考虑结构性影响的黄土隧道围岩参数修正

摘要

Constructing loess tunnels is a common practice in loess region .Due to the large proportion of loess in the sur-rounding rockmass ,loess tunnels are threatened by a series of common hazards .In order to solve these problems ,some laboratory tests were conducted from the perspective of the loess structure .And then based on the test results ,FLAC3D numerical simulation and parameter inversion were adopted to revise the design parameters of 4 surrounding rock grades of loess tunnels .The results indicate that the deformation value of the tunnel with the consideration of the loess structure is larger than that without considering the effect of the loess in the surrounding rock .In the adaptive equalization of the con-ventional design parameters of the surrounding rock ,the revised design parameters with the consideration of the effect of loess structure was proposed .%黄土隧道是黄土地区的一种常见工程，因其围岩为黄土而尽显特殊。针对黄土隧道常见病害，从黄土结构性角度出发，结合室内试验分析结果，通过FLAC3D数值模拟和参数反演，对四种围岩级别黄土隧道设计参数进行修正。研究结果表明：考虑黄土结构性影响时隧道围岩变形值均大于未考虑时的值；对传统围岩设计参数等效化处理，提出了考虑黄土结构性影响时的隧道围岩设计参数修正值。