纤维混凝土用于深井大硐室支护的关键技术研究

Research on Key Technology of Hybrid Fibers Concrete in Underground Chamber of Deep Mine

深井巷道支护困难是采矿界公认的,因为深部围岩在高应力作用下呈现出了工程软岩非线性大变形特点,使深井大硐室支护因支护空间大支护更加困难,对安全生产威胁非常大。针对深井大硐室支护结构高强高韧的要求,提出了将高韧性改性聚丙烯(粗)纤维与高弹模钢纤维混杂掺加到水泥基材料中形成复合水泥基材料,通过喷射在围岩表面形成支护层与锚杆、锚索形成共同支护体的施工方案。结合孔庄煤矿深部大硐室施工的实例,对施工中遇到的纤维的选择、纤维掺量的确定、喷层厚度确定等关键技术进行了论述,为该技术的推广提供技术支持。

It is publicly known that the deep mine is hard to be supported for the reason that the wallrock presents a characteristic of large nonlinear deformation under the action of high stress,and it has made great threat to safety.For the requirement of high strength toughness of deep mine roadway supporting structure,a construction plan has been present in this paper,that is adding cement-based material to high toughness polypropylene（thick） fibers and high elastic modulus of steel fiber to form a kind of composite cement-based material sprayed in the wallrock surface as the support layer,working with retaining bolt,anchor retaining structure to form a common.Based on the deep tunnel construction examples of Kongzhuang Coal Mine,researches on key technologies under construction are affirmed,such as fiber concrete proportion,fiber adulteration craft,spray craft and thickness,determination of fiber concrete secondary lining working hours,which provided a technical support for its promotion.