What Are The Elements That Affect The Decrease Of Anchoring Force Of Mining Anchor Rods?
What are the elements that affect the decrease of anchoring force of mining anchor rods?
With the development of mine support technology, anchors and anchors are used in conjunction with each other. However, in the detailed underground use process, due to the quality of the anchoring material itself, irrational design, improper operation process, underground geological conditions and many other factors, the anchoring force will be greatly reduced. This will lead to deformation of the roadway, and even topping and roadway collapse accidents. Therefore, strengthening the anchoring force of anchor rods has become an important research topic for mine stabilization.
1. Influence elements of anchor itself
(1) Mechanical properties fail to meet the standard requirements, will reduce the anchoring force of anchor rods.
(2) The grease on the rod body on the anchoring agent impact. Resin anchoring agent is not soluble in grease, anchor rod body appearance due to the manufacturing process, by the grease pollution, reduce the bonding strength of the anchoring agent, resulting in a decline in anchor anchoring force.
2. Influence of geological conditions
The influence of water on anchoring force. Resin anchoring agent is a kind of chemical agent which is not hydrophilic and insoluble in water, its curing process is very complicated, when there is water in the borehole, in the process of mixing the resin anchoring agent, the water droplets may be dispersed to the resin cement, or perhaps in the process of curing, the water is gradually oozing out from the cement, and the curing process constitutes a lot of tiny air holes of different sizes.
3.Coal rock body temperature
Due to ventilation or geothermal reasons, the sudden rise in the temperature of the roadway or coal wall will also reduce the anchoring force of the anchor, the coal wall temperature exceeds when 45 ℃ when the anchoring force of the decline in the volatility is more significant.
4.Coal rock hardness
Different hole wall substrate directly affects the size of the anchoring force, rock hardness and anchoring agent bond strength is high, anchor anchoring force is large. If the rock is soft or the coal body is soft, or the fault broken zone anchoring agent mixing is not uniform or mixing role is poor, anchoring agent and coal rock body bond strength is poor, the anchoring role of the anchor is poor, and even the phenomenon of no anchoring force.
Coal mine underground anchor anchoring force is affected by a variety of factors, encounter anchor anchoring force decline, or anchoring force does not work, we must comprehensively analyze the reasons, find out the detailed influence of the elements, in order to anchor the anchor, coal mine support.
