公路软岩隧道底鼓注浆加固厚度数值模拟

Numerical Simulation of Grouting Thickness Applied to Floor Heave in Soft Rock Highway Tunnel

通过对某位于构造剥蚀沉积岩低中山区高速公路隧道的全面检测,分析隧道产生底鼓的原因,采用FLAC3D模拟不同厚度仰拱时围岩塑性区变化情况,分析仰拱厚度不足对隧道的危害,验证隧道全断面注浆的可行性。通过计算模拟不同厚度的注浆圈,提出合理的注浆圈厚度,为施工及加固提供一定的技术参考。

To analyze the reason that floor heave occurs,a highway tunnel located among the eroded sedimentary rocks in low or medium mountains is overhauled. FLAC3 D is used to simulate the changes in plastic zones of surrounding rocks with different thickness of arch. The harms to the tunnel is analyzed to reduce thickness of inverted arch and the feasibility of full-face tunnel grouting is verified. Through the numerical simulation of different thickness of grouting circles,the reasonable thickness of grouting circle is proposed,which provides a technical reference for construction and reinforcement