1、英文原文JOURNAL OF COAL SCIENCE & ENGINEERING(CHINA) ISSN 1006-9097 VOL.9 No.1 June 2003Review of roadway control in soft surrounding rock under dynamic pressureHOU Chao-jiong(School of Energy Science and Engineering, China University of Mining & Technology, Xuzhou 221008, China)Abstract The basic chara
2、cteristic of the soft rock roadway under the dynamic pressure is. At the same time, the three fundamental approaches for controlling the s analyzed urrounding rock are proposed, which are improving the surrounding rock strength, lowering the rock mass stress and selecting the reasonable supporting t
3、echnology. The research results achieved are elucidated, including the distribution of the surrounding rock plastic zone, the movement and damage of the surrounding rock under the dynamic pressure, controlling the floor heave through reinforcing the roadway wall and corner, the new route to develop
4、the roadway metal supporting technique, the key theory and technique for the bolt supporting in the coal roadway, the performance and prospect of the ZKD high-water-content quick-setting material, and so on. Finally, some personally views are put forward about the roadway metal supporting, bolt supp
5、orting, new material and the stress-relief under the high stress condition.Keywords: roadway under dynamic pressure control of rock theory of underground pressureIntroduction:There are three main factors that affected the stability of the surrounding rock, the surrounding rock strength, rock stress
6、and the supporting technique. Just because of the first 2 factors, it is more difficult to maintenance the soft rock and the dynamic pressure roadway. Corresponded to the three main factors, there are three fundamental approaches to control the roadway surrounding rock, they are: Improve the surroun
7、d rock strength. Decrease the rock mass stress. Select reasonable supporting technique.1 The achieved research results1.1 Building up new theory of underground pressure around mine roadway(1) Uneven distribution of plastic zone of roadway surrounding rock. The surrounding rock is bedded notably, and
8、 the difference between the height and strength is big. The distribution of the abutment pressure is uneven, and the supporting type is different. That makes the plastic zone distribution of the roadway surrounding rock uneven. Based on the calculation and analysis, the plastic zone distribution mod
9、e of the bedded surrounding rock is put forward as “ * type”, ”half * type”, and “ without upper (or lower) half * type” , as shown in Fig. 1.Fig. 1 The distribution modes of plastic zone around the roadway(a) Roadway in coal seam, ”* type”;(b) Roadway in the coal pillar, ”half * type”;(c) Roadway a
10、long the gob, ”half * type”;(d) Roadway in the coal pillar without direct roof or bottom,” without upper (or lower) half * type”(2) Uneven general subsidence and partial lift of the surrounding rock. Because of the large area bedded ore body extraction, the different supporting type and the influenc
11、e of the different abutment pressure, the uneven integer subsidence and part ascension of the surrounding rock is formed, as shown in Fig. 2(3) Law of roadway floor deformation and failure. Whether based on the theoretic calculation, numerical analysis or field test, the laws of the roadway floor de
12、formation can be obtained as heaving in the shallow part and sinking in the deep part, and the heave range is about less than 1.5m, as known in Fig.3.Fig. 2 Analogical material test results(3) Law of roadway floor deformation and failure. Whether based on the theoretic calculation, numerical analysi
13、s or field test, the laws of the roadway floor deformation can be obtained as heaving in the shallow part and sinking in the deep part, and the heave range is about less than 1.5m, as known in Fig.3.(4) Consolidate the roadway side and corner to control the floor heave, side deformation and separati
14、on of roof stratum slices. The surrounding rock of roadway will firstly be distorted and failed from the two bottom corners of the roadway, because of the stress concentration in the area. The subsidence of the two sides of roadway surrounding rock will induce floor heave, as shown in Fig.4. The ext
15、rusion of the horizontal stress will not only bring about the floor heave, but also induce the separation of roof stratum slices, especially the some slices out of the anchored zone. Therefore, consolidating the two sides and two bottom corners of roadway is a simple, reliable technology to control
16、the surrounding rock deformation. Bolting and grouting can be used to consolidate the roadway sides and corners.Fig .3 Displacement of 3108 air-return way floor in Quantai Coal Mine(a) Floor displacement; (b) vertical displacementFig.4 The curves of the roadway side subsidence and floor heave(a) Medium-hard surrounding rock in Dongpang Mine;(b) soft surrounding rock in Huangtangling Mine1.2
