深埋山岭隧道帷幕注浆段衬砌外水压力研究

通过建立深埋山岭隧道的渗流模型,分析外水压力对支护体系的荷载影响,推导出帷幕注浆段衬砌外水压力的计算公式以及隧道内最大涌水量公式,并就理论公式结合工程实际情况展开探讨。同时,对太行山隧道帷幕注浆段外水压力进行现场测试。测试数据表明,由于监测时间较短、测点选择等原因,虽然帷幕注浆段衬砌外水压力较小,但考虑到后期外水压力的增加,为确保隧道运营期安全,需加强高压富水段外水压力持续监测。

Study on External Water Pressure of Lining in Curtain Grouting Section of Deep-buried Tunnel

The flow model of deep-buried tunnel is established in this paper to analyze the influence of the external water pressure on the load of supporting system. The two calculation formulas,water pressure on the outer lining structure and the equation of maximum water inflow,are derived from theoretical analysis. On the basis of the obtained equations,this paper addresses the applicability of these equations to the actual tunnel construction. The external water pressure on the outer lining structure is monitored in the curtain grouting section of Taihang Mountain. The monitoring results indicate that though the water pressure on outer lining structure in curtain grouting section is small,continuous monitoring of external water pressure in rich water sections must be reinforced in view of the future increase of water pressure and the safety of tunnel service.