In the daily roadway support, after a period of use of the left-handed rock bolt, due to inadequate considerations in planning, the quality of the construction is not well controlled or the construction process is not in accordance with the construction process, the application process is due to man-made or natural factors, etc. cause the original left-handed rock bolt to fail. The failed left-handed rock bolt cannot continue to provide resistance to restrain the slope deformation. At the same time, the bearing capacity of other anchors cannot be added, which will cause the left-handed rock bolt to be less resistant to sliding than the slope force.

For the reinforcement of the slope, the left-handed rock bolt must first determine the displacement and deformation of the slope before reinforcement. Here, elastic mechanics is used to solve the slope displacement, and the displacement solution of the slope under the combined effects of gravity, top load of the slope and left-handed rock bolt is given.

Nowadays, where bolt retaining wall supporting slopes are widely used, we can use the accounting methods of non-prestressed anchor reinforcement and prestressed anchor reinforcement to strengthen the stability of left-handed rock bolt. In general, when the slope stability factor and risk factor of mine left-handed rock bolts do not meet the requirements of the rules, the slope may slide or even collapse under more unfavorable factors. Reinforcement of some failed left-handed rock bolt retaining walls is particularly important. Therefore, in the process of using left-handed rock bolt, we must pay attention to these issues and use the correct method to strengthen the left-handed rock bolt.

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