1、翻译部分英文原文A New Mode of Coal Mining Under Buildings with Paste-Like Backfill TechnologyCUI Jian-qiang ,SUN Heng-hu , HUANG Yu-cheng(School of Resources and Safety Engineering,CUMT,Beijing 100083,China)ABSTRACT:The formation of the paste-like backfill technology was introduced briefly in this paper,fro
2、m the actual cases of coal mines,a new mode of coal mining under buildings with the technology was proposed,and its specificity was analyzed,and a further introduction to the full-sand-soil solidifying material was given.The main parts of the backfill system,such as the backfill preparation system,t
3、he pipeline transportation system,the backfill systems in fully mechanized mining faces and the backfill process,were presented emphatically.KEYWORDS: mining under buildings;paste-like backfill;full-sand-soil solidifying material1 IntroductionWith the rapid increase of the demand of social and econo
4、mic development,the conflict between coal shortage and economic development is becoming more and more conspicuous.More attention has been paid on coal mining technology under buildings.The present coal mining technology under buildings can not be widely applied for its some shortages ,such as the po
5、or effect of surface subsidence and deformation cont rolling ,the serious pollution of underground operation environment and the low recovery of resources.Paste-like backfill technology has outstanding advantages,such as the wide supply of backfill materials,the low cost of backfilling,the easy prep
6、aration of slurry and the high strength of backfill body.It can control surface subsidence and deformation effectively,gain a high recovery,and does not pollute underground operation environment.Using the new mode,harmless and non-pollution mining under buildings can be realized.2 Proposal and Speci
7、ficity of the New ModeIn all the modes of coal mining under buildings backfill mining is the most effective in the control of surface subsidence and deformation and the recovery of coal.The density of backfill body and its subsidence contraction influence the movement and deformation of surface and
8、surrounding rock directly.The solidifying backfill mining technology has been widely applied in royal and nonferrous mines,for its backfill body has the following advantages such as high density,little subsidence contraction,and enough strength and stiffness.With the development of modern science an
9、d technology,the solidifying backfill mining technology has been improved and developed greatly. Based on the development trend of solidifying backfill technology,Professor SUN Heng-hu proposed a new mode referred to as paste-like solidifying backfill.The new modes specificity is that it has not onl
10、y the advantages of both hydraulic backfill and paste backfill,such as the good slurry fluidity and the easy pipeline gravity transportation for the former,and the great backfill body strength and the non-or little dehydrating for the later. The traditional binder cement has the poor capability of f
11、ine particles solidifying.When the density of backfill slurry is lower than that of paste,the slurry is easy to transport through pipelines by gravity,which will result in the loss of fine particles (including cement particles) in the dehydrating process.So the subsidence contraction of it s backfil
12、l body increases and the strength decreases,which leads to the loss of binder and the serious pollution of underground operation sites.When the density of backfill slurry is close to that of paste,it s fluidity becomes poor and difficult to transport.Therefore,the key to the realization of paste-lik
13、e backfill mode is to research and develop a new kind of binder.It is necessary for this binder to have the capability of solidifying fine particles and for it s backfill body to meet the need of strength.Meanwhile,it must have a wide range of backfill materials and a lower backfill cost.The researc
14、h group leaded by Professor SUN Heng-hu has developed a new generation binder, full-sand-soil solidifying material.With the new solidifying material, the paste-like backfill mode is forming gradually, which absorbs the advantages of the modern solidifying backfill and spurns it s disadvantages. Base
15、d on the knowledge of solidifying backfill engineering practice, the actual situation of coal mines and the paste-like backfill technology, a new mode of coal mining under buildings is set up. So this new mode and it s system design have both something similar to the solidifying backfill technology
16、in metal mines and it s own characteristics.（1）Backfill material: The newly developed full-sand-soil material is adopted as binder, and debris(waste from coal mines) and flyash (waste from steam electric plants) are used as aggregate（2）Backfill area: Coal deposit s takes the shape of seams, most of which have a low angle, so the area to backfill is great and backfill slurry have to be transported farther. Compared with metal deposits normally taking the shape
