1、英文原文Study and Practice on One New Technology of Deep Mining Soft Rock ShoringBAO Zheng-ming, KONG De-shan, WANG Jian-jun, ZHAO Jiu-liang(Liuzhuang Coal Mine, Sdic Xinji Energy Corproation Limited, Fuyang 236232,China)Abstract：According to the traditional theory of shoring, bolts and groutingwill not
2、 be done until the release of pressure of the roadway surrounding rock after three months support of soft rock tunnel. In Liuzhuang Coal Mine, the shaft satations andmainmine roadway lie in the depthof ca. 800 m. The lithologyof itsmine road-way is very soft and thus this easily results in roof fall
3、when constructing. Ifwe adoptthe traditionalwayof bo-lts and grouting, the roadwaywill expericnce tremendous and restrict sevetely the normal use of roadway. The main negative performances are shown as follows: the sinkage of the roof, the cracking of the slurry surface, the serve floor heave. the s
4、hortening of roadway section and the resulting safety hidden trouble the increasing workload and cost. To solve this problem. Liuzhuang Coal Mine adopted a newtechnology including the inte-gration of tunneling and grouting, tube bolts and anchor cable beam support through improving the support techn
5、ique on the basis of careful consideration of the stability of deep mining soft rock roadway. It has been demonstrated thatthe proposed newtechnologyof deepminingsoftrock support is feasible. The newtechnology may be exptend to other coal mines.Key words:soft rock; tunneling and grouting intergratio
6、n; tube bolts; anchor cable beam1 soft rock failure mechanism With the increase of mining depth, the stress also increased, due to rock strength is small,surrounding rock stress state meet or exceed the threshold or the plastic deformation of the rock strength limit, to reach a new balance must be d
7、eep to carry the rock Entry dynamic pressure, when a balance is destroyed, it requires a new balance to support, will surely result in increased loose circle surrounding rock, Deep and rapid deformation and thus increase roadway convergence, stability is poor, to the roadway stability control diffic
8、ult. Specifically as follows: 1 1 Deep Mine mine pressure Deep mine the root cause of poor stability, stress and pressure of large mines, or simply to stress the original great, assuming the vertical tunnel to withstand stress is equal to ground gravity, namely: 1 = HType in the H - roadway into the
9、 deep; - the average bulk density of overlying strata, 0 023 0 025 MN/m3. And assuming the level of stress: 2 = 3 = Type in the - lateral pressure coefficient. For the depth of 800 m of the tunnel, then 1 up to 20 MPa, the axial compressive strength if the roadway c = 40 MPa, there / c = 0.5, the co
10、ncentration of roadway to reach the light of uniaxial compression strength ultimate strength. Mining stress for the role by the roadway, is more prone to deformation. 1 2 Deep Mine Deformation Laws If the thickness of loose roadway express roadway deformation and damage, can be found: with the incre
11、ase of mining depth, the various rock tunnel of loose thickness with thickening; more soft rock is thicker loose circle , to withstand a variety of dynamic pressure tunnel of loose rock thickness larger. Liu Mine Lane where the level of the major rock mainly mudstone, coal and carbonaceous shale, mu
12、dstone through observation, coal and carbonaceous mudstone loose circle in the 2 m 3 m fall between deep soft rock, very difficult to support. 1 3 soft rock roadway stability control By this analysis, roadway stability depends on three aspects: (1) surrounding rock stress field, mainly by the mining
13、 depth and the mining influence decisions; (2) the mechanical properties of surrounding rock, mainly by the rock structure, rock strength and fracture development situation of the work; (3) roadway and parameters. Liu Coal Mine coal seam conditions, mining depth and Ida geological situation is irrev
14、ersible. Liu Mine from the roadway approaches and parameters to start, constantly optimize the support program, enhance the rock strength, increase support capacity to control the roadway. 2 soft rock roadways 2 1 dig, note the construction of integration Liu Mine on the Western deep soft rock shelt
15、ers were used in all 29U-type support, due to tight schedule, rock crushing, in the erection of U-shelf, often lead to local air space to help the top, leading both U-shelf Shouli Bu, When the roadway to the time pressure, U-type leg shelf shelf shelf beam and distortion will be severe, the loss of
16、their supporting capacity. Liu Mine soft rock of the loose circle in the 2 3 m room. The traditional construction process is the roadway that is to wait until 3 months after releasing the pressure surrounding rock bolting. According to this support method, Liuzhuang mine tunnel in the Western support after 3 months, most of the roadway in the deformation within 3 months of large roadway not work prop
