纤维提高水泥浆液强度及对锚杆承载性能影响的研究

Bearing capability influence and increasing cement grouting strength by fiber for anchor

对于预应力锚固工程,往水泥浆液(或砂浆)中掺入少量的玻璃纤维或聚丙烯纤维等纤维制品(掺入量为水泥质量0.07%～0.15%),可明显提高水泥浆结石体抗压强度,提高与锚孔孔壁的黏结抗剪强度,提高结石体的抗冲击韧性和抗裂能力,一般能比普通水泥浆液材提高20%以上;同时,改善锚杆受力环境和锚固段黏结应力的分布形态,增强锚固体的极限承载力,有效加强对锚杆的保护和减少预应力的损失。由于纤维砂浆的积极作用,使得锚杆的强度储备得到提高。

For the anchor solid engineering,to mix in a little quantity of fiber production such as glassfiber,polypropylene fiber to cement grout or cement sand gtout, adding fiber quantity should being controlled within 0.07%-0.15% of cement quantity,it can obviously increase the press intensity and the impact toughness and the split ability of concreting body on cement sand grout, improve shearing intensity of felting between cement sand grouting solid and anchor hole wainscot rock body, generally it can raise above 20% comparing with common cement grouting.In the meantime, it can also improve bearing circumstance and distribution modality of bond stress on anchor sect, strengthen the extreme loading of anchoring solid, reinforce safeguard to anchor, and reduce loss of prestress for anchorage bar.Because of active effect of fiber sand grout, the strength storage of anchorage bar can gain heighten.