）隧道拱部设置42小导管超前支护。现场岩堆段采取以上措施后已顺利施工通过，根据洞内外监测结果显示，结构在安全可控范围内。

The problems encountered during construction of Huangshanshao Tunnel on LijiangShangrila Railway crossing underneath rockpile section, i.e. surface cracking, serious sidewall deformation of primary support, etc., are studied. The surface displacement is monitored by 6 clinometers on ground, and 3 sections are arranged in the tunnel to measure the surrounding rock pressure, steel frame internal force, secondary lining internal force, contact pressure between primary support and secondary lining, and anchor axial force. Based on the analysis of the internal and external forces acting on the rockpile section, the crosssection type of secondary lining is optimized according to the numerical results, and the thickness and reinforcement of secondary lining are further increased. The following measures are adopted to effectively control the deformation of the rockpile section that tunnel crosses: (1) using the drainage and interception measures at cracks of earthrock interface of surface rockfill; (2) increasing the type of primary supporting steel frame and the length of radial system bolt at sidewall of rockpile section; (3) increasing the curvature of tunnel sidewall contour and optimizing the tunnel secondary lining type to round concurrent type; (4) increasing the reserved deformation of tunnel to 30 cm; (5) reserving 50 cm reinforcement space for tunnel lining clearance; (6) setting advance support of tunnel arch with 42 small conduit. After adopting the above measures, the tunnel has successfully crossed the rockpile section. According to the monitoring results inside and outside the tunnel, the structure is within the safe and controllable range.