College of Civil Engineering and Transportation,Liaoning Technical University,Fuxin　 123000,China

由于采动荷载和爆破荷载对已有支护锚杆产生影响,因此迫切需要研究锚杆在动荷载作用下的微观力学特性及黏结性变化。从工程实际出发,现场监测锚杆工作状态下轴力变化和爆破荷载作用下锚杆周边围岩振动信息,并开展探索性室内试验。通过室内试验获得锚杆在轴向荷载作用下横向固有频率振动后的振动强度与工作龄期耦合作用下锚杆黏结性衰减规律的拟合计算式。研制了横向简谐荷载作用下端锚黏结式锚杆模型试验装置,采用均匀设计方法,考虑锚杆长度和锚杆直径两个影响因素,通过动态监测系统获得了横向简谐荷载作用下锚杆应力沿锚杆长度的分布规律、锚杆应力分布与拉拔力的关系,以及剪切应力与位移的关系。最终采用大型有限差分软件FLAC3D,建立了锚杆与围岩相互作用的力学模型。

There is an urgent need to study the micro mechanical properties and the adhesion variation of bolt under dynamic load as a consequence of the effect of mining load and blasting load on the existing bolt supporting. Based on engineering practice,the axial force variation under working conditions and the vibration information of surrounding rock around anchor bolt under the load of blasting vibration were monitored. Formula was obtained through indoor test for calculating the attenuation law of anchor bond in anchor rod under the coupled action of the working age and the vibration strength with lateral vibration inherent frequency under axial loads. In addition,a device was developed for conducting anchors grouted bolt model experiment under transverse harmonic loads. Using the uniform design method, considering two influencing factors including bolt length and bolt diameter,through dynamic monitoring system,the bolt transverse harmonic load stress distribution along the length of anchor bolt,the relationship between stress distribution and drawing force,and the relationship between shear stress and displacement were obtained. Finally,using software FLAC3D ,the mechanical model of bolt and rock interaction was established.

国家自然科学基金煤炭联合基金资助项目(51174268)；

Zhang Zhecheng,Zhang Xiangdong,Liu Yuanhao,et al. Experimental research of anchors bonding mechanical properties under transverse harmonic loads[J]. Journal of China Coal Society,2016,41(6):1407-1415.