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锚杆在支护大变形隧道工程时常因变形过大而发生拉断破坏,为推广可延伸性锚杆在大变形隧道中的应用,提出了恒阻挤压滑移让压锚杆,通过挤压并拉伸锚杆杆体来消耗高地应力引起的围岩形变能量,实现让压功能;通过调整挤压套的位置、握裹力,可以依据具体大变形隧道工程的围岩特性,调节让压锚杆的让压荷载、最大让压量。通过室内试验,证明了恒阻挤压滑移让压锚杆让压装置可靠性,获得了恒阻挤压滑移让压锚杆力学特性。以兰渝线毛羽山隧道为应用工程,试验结果表明:让压锚杆在大变形隧道工程中可以保证可靠的让压效果;在软弱不良大变形隧道工程中,宜采用注浆等手段以保证让压锚杆的有效支护性能;让压锚杆可以有效控制围岩变形,保证大变形隧道中围岩的收敛效果。
In order to promote the application of extensible rock bolts in large deformation tunnels, the anchor rod is often pressed and shrunk by pressure so as to push the anchor rod through squeezing Compressing and stretching the anchor rod body to consume the deformation energy of the surrounding rock caused by high ground stress so as to achieve the pressure-relief function; by adjusting the position of the extrusion sleeve and holding the cover force, the allowable pressure can be adjusted according to the surrounding rock characteristics of the concrete tunnel with large deformation Bolt let pressure load, let the maximum pressure. Through laboratory experiments, it is proved that the constant resistance extrusion slip makes the reliability of the pressure bolt making pressure device, and the mechanical properties of the pressure bolt are obtained by the constant resistance squeeze slip. Taking the MaoYuShan Tunnel of LanZu Line as the application project, the experimental results show that the pressure-relief bolt can ensure the reliable pressure-relief effect in the large deformation tunnel project. In the weak deformation large deformation tunnel project, grouting should be used to ensure So that the effective pressure bolt supporting performance; allow the pressure bolt can effectively control the deformation of surrounding rock to ensure the large deformation of the surrounding rock convergence effect.