| 石钰锋,傅琼华,高江林,张晗秋.水工压力隧洞衬砌顶部脱空区对衬砌内力影响分析[J].江西水利科技,2016,(3):157-161 |
| 水工压力隧洞衬砌顶部脱空区对衬砌内力影响分析 |
| The Influence Analysis of Void on the Top Lining of the Pressure Hydraulic Tunnel to the Lining Stress |
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| DOI： |
| 中文关键词: 有压隧洞 内水压力 空洞 数值分析 |
| 英文关键词: pressure hydraulic tunnel internal hydraulic pressure void numerical analysis |
| 基金项目: |
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| 中文摘要: |
| 针对水工隧洞衬砌顶部可能出现脱空的现象，在对其原因初步探析基础上，应用ABAQUS建立拱部衬砌存在脱空的隧洞模型，计算分析不同内水压力下，脱空区大小对衬砌内力的影响，并对其安全性进行评价。计算表明：（1）拱部衬砌背后脱空对其受力影响显著，无内水压力时，应力较之无脱空工况可增长数倍，内水压力为0.5MPa时，弯矩较之无脱空工况增长5.5倍，与之对应，衬砌拱部安全系数降低显著。（2）衬砌拱顶安全系数随空洞及内水压力增大而减小，脱空区增大对应安全系数减幅较小，而内水压力增大对应安全系数减幅较大，衬砌安全对水压变化敏感。 |
| 英文摘要: |
| For the voids emerged behind the lining to the handful of pressure hydraulic tunnel, established a model by ABAQUS contains a void at top lining based on the exploration of the cause of cavity. In this paper, the internal force and displacement of lining was analyzed with varying the scope of the void at different internal hydraulic pressure, and evaluated the safety of lining under this condition. The computation shows that (1) cavity behind the lining has a significant impact on the internal force of lining. When the internal hydraulic pressure was not existed, compared with none cavity condition, the axial force of lining may be changed several times. And with this condition, the bending moment of lining increases 5.5 times when the internal hydraulic pressure was 0.5MPa. At the same time, the safety factor of top lining decreased significantly. (2)The safety factor of top lining decreased with the cavity scope and internal hydraulic pressure increased. The reducing amplitude of safety factor was small when cavity scope increased, but it was big when internal hydraulic pressure increased. The safety of lining was sensitive to internal hydraulic pressure changed when top cavity existed. |
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