注浆作用下渗漏水对隧道和地层沉降影响

LeakageInduced Ground and Tunnel Response Considering the Effect of Grouting

摘要:

基于衬砌注浆层土层相对渗透系数，提出了能够综合反映注浆体和隧道衬砌共同作用的相对渗透系数.通过数值模拟，建立了该系数与隧道渗漏引起的衬砌受力、变形和地层位移之间的关系.在此基础上，建立了能够考虑注浆影响的评价方法，该方法能够基于隧道完全渗水和完全不渗水两种极端条件预测隧道有限渗水对地层和隧道结构的影响.

Abstract:

The effect of grouting on tunnel leakage was studied in terms of the leakageinduced settlements of ground and tunnel, and the convergence and internal forces of tunnel, using FEM simulation. Based on the numerical results, a dimensionless parameter R integrating the permeability and geometry of grouting and tunnel lining was suggested to study the effect of grouting. Using this parameter, the effect of grouting on tunnel leakage can be predicted. Moreover, the permeability state of fully impermeable, infinite permeable and fully permeable could be defined in terms of the values of R. The numerical simulation indicates that the leakageinduced internal forces is negligible and may not affect the tunnel safety from the point of view of tunnel bearing capacity