aiming at the shortcomings of present anchor pole detector,this paper adopt advanced embedded technology,design a non—destructive anchor pole stress measuring instrument for underground coal mine,this device is characterized by highly intelligent, small size and operation simple.

Assuming that a spindle shape body is made from around rods with rods destruction, and based on upper limit of plastic limit equilibrium in soil body, the problem about stability of deep excavation slopes by anchor and determine of anchor length and anchor spacing is studied.

Attentions are paid to the problems,such as different anchor length,anchor space,shoring obliquity and surface thickness.

Combining the engineering example,the in- fluences of the design parameters,including excavation angle,anchor body diameter,horizontal inclination angle of anchor and spacing between anchors on the anchor length and internal ove.

Authors make use of JL—MG bolt integrity testing survey meter to have non—destructive test for Jingying highway bolting integrity according to stress wave principle.

The results further describe the mechanics of the impact of the hammer and rock bolt and creates the condition for the improvement of the engineering detection quality in the rock bolt nondestructive dynamic detection.