摘要
现有海底隧道渗流场计算模型未考虑上覆土层对围岩压力水头的影响。本文采用保角变换法,根据层间流量相等原则求得在上覆土层条件下带衬砌隧洞的渗流量及其周边水头分布,并验证其可靠性。计算结果表明:(1)海底土层的渗透系数对渗透量影响较大,尤其当土层水力通道不佳时要考虑土层的影响;(2)衬砌水压力折减系数随衬砌渗透系数变化逐步趋于稳定,折减系数宜取其与渗透量的交线处,此时衬砌与注浆圈渗透系数比值kL/kg=0.075;(3)注浆圈比衬砌承担更大的水压力,注浆圈厚度加大能有效减小渗透量,当kL/kg<0.05时,注浆圈厚度的增加对渗透量影响不大。
In the existing subsea lining penetration calculation model, usually the overlying soil is omitted. In order to take into account the soil overburden, this paper presents a novel conformal mapping method, which is based on certain boundary conditions of subsea tunnels and on the assumption of continuous flow to solve the problem. Then, the validation of the method is revealed by its comparison with an existing analytical solution. The results indicate that ： （1）the overlying soil has effect on the amount of final inflow of the tunnel lining, especially when the soil permeability coefficient is a small value; （2） the water reduction coefficient becomes stable with the change of lining permeability coefficient, and its value should be selected at the intersection with the curve of inflow, where kL/kg = 0. 075 ; （3） the lining and grouting area resist together the water pressure and the grouting area takes more pressure. The thickness of the grouting area has hardly effect on the inflow when kL/kg〈0.05.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第2期499-504,共6页
Chinese Journal of Underground Space and Engineering
基金
国家重点基础研究发展计划项目(2011CB013605)
国家自然科学基金(51438004)
关键词
海底隧道
排水衬砌
渗流场解析
subsea tunnels
partially water-proof-type lining
analytical solution of seepage field
