广东地区某公路岩溶隧道水害分析及其数值模拟研究

摘要

The key factors to calculate the tunnel water inflow are studied based on the actual situation of a highway tunnel in the karst area.The tunnel water inflow rate is quantitatively analyzed with precipitation, rainfall intensity and infiltration intensity.According to the actual situation of Dabaoshan engineering site, precipitation infiltration method and underground runoff modulus method are applied to calculate the tunnel water inflow at the entrance on both sides in the wet season,and the maximum possible water inflow volume is analyzed under the heavy rainfall condition.The results show that the drainage capacity of the tunnel theo-retically meets the requirement of drainage in the wet season,but will be affected by the heterogeneity of the material and the engineering,and the long-term effect of clogging. The impact factors of karst tunnel water in highway are identified in Guangdong area.Karst tunnel sim-ulation models are established for both critical state and failure state of the water pressure.The results show that the critical value of water pressure increases with the thickness of the lining structure.%结合岩溶区公路隧道的实际情况,研究隧道涌水量计算的关键因素,并通过降水量、降水强度和入渗强度定量分析隧道涌水量.文章根据大宝山的实际情况,采用降水入渗法和地下径流模数法计算隧道两侧洞口段雨季涌水量,针对强降水过程,分析隧道可能出现的最大涌水量.研究结果表明:隧道排水能力理论上可满足降雨的排水要求,但实际排水能力受工程施工材料、工程的不均匀性以及长期的淤堵等因素影响.文章明确了广东地区公路岩溶隧道水害影响因素,考虑临界状态和破坏状态的水压力建立岩溶隧道涌水模拟模型,水压力临界值随隧道衬砌结构厚度的增加逐渐增大.