以安峰隧道左线洞口段为研究对象，利用数值模拟和现场监测的方法，对强风化岩层浅埋偏压隧道在不同施工方案下的围岩变形和地表沉降规律进行研究。研究结果表明，浅埋偏压隧道施工引起的地表沉降曲线呈非对称分布，隧道深埋侧的地表沉降影响范围更广。经过方案比选，安峰隧道浅埋偏压段采用超前管棚支护下的双侧壁导坑法进行施工更有利于控制围岩变形。现场监测数据与数值计算反应的结果较为吻合，研究结果具有一定可靠性。
Features of tunnel deformation, ground settlement and plastic-zone distribution under different construction methods are analysed, based on the Anfeng tunnel. The study shows that the curve of ground settlement is not symmetrical and the affected area of deep-buried side is farther than the shallow-buried side. The plastic zone concentrates near the connection direction between arch foot of deep-buried side and arch waist. By comparison, both side drift method under advanced shed-pipe support can control the deformation of tunnel effectively. Results of field monitoring coincide with the numerical results, which prove the numerical results are reliable. The study can provide reference for design and construction of tunnel with unsymmetrical loadings.
