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应用地下深埋隧道渗流场和考虑渗透体积力的弹塑性解,结合某工程实例分析衬砌与围岩渗透系数不同比值对隧道渗流场、渗漏流量、塑性区、位移和衬砌围岩压力等影响规律,探讨透水性衬砌的可行性和合理渗透系数取值。实例分析表明,当衬砌为不透水材料时,洞周围岩中孔隙水压、塑性区、塑性区边缘的位移和衬砌承受的围岩压力均最大;若稍增加衬砌渗透性,则孔隙水压、塑性区、塑性区边缘的位移和衬砌承受的围岩压力迅速减小;随衬砌渗透系数与围岩渗透系数比值的逐渐增大,趋于稳定值。分析结果进一步表明,采用透水性衬砌是可行的,且当衬砌渗透系数与围岩渗透系数比值等于或大于1.0时较为合理。最后,针对洞周环境要求的渗流量以及钢筋混凝土衬砌的耐久性问题提出衬砌环的设计思想,并探讨具体工程措施,以便工程设计参考。
Using the seepage field of deep underground tunnel and the elastoplastic solution considering the seepage bulk force, the effect of different ratios of the permeability coefficient of lining and surrounding rock on the seepage field, seepage flow, plastic zone, displacement and surrounding rock pressure of the tunnel is analyzed based on an engineering example Law, to discuss the feasibility of water-permeable lining and the reasonable value of permeability coefficient. The case study shows that when the lining is impermeable material, the pore water pressure, plastic zone and plastic zone edge displacements in the rock around the hole and the pressure of surrounding rock under the lining are the largest. If the lining permeability increases slightly, the pore water pressure, The displacement of plastic zone and plastic zone edge and the pressure of surrounding rock under the liner rapidly decrease. With the ratio of the permeability coefficient of surrounding rock and the permeability coefficient of surrounding rock gradually increasing, the stability tends to be stable. The results of the analysis further indicate that the use of water-permeable lining is feasible, and it is reasonable when the ratio of permeability coefficient to surrounding rock permeability is equal to or greater than 1.0. Finally, the design idea of lining ring is proposed according to the percolation volume required by the surrounding environment and the durability of the reinforced concrete lining, and specific engineering measures are discussed to facilitate the engineering design reference.