西部公路路基内部排水效果模拟研究

以半挖半填路基为例，讨论了各类地质单元与路基系统的作用及路基系统内部地下水运动特征，着重分析了地下水对路基边坡稳定性的控制作用，通过敏感性分析，阐明了降低路基边坡地下水位的必要性，研究了地下水对路基系统的作用机理；建立了路基排水的数学模型，对影响路基排水的降雨强度、渗沟间距、排水时间等因素进行了敏感分析；通过对路基系统渗透系数、入渗系数、降雨量及初始水头的不同取值，运用Modflow软件对排水效果进行了模拟；通过工程实例，验证了路基排水设计方案的合理性。

Simulation study of drainage effect inside roadbed of expressway in the west of China

Taking roadbed digging and stowing as an example,the paper discusses the relationship among various geological units and roadbed system as well as the moving feature of groundwater inside roadbed system,emphasizes the controlling function of groundwater to the roadbed slope.Sensitivity analysis result shows the necessity of lowering groundwater level in the slope of roadbed,and further expounds the mechanism of the action of groundwater to the roadbed system.Mathematical model of roadbed drainage has been established,sensitivity analysis on the intensity of rainfall,the space between blind ditches and the drainage time has been conducted respectively.Drainage effect has been simulated with Modflow software by giving different values of hydraulic conductivity,permeable coefficient,intensity of rainfall and initial hydraulic head of the system.It has been proved by engineering cases that the drainage design is reasonable,a new way for studying the drainage effect of roadbed in the west of China has been put forward.