Research On Mechanical Property Of Gob-side Entry Retaining For The Top Of The Packing Body

Today rigid filling way of the packing for gob-side entry retaining for two kinds of filling patterns can cause that filling body deformation and the surrounding rock deformation can’t match; Flexible packing way is not easy to control the deformation of the filling body wall.To solve these problems, this paper presents a new type of Viscoplastic bearing of gob-side entry retaining wall technolog, this kind of wall body structure for high strength in order to provide higher support resistance,at the top of the support of viscoplastic gelation strength to supporting body sealing pressure and deformation for protection. The combination of the two kinds of packing material and become a new type of wall rock pressure coupling solved along the empty left lane adaptability and sealing problems.In this paper, first of all on the gob-side entry retaining surrounding edge motion are analyzed, the supporting early lane beside the support system to have enough cutting resistance. At the same time, the carrying capacity of the filling body in limits on, after its own will have a certain drop-off. The paper put forward the subject structure of high strength concrete early,the top using viscoplastic material viscoplastic bearing wall. Through the "superimposed plates" principle of roadside support resistance calculation, to determine the packing body requirements. Through the oretical analysis, laboratory experiments and numerical simulation method to study the top material performance of the new gob-side entry retaining wall. According to the characteristics of the top of the wall material needs, analyzed the ratio of various components of the physical and mechanical performance, the influence of ratio was optimized by using orthogonal design method. New pick top viscoplastic material is add bentonite in ordinary concrete, fly ash and additive in activity.New pick top viscoplastic material is add bentonite in ordinary concrete, fly ash and additive in activity. At the top of the packing material can keep the long time of liquidity, setting time meet engineering needs. 28 dcompressive strength of concrete can be up to 20.34 MPa, and modulus of elasticity can be reduced to 1690 MPa.Through the MIDAS / GTS software for the top packing wall and the whole wall for roadside packing supporting effect of the numerical simulation. The results show that the top packing wall has good performance; So the closed template die casting of gob-side entry retaining wall due to its early support, high strength characteristics to adapt to the roadway roof deformation, supporting significant effect, thus has the widespread application prospect.