强-中风化砂岩层状岩体中抗浮锚杆承载力研究

Research on Bearing Capacity of Anti-floating Anchor in Rock Mass with Strong and Medium Weathered Sand

为有效解决城市地下空间抗浮问题,文中对中风化砂岩层状岩体中抗浮锚杆承载力进行研究。研究结果表明,当锚杆长度不大于15 m时,荷载-位移曲线表现为圆弧的形状,存在两个显著的转折点,锚杆的破坏阶段大致分成线弹性、弹塑性以及破坏三个阶段;当锚杆的长度大于15 m时,加载后锚杆的荷载-位移曲线仅存在一个转折点,锚杆的力学行为呈现为弹性及破坏两个阶段。锚杆长度的增加可有效降低相同荷载下的锚头位移,延长锚杆的弹性阶段,但锚杆长度存在极限值,该工程锚杆的长度极限值为16 m。

In order to effectively solve the problem of anti-floating in urban underground space,the bearing capacity of anti-floating anchor in rock mass with medium weathered sand is studied in this paper.The results show that when the length of the bolt is less than 15 m,the load-displacement curve shows an arc shape and there are two significant turning points.The failure stage of the bolt is roughly divided into three stages:linear elasticity,elastic-plastic and failure.When the length of the bolt is more than 15 m,the load-displacement curve of the bolt after loading only has a turning point,and the mechanical behavior of the bolt shows two stages:elasticity and failure.The increase of the length of the bolt can effectively reduce the displacement of the anchor head under the same load and extend the elastic stage of the bolt.However,the limit value of the length of the bolt exists,and the limit value of the length of the bolt in this project is 16 m.