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立足于直接求解压力隧洞设计所关注的衬砌裂缝条数和裂缝宽度,同时考虑混凝土衬砌的开裂、钢筋的作用、钢筋与混凝土间的粘结滑移以及围岩的作用,建立了压力隧洞钢筋混凝土衬砌开裂的数值模型,并编制了相应的计算程序。采用该计算程序对压力隧洞钢筋混凝土衬砌开裂问题进行数值模拟研究,分析了钢筋量、围岩条件对裂缝条数和裂缝宽度的影响,并着重与现行规范进行对比分析。结果表明,所建模型能反映压力隧洞钢筋混凝土衬砌作为地下结构的受力特性;围岩条件对裂缝条数和宽度均有明显影响;压力隧洞钢筋混凝土衬砌限裂的关键在于改善围岩条件,不宜盲目加大钢筋量。该研究结果对压力隧洞工程实践具有一定的指导价值。
Based on solving the pressure tunnel design concerns the number of lining cracks and crack width, taking into account the cracking of concrete lining, the role of steel, bond between the bar and concrete and the role of surrounding rock, established a pressure tunnel reinforced concrete Lining cracking numerical model, and the preparation of the corresponding calculation program. The calculation program is used to study the cracking of reinforced concrete lining of pressure tunnel. The influences of reinforcement amount and surrounding rock conditions on the number of cracks and the width of cracks are analyzed, and the contrastive analysis of these parameters is made. The results show that the model can reflect the stress characteristics of the pressure tunnel reinforced concrete lining as the underground structure; the surrounding rock conditions have a significant effect on the number and width of the cracks; the key point of the cracking of the reinforced concrete lining of the pressure tunnel is to improve the surrounding rock conditions, Should not blindly increase the amount of steel. The results of this study have some guiding value to the practice of pressure tunnel engineering.