Although it has success development different producibility bolt in last few year, concrete spraying research have not the obvious break through in anchor spray support.
虽然近几年来已成功研制了各种可伸长锚杆，但锚喷支护中混凝土喷层研究仍未有明显突破。
2
The failure forms of the anchor can generally be divided into anchorbolt or planting steel failure, parent mental concrete failure and anchorbolt of reinforcement-planting pulling failure.