| 王忠昶,杨庆,赵德深.预应力锚固机制数值模拟研究[J].,2009,(2):254-260 |
| 预应力锚固机制数值模拟研究 |
| Numerical simulation study of pre-stress reinforcement mechanism |
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| DOI：10.7511/dllgxb200902017 |
| 中文关键词: 预应力 数值模拟 拉应力区 锚固 |
| 英文关键词: pre-stress numerical simulation tension stress zone reinforcement |
| 基金项目:国家自然科学基金资助项目(50678032,50574016)；辽宁省教育厅基金资助项目(2008z030). |
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| 中文摘要: |
| 针对预应力锚索加固时锚固段与自由段受力机制的不同，依据等效应变和等效温度法建议了一种新的预应力施加方法，并采用有限元方法模拟了预应力锚索加固岩体的受力机制．给出了不同锚固条件下锚固段和岩体的受力变形特征，指出了应用预应力锚索加固时应该注意的问题 张拉式预应力锚索加固的岩体在内锚固段周围的岩体是受拉的，群锚时使得内锚固段附近的岩体形成拉应力带，这种拉应力带对岩体的稳定十分不利，应积极采用不等长锚索，以使内锚头分散布置在岩体的不同层位中；群锚条件下锚索之间外锚头位置岩体有受拉现象，在满足工程需要的条件下锚索的布置间距应适当放大． |
| 英文摘要: |
| A new method of equivalent pre-stress is suggested by using the methods of equivalent strain and temperature according to different working mechanisms between free segment and the consolidated segment of pre-stress anchor cable. The mechanism for reinforcement of pre-stress anchor cable is simulated by finite element. The mechanical and distortional character of the consolidated segment and rock mass under different consolidated conditions are presented. Some attentions to using pre-stress anchor cable are indicated. Rock mass around the consolidated segment sustains tension and tension band is formed on account of being consolidated by multi-anchor cables, and this is harmful to the stability of rock mass. Therefore, the anchor cable of unequal length should be used to avoid the anchor in arrangement of the same rock layer. The space between anchor cables should be widened under the conditions of satisfying the need of engineering owing to sustaining tension of rock mass between outer-end of anchor cables. |
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