隧道锚与下方连拱隧道联合施工相互影响研究

Research on the Interaction of Joint Construction of Lower Tunnel Anchor and Multi-arch Tunnel

隧道锚与连拱隧道重叠区域的围岩变形和应力状态极其复杂,因此研究其相互间影响具有非常重要的意义.现以四坪隧道和开州湖特大桥开阳岸隧道锚施工顺序为研究对象,采用数值分析的方法对隧道和隧道锚的开挖顺序进行研究.研究结果表明:两种不同施工顺序下,围岩的变形差别不大,均在安全范围内.连拱隧道与隧道锚间的塑性区并未贯通,开挖并未导致围岩的进一步破坏.根据隧道和隧道锚的沉降监测以及爆破振动监测,相互间的施工影响均在可控范围内,爆破振动影响可忽略不计.

The deformation and stress state of the surrounding rock in the overlapping area between the tunnel anchor and the double-arch tunnel are extremely complex,so it is of great significance to study their mutual influence.Taking Siping Tunnel and Kaizhou Lake Extra Large Bridge Kaiyangan Tunnel anchor construction sequence as the research object,the numerical analysis method is used to study the excavation sequence of tunnels and tunnel anchors.Research indicates that under the two different construction sequence,the deformation of surrounding rock is not different,both of them are safe range.The plastic zone between the double-arch tunnel and the tunnel anchor did not penetrate,and the excavation did not cause further damage to the surrounding rock.According to the settlement monitoring and blasting vibration monitoring of tunnel and tunnel anchor,the mutual construction influence is within the controllable range,and the blasting vibration influence can be ignored.