基于预应力场分布的锚杆支护参数设计  

Design of Anchor Support Parameters Based on Prestressed Field Distribution

作　　者：王耀华 豆留盼 余涛[1] 满军 方勇[1] 姚志刚[1] WANG Yaohua;DOU Liupan;YU Tao;MAN Jun;FANG Yong;YAO Zhigang(MOE Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Second Bureau Sixth Engineering Co.Ltd.,Chengdu 610014,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]中铁二局第六工程有限公司,成都610014

出　　处：《铁道建筑》2024年第7期111-115,共5页Railway Engineering

基　　金：四川省科技计划(2024NSFTD0013);国家资助博士后研究人员计划(GZC20232194)。

摘　　要：为优化隧道施工预应力锚杆支护参数,通过模型试验与数值模拟相结合的方法研究Ⅳ级围岩条件下锚杆支护参数对预应力场分布的影响。结果表明:预紧力对锚杆预应力场的影响显著,预紧力越大,预应力场分布范围越大,锚杆主动支护作用越好;锚固长度过长会减小预应力场分布范围,锚固长度过短则不利于形成连续的压应力区,建议锚固长度取锚杆长度的30%~50%;锚杆间距越小预应力场叠加效应越明显,锚杆间距过小时在锚杆末端会出现拉应力区,建议锚杆间距取锚杆长度的42%。In order to optimize the support parameters of prestressed anchor in tunnel construction,the influence of support parameters of prestressed anchor on the distribution characteristics of prestressed field under the condition ofⅣsurrounding rock was studied by means of similar model test and numerical simulation.The results show that,the pretightening force has a significant effect on the prestressed field.The greater the pre-tightening force,the greater prestressed field distribution,and the better the active support effect of the prestressed anchor.If the anchorage length is too long,the prestressed field distribution in surrounding rock will be reduced,meanwhile,if the anchorage length is too short,it is not conducive to the formation of continuous compressive stress zone.It is suggested that the anchorage length should be 30%~50%of the anchor length.The smaller the anchor space is,the stronger the anchoring superposition effect is.However,when the anchor spacing is too small,there will be a tensile stress zone at the end of the anchor.It is suggested that the anchor spacing should be 42%of the anchor length.

关 键 词：隧道 预应力锚杆 支护参数 模型试验 数值模拟 预应力场 预紧力 锚固叠加 

分 类 号：U459[建筑科学—桥梁与隧道工程]