1、翻译部分英文原文Analysis and application in controlling surrounding rock of support reinforced roadway in gob-side entry with fully mechanized miningAbstract: In order to optimize gob-side entry in fully-mechanized working face in moderate-thick-coal seams, we adopt a new attempt to pack roadside by pumping
2、 ordinary concrete, which is very important for the development of gob-side entry technology. The concrete has a long initial setting time and a low initial strength. So it is difficult to control the surrounding rock. In this paper, we analyze the effect of using roadside cable to reinforce support
3、ing in gob-side entry surrounding rock controlling based on elastic-plastic and material mechanics knowledge. And then we propose a scheme that cable is used to reinforce roadside supporting and a single hydraulic prop is used as the temporary supporting in gob side. Using the numerical simulation s
4、oftware FLAC, we numerically simulated supporting scheme. Results of both the 2D modeling and the industrial test on No.3117 face in Jingang Mine prove that the scheme is feasible. The results show that the technology of protecting the roadway in gob-side entry retained efficiently make up the defic
5、iency of roadside packing with ordinary concrete, effectively control the roof strata and acquire a good result of retaining roadway.Keywords: gob-side entry retained; surrounding rock controlling; cable reinforced roadside supporting; FLAC; single hydraulic prop; roadside support; pumping of concre
6、te 1 IntroductionNowadays, gob-side entry retaining technology is widely used in many coal mines, particularly in mines where thin and moderate-thick coal seams are exploited. With the development of fully mechanized technology, the application of gob-side entry retaining can not only increase coal
7、recovery rate, but also decrease roadway advance quantity, completely improved the tension situation of face replacement. Although the study of controlling surrounding rock in gob-side entry is practically valuable, there are some deficiencies in the course of studying and applyingfully-mechanized g
8、ob-side entry retaining:1) Roadside support system is laid more stress on, while the study of roadside reinforced support and temporary support in roadway maintenance is neglected when studying interaction roadway relationship of support surrounding rock.2) With the continuous increase of mining dep
9、th, it is more and more frequent that ground pressure comes into being in mining gateway, thus it is more difficult to control the surrounding rock. Metal props or timber support is used in gob-side entry while wood cribs, concrete blocks, high water quick setting and so on are used in roadside, whi
10、ch is a kind of single supporting way. Only when roof subsides on the support body, can its support resistance works. So the application of bolt and cable technology improves supporting ways.3) Roadway safety is the first important issue, however, good economic benefit in the course of roadway retai
11、ning also an issue to be considered. In the initial stage of roadside backfill supporting, the early stage compressive strength of concrete or high water quick setting wall cant meet the requirement, timber support, metal prop, and single prop are used as maintenance backfill in roadside close to th
12、e gob side. With the collapse and compaction of roof in gob area, these materials cant be recycled and the main tenance cost is increased.Take the problems above into account, in this paper we combine numerical simulation with theoretical analysis to prove the indispensable of cable reinforced suppo
13、rt in roadside in gob-side entry retaining in full-mechanized working face, and provide a scheme that a supplementary single hydraulic prop is reinforced. Besides that, gob-side entry retaining test was carried out and the single hydraulic props were retrieved safely in gob-side. The test result is
14、consistent with that in numerical simulation. It provides theory support and practical experience for fullymechanized gob-side entry retaining.2 Mechanical analysis of roadside reinforced support2.1Mechanical analysis of actively reinforcing surrounding rock controllingLath model from Sun Henghu and
15、 Zhao Bing 4-side rectangle plate load band segmentation is built. The location where maximum bending moment of rectangle overlay laminates and shear is as the roof load model for studying roadside support resistance on gob-side entry retaining (Fig. 1). 2Part FJCKH-F in the shadow in Fig. la is the
16、 localion of uniform load of roadside support resistance baring roof. The roof strata collapse mainly from dead weight (or dead weight and level stress), which is called active collapse, and is a main form of immediate and heaviest impact on boundary support. In this paper, roadside support resistance of roof in active collapse stage is studied. In Fig. 1b take a unit
