| 石钰锋,傅琼华,庄锦彬,彭圣军.有压隧洞仰拱与边墙连接弱化对衬砌支护特性的影响研究[J].江西水利科技,2018,(1):9-14 |
| 有压隧洞仰拱与边墙连接弱化对衬砌支护特性的影响研究 |
| Study on the influence of the lining support characteristics of the pressure tunnel which has the weakened connection between the inverted arch and the side wall |
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| DOI： |
| 中文关键词: 有压隧洞 连接弱化 支护特性 数值模拟 |
| 英文关键词: Pressure hydraulic tunnel Weakening connection Supporting characteristics Numerical analysis |
| 基金项目:江西省青年科学基金项目;江西省自然科学基金项目 |
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| 中文摘要: |
| 仰拱与边墙连接处的施工质量对衬砌结构以及围岩的力学状态有重要影响.通过FLAC2D有限差分软件，建立仰拱与边墙连接弱化的隧洞模型对隧洞支护结构力学行为进行分析，在0.5 MPa以下内水压工况的研究结果表明：(1)衬砌按照弹性结构单元计算时，仰拱与边墙连接弱化对衬砌受力影响有限，弱化程度加深后影响有所增大，但不显著；(2)衬砌按照弹塑性实体单元计算时，弱化区域附近围岩侧衬砌边缘随弱化程度加深出现压应力集中；(3)衬砌在围岩压力及内水压力复合作用下，衬砌内力随内水压力增大呈减小趋势. |
| 英文摘要: |
| The construction quality of the connection between the inverted arch and the side wall has an important influence on the lining structure and the mechanical state of the surrounding rock.The tunnel model which has a weakening connection between the inverted arch and the side wall is established through the FLAC2Dto analyze the mechanical behavior of the tunnel support structure.The results of the water pressure operating conditions under 0.5MPa of hydraulic tunnel are shown：(1)when the lining is calculated as elastic structure unit，the influence of the connecting weakening between the invert and the side wall on the lining is limited.The effect of the deepening of the weakening is increased，but not significant.(2)when the lining is calculated as elastic-plastic solid unit，the lining edge near surrounding rock within the weakening region appear compressive stress concentration when the weakening degree deepen.(3)Effected by the surrounding rock and internal water pressure，The lining internal force decreases when the internal water pressure increased. |
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