摘要
隧道外水压力是进行隧道衬砌设计的重要因素。目前,外水压力的确定还是采用根据当地的地下水位折算外水压力的折减系数方法。这是一种粗略的折算方法,并不十分恰当。根据隧道周围岩层的水文、地质条件建立模型,采用三维拟连续介质渗流理论,通过数值计算来确定围岩衬砌上的外水压力场。工程实例计算了隧道围岩岩性为均匀的和非均匀的岩层内部的水头场分布,并设计不同的排水方案,通过计算比较了各种排渗方案的排水效果。结果显示,该方法用来确定隧道衬砌外水压力是可行的。
The external water pressure of tunnel is an important factor for tunnel lining design. At present, the method of the coefficient of reduction, which is not accurate and appropriate, is used to determine the external water pressure. In this paper, a 3D pseudo-continuum model of seepage and the analysis method of drain holes is established according to the geohydrologic condition of a tunnel. In the example, the distribution of external water pressure is changed with the distribution of rock strata around the tunnel and the drainage schemes. The results show that the effect of the scheme is the best one when the drainage hole is jointed to the severe leakage rock seam, and that the model for determination of external water pressure of tunnel is feasible.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第A02期2375-2378,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金(50239010)
河海大学科技创新基金
关键词
隧道工程
外水压力
三维拟连续介质渗流模型
排水
tunneling engineering
external water pressure
3D pseudo-continuum model of seepage
drainage
