浅埋回填土隧道开挖的拱顶和地表沉降控制探讨

通过监控量测预测了隧道冒顶和塌方,采用地面压浆和旋喷桩对隧道围岩进行改良固结处理后,洞内变形得到有效控制,而地面变形仍然较大。在注浆过程中,未垮塌段注浆引起的地面沉降比垮塌段小,而掘进过程中,未垮塌段掘进引起的地面沉降比垮塌段大。

Inquiring into Vault and Surface Subsidence Control in Excavation of Tunnel with Shallowly-buried Back Filling Soil

The roof fall and landslide of the tunnel was predicted through monitoring and measurement, the consolidation treatment for the surrounding rock of the tunnel was conducted by surface forcing grouting and rotary shotcrete pile, the deformation in the tunnel was effectively controlled, but the surface deformation above the tunnel is still larger. In the process of grouting, the surface subsidence caused by the grouting in the section which not caved is smaller than that in the caved section, but in the drivage process, the surface subsidence caused by the drivage in the section which not caved is larger than that in the caved section.