Rock bolting technique is an important reinforcement measure in the geotechnical engineering practice.New rock bolts have been continuously emerging through the development of rock supporting technology.Complex condit...Rock bolting technique is an important reinforcement measure in the geotechnical engineering practice.New rock bolts have been continuously emerging through the development of rock supporting technology.Complex conditions,such as high crustal stress,extremely soft rock,and strong mining disturbance often occur in the deep mining,resulting in large deformation of the surrounding rock masses.Since the deformation of traditional rock bolts is generally below 200 mm,failure often occurs to the rock bolts because of insufficient deformability.To effectively control the large deformation of surrounding rock masses caused by complex conditions,it is necessary to develop large deformation rock bolts with high constant resistance,also called energy-absorbing bolts.This paper systematically reviews the development of large deformation rock bolts and the structure,energy absorption mechanism,anchorage performance,and mechanical properties of several typical large deformation rock bolts.The advantages and disadvantages of existing large deformation rock bolts are compared and the concept of constant resistance large deformation support is introduced.展开更多
基金financial supports from the Key Special Project of National Natural Science Foundation of China(No.41941018)Open Research Fund of Technology Innovation Center for Geological Environment Monitoring,China(No.2020KFK1212001).
文摘Rock bolting technique is an important reinforcement measure in the geotechnical engineering practice.New rock bolts have been continuously emerging through the development of rock supporting technology.Complex conditions,such as high crustal stress,extremely soft rock,and strong mining disturbance often occur in the deep mining,resulting in large deformation of the surrounding rock masses.Since the deformation of traditional rock bolts is generally below 200 mm,failure often occurs to the rock bolts because of insufficient deformability.To effectively control the large deformation of surrounding rock masses caused by complex conditions,it is necessary to develop large deformation rock bolts with high constant resistance,also called energy-absorbing bolts.This paper systematically reviews the development of large deformation rock bolts and the structure,energy absorption mechanism,anchorage performance,and mechanical properties of several typical large deformation rock bolts.The advantages and disadvantages of existing large deformation rock bolts are compared and the concept of constant resistance large deformation support is introduced.
