压力隧洞钢筋混凝土衬砌开裂数值模拟研究

发布时间：2018-12-25 14:16

【摘要】：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。
[Abstract]:Based on the direct solution of the number of cracks and the width of cracks in the lining, the cracking of concrete lining, the effect of reinforcing bar, the bond slip between reinforcement and concrete and the effect of surrounding rock are considered. The numerical model of reinforced concrete lining cracking in pressure tunnel is established and the corresponding calculation program is worked out. The numerical simulation of the crack of reinforced concrete lining in pressure tunnel is carried out by using this program. The influence of the quantity of reinforcement and the condition of surrounding rock on the number and width of crack is analyzed and compared with the current code. The results show that the model can reflect the stress characteristics of the reinforced concrete lining of pressure tunnel as underground structure, and the surrounding rock condition has obvious influence on the number and width of cracks. The key to limit crack of reinforced concrete lining in pressure tunnel is to improve the surrounding rock condition, so it is not suitable to increase the amount of reinforcement blindly. The research results have certain guiding value to the practice of pressure tunnel engineering.
【作者单位】：华南农业大学水利与土木工程学院;中山大学岩土工程与信息技术研究中心;
【基金】：国家自然科学基金项目(41530638,41372302,51209237) 广东省高层次人才计划项目(20143900042010003)
【分类号】：TV554

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