**6. Conclusion**

1.Anchor bolts or anchor cables can provide additional cohesion increments to the surrounding rock, and the support strength reflected by the anchor shows a

certain functional relationship with the strength-stress ratio and plant span. Through the statistical method of least squares fitting, four empirical formulas are proposed for the strength-stress ratio *Kσ* of anchor bolts and anchor cables and the plant span *B*.


*New Approaches in Foundation Engineering*
