锚杆挡固机理、破裂层及减短锚杆的研究

A STUDY ON THE RESISTING AND ANCHORING MECHANISM OF ROCK BOLTS,THE FRACTURED LAYER AND THE POSSIBILITY OF REDUCING BOLT LENGTH

本文根据由锚杆支护的受动压影响的回采巷道及锚喷支护的软岩巷道的表面及深部位移资料及数值分析,讨论了锚杆挡固机理.考虑这种机理、破裂层及其他一些资料,提出了减短的锚杆合理长度.

The displacements at tbe rock surface and within the rockmass were measuredin-situ in bolt-supported actual mining roadways which are influenced by abut-ment pressures and in shotcrete-bolt supported excavations in soft rocks. Basedon the displacement data and the results of correspouding numerical analys-is. the resisting and auchoring mechanism of rock bolts has been discussed.Moreover, according to the resisting and anchoring mechanism, the fracturedlayer and some other information, it is suggested that the bolt length can bereduced and a method for determining the reasonable bolt length is put forward.