地表倾斜条件下浅埋暗挖隧道的地表沉降规律

采用数值计算的方法，对地表倾斜条件下V级围岩双线铁路隧道浅埋暗挖施工诱发的地表沉降规律进行了研究。研究表明：地表倾斜时的沉降曲线不再具有对称性，地表沉降量最大点的位置随横坡的变陡由拱顶上方逐渐向上坡侧偏移；拱顶埋深相同的条件下，地表倾斜时的最大沉降量比地表水平时的大，并随横坡的变陡近似呈线性增加；地表倾斜时，上坡侧的地表沉降区宽度比地表水平时的大并随横坡的变陡逐渐增大，下坡侧的地表沉降区宽度比地表水平时的小并随横坡的变陡逐渐减少；地表倾斜引起的沉降区宽度变化，上坡侧比下坡侧的大。为隧道施工提供了理论指导。

A Study of the Law of Ground Subsidence in Shallow-Embedded, Under-Excavated Tunnels Under the Inclined Ground Surface

A numerical computation method is used in this paper to study the law of ground subsidence caused by a shallow-embedded, under-excavated tunnel of a double-line railway,which is located in the surrounding rock of Class-V under the inclined ground surface. The result of our research shows that the ground subsidence curve in the shallow-embedded tunnel under the inclined ground surface is no longer symmetric, the position of the maximum subsidence shifts from the position on the apex of the arch crown to the uphill side gradually as the transverse slop becomes steep;under the conditions of being the same in the embedded depth of the arch crown, the maximum subsidence under the inclined ground surface is greater than that under the horizontal ground surface, and nearly linearly increases with the rise in the slope gradient of the transverse slope; when it was under the inclined surface, the width of the ground subsidence zone on the uphill side is greater than that under the horizontal ground surface, and increases with the rise in the slope gradient; similarly, it is smaller on the downhill side and decreases with the fall of the slop gradient; the width variation of the ground subsidence zone caused by the slop gradient of the ground surface is greater on the uphill side than that on the downhill side. The paper may serve as a useful reference for other similar projects.