铁路隧道下穿施工引起高速公路路基沉降规律研究

Study on Settlement of Highway Bed Due to Underground Construction of Crossing Railway Tunnels

铁路隧道下穿既有高速公路引起路基路面沉降,威胁交通安全。通过建立隧道-地基-路基相互作用计算模型,在路面荷载作用下,采用数值计算方法分析计算了隧道下穿深度、地层模量、泊松比及强度参数等因素与路基沉降变形规律之间的关系。计算结果表明,隧道下穿深度不仅影响路基沉降变形的大小,而且影响沉降槽的形状,而土层性质主要对路基沉降变形影响较大,对沉降槽形状影响相对较小。计算结果较好地反映了不同因素对路基沉降变形的影响,对类似工程的设计和施工具有参考意义。

Ground settlement due to construction of underground crossing railway is an important issue. In this paper, the influence of the tunnels depths, the elasticity modulus, Poisson＇ s ratio, and internal friction angle of the sub grade soil property to the ground settlement during construction is simulated by the numerical simula- tion method. Some conclusions are drawn. Firstly, the tunnels depth does not only influence the growth of the ground settlements, but also the shape of traverse settler. Secondly, the sub grade soil properties mainly affect the larger settlement; the shape of the settlement trough is relatively small.