| 锁脚锚管对土质隧道围岩变形和支护内力的影响研究 |
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| 引用本文： | 邓国华,邵生俊,陶虎,陈昌禄.锁脚锚管对土质隧道围岩变形和支护内力的影响研究[J].土木工程学报,2010(1). |
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| 作者姓名： | 邓国华 邵生俊 陶虎 陈昌禄 |
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| 作者单位： | 西安市地下铁道有限责任公司;西安理工大学; |
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| 基金项目： | 国家自然科学基金(10872161); 陕西省教育厅基金资助项目(00K503) |
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| 摘 要： | 对比分析了锚杆和锁脚锚管的异同点,提出了锁脚锚管的数值模拟方法。通过三维有限元分析,研究了锁脚锚管对支护结构变形和内力的影响,揭示了锁脚锚管的作用机理,提出了判断锁脚锚管是否有效和合理的标准。研究表明锁脚锚管应通过约束其沿洞轴方向的转动自由度考虑,合理的锚管长度和打入角度不仅有利于限制围岩的变形,而且有助于支护结构承载能力的发挥,一般土质隧道的锁脚锚管长度宜取2.3~3.0m,打入角度宜取0°或30°。判断锁脚锚管是否合理时,可根据工程实际需要,结合承载能力发挥系数与位移限制系数确定。
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| 关 键 词： | 锁脚锚管 锚杆 隧道 支护内力 围岩变形 |
A study of the effects of locking tremies on the internal force of tunnel support and the deformation of surrounding soil |
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| Abstract: | The similarities and differences between locking tremies and bolts for tunnels are compared,and a numerical analysis method for locking tremies proposed.The influences of locking tremies to the internal force and deformation of tunnel support structures are studied by using three-dimensional finite element method.The reinforcement mechanism of locking tremies is discussed,and criterions for the effectiveness and rationality are proposed.It is shown that the locking tremies should be considered by confining ... |
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| Keywords: | locking tremie bolt tunnel internal force of supporting structure surrounding soils deformation |
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