富水强风化花岗岩隧道突泥涌水治理技术

Treatment Technology for Mud and Water Inrush in the Highly Weathered Granite Tunnel of Fushui

为保障施工人员安全,确保施工顺利进行,开展云南临沧董家湾隧道富水强风化花岗岩室内试验,结合施工条件分析涌水突泥致灾机理,得出其关键在于降低地下水压、减少围岩含水率以及提高围岩承载能力。提出以超前地质预报、综合降排水、洞内分阶段超前注浆为预防手段,封闭掌子面及施作临时封堵墙、泄压及清理、反压回填、临时仰拱钢架安装、注浆加固为处治措施的涌水突泥防治技术方法,为类似工程灾害防治提供技术参考。

In order to ensure the safety of construction personnel and the smooth progress of construction,indoor tests were conducted on the highly weathered granite of Dongjiawan Tunnel in Lincang,Yunnan.Based on the analysis of construction conditions,the mechanism of water inrush and mud induced disasters was determined.The key lies in reducing groundwater pressure,reducing the water content of surrounding rock,and improving the bearing capacity of surrounding rock.It is proposed to use advanced geological prediction,comprehensive drainage,and phased advanced grouting inside the tunnel as preventive measures.The technical methods for preventing and controlling water and mud inrush,including sealing the palm face,temporary sealing walls,pressure relief and cleaning,backpressure backfilling,installation of temporary inverted arch steel frames,and grouting reinforcement,provide technical references for similar engineering disaster prevention and control.