山岭地区隧道涌水量预测计算方法的应用分析

研究目的:山岭地区隧道基岩裂隙水的涌水量计算,至今仍是一项需要不断深入研究的课题.传统的地下水动力学法,与实践中应用的地下径流模数法、水文学法、降水入渗法均经过模型概化,或以均质介质进行解析,显然存在一定的缺陷.研究结论:为使涌水量的预测计算更趋于实际、合理与科学.结合工程实践认为,在考虑到裂隙的折减、边界条件等的不对称性时,稳定流宜采用分部叠加法计算,非稳定流宜选择符合实际的渗透系数和含水层厚度进行计算；地下径流模数法应以分析地貌、构造条件为基础,利用有效汇水面积预测涌水量；水文学法具有宏观估算作用,不宜用于定量评价；条件具备时,应建立数值模型计算方法,尤其是三维流的数值模型计算.

Applicable Analysis of Calculation Method for Prediction of Water Bursting Volume of Mountain Tunnel

Research purposes: The calculation of water bursting volume from the fissure of the foundation rock of mountain tunnel is a matter to be further studied.The traditional underground water dynamic method,underground runoff simulation method,hydrology method and precipitation method have some defects because of the model generalization or homogenized medium resolution. Research conclusions:In order to make the prediction of water bursting volume more closed to the real situation,more reasonable and more scientific,on consideration of the strength reduction factor of the fissure and the asymmetry of the boundary condition,the calculation should be made for the steady flow with the parcel superposition method,the calculation should be made for the non-steady flow with the osmotic coefficient that conforms to the real situation and thickness of the water-bearing stratum,the water bursting volume should be predicted by using the effective catchment area when the underground runoff method is used on the base of the analysis the topographic and structural conditions,and the hydrology method has macro estimate role,so it is unsuitable to be used for the quantitative evaluation.When the condition is allowable,the numerical model should be established for calculation,especially to establish the 3D flow numerical model.