| 衬砌渗透性对深埋隧洞渗流场及塑性区的影响 |
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| 引用本文： | 裴向辉,李宗利,杨明静.衬砌渗透性对深埋隧洞渗流场及塑性区的影响[J].中国农村水利水电,2013,0(4):75-79. |
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| 作者姓名： | 裴向辉 李宗利 杨明静 |
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| 作者单位： | 西北农林科技大学水利与建筑工程学院 |
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| 摘 要： | 将深埋隧洞简化为圆形轴对称模型,推导得到其渗流场和考虑渗透体积力的弹塑性解。以此为基础，通过衬砌与围岩渗透系数比值变化，对隧洞渗流场、塑性区和渗漏量进行分析，探讨衬砌渗透性影响。算例表明，当衬砌为透水材料时，衬砌及围岩内水头从外向内迅速减小，但当衬砌与围岩渗透系数比值大于50后，渗流场变化不再显著。隧洞渗漏量随衬砌与围岩渗透系数比值增大逐渐增大，但比值大于50后，趋于稳定值。对于存在初始塑性区的无压隧洞，当衬砌不透水时，衬砌的塑性区较大；塑性区随衬砌与围岩渗透性增大逐渐减小，并趋于稳定。对于存在初始塑性区的有压隧洞，保持内压不变，随着衬砌渗透性的增大，塑性区迅速加大，但当衬砌与围岩渗透系数比值大于50后，塑性区不再变化；对于无初始塑性区的隧洞，保持内压不变，衬砌的渗透性对塑性区发展影响较小。
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| 收稿时间： | 2012-11-22 |
| 修稿时间： | 2012-12-06 |
STUDY ON THE INFLUENCE OF LINING PERMEABILITY ON DEEP TUNNEL FLUID FLOW FIELD AND PLASTIC ZONE |
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| Abstract: | It is assumed that deep-buried circle tunnel is axial symmetry, fluid flow field and elastoplastic solutions were obtained under considering fluid flow body force. Analysis of the changes of the fluid flow field, plastic zone and leakage flow, the exploration about the impact of the lining permeability were obtained through different permeability coefficient ratios of the lining and surrounding rock based on the elastoplastic solution. A case result showed that the head of lining and the surrounding rock decreased rapidly from inside the tunnel to outside when the lining was permeable material. The change of the fluid flow field was no longer significant when permeability coefficient ratio of the lining and surrounding rock was beyond 50. Leakage flow increased gradually along with the permeability coefficient ratio of lining and surrounding rock increasing, and when the ratio was beyond 50, leakage flows keep a stable value. For the free flow tunnel with initial plastic zone existed, the plastic zone of impervious lining was larger than the plastic zone of pervious lining, the plastic zone decreased gradually and stabilized eventually along with the increasing of lining permeability. For the pressurized tunnel with initial plastic zone existed, the plastic zone would increase sharply based on the initial zone as increasing of lining permeability and keeping tunnel pressure constant as well. The plastic zone uncharged as permeability coefficient ratio of the lining and surrounding rock was beyond 50. For the free flow tunnel without initial plastic zone existed, lining permeability could not change the plastic zone as keeping tunnel pressure constant. |
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