1、翻译部分英语原文A New Mode of Coal Mining Under Buildings with Paste-Like Backfill TechnologyCUI Jian-qiang(崔建强)，SUN Heng-hu(孙恒虎)，HUANG Yu-cheng(黄玉诚)(School of Resources and safety Engineering，CUMT，Beijing，100083，china）Abstract： The formation of the paste-like backfill technology was introduced briefly in t
2、his paper. From 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 pre
3、paration system, the pipeline transportation system, the backfill systems in fully-mechanized mining faces and the backfill process，were presented emphaticallyKey words：mining under buildings；paste-like backfill；full-sand-soil solidifying material1 IntroductionWith the rapid increase of the demand o
4、f the demand economic 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 short
5、ages，such as the poor effect of surface subsidence and deformation controlling，the serious pollution of underground operation environment and the low recovery of resourcesPaste-like backfill technology has outstanding advantages，such as the wide supply of backfill materials，the low cost of backfilli
6、ng，the easy preparation of slurry and the high strength of backfill bodyIt can control surface subsidence and deformation effectively，gain a high recovery，and does not pollute underground operation environmentUsing the new mode，harmless and non-pollution mining under buildings can be realized2 Propo
7、sal and Specificity of the New ModeIn all the modes of coal mining under buildings backfi1l mining is the most effective in the control of surface subsidence and deformation and the recovery of coa1The density of backfill body and its subsidence contraction influence the movement and deformation of
8、surface and surrounding rock directlyThe 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 stiffnessWith the development of modern
9、science and technology，the solidifying backfill mining technology has been improved and developed greatlyBased on the development trend of solidifying backfill technology，Professor SUN Heng-hu proposed a new mode referred to as paste-like solidifying backfil1The new modes specificity is that it has
10、not only the advantages of both hydraulic backfill and paste backfill，such as the good slurry fluidity and the easy pipeline gravity transportation for the formerand the great backfill body strength and the non or little dehydrating for the laterThe traditional binder cement has the poor capability
11、of fine particles solidifyingWhen 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 its backfi
12、ll body increases and the strength decreases，which leads to the loss of binder and the serious pollution of underground operation sitesWhen the density of backfill slurry is close to that of paste，its fluidity becomes poor and difficult to transportTherefore，the key to the realization of paste-like
13、backfill mode is to research and develop a new kind of binderIt is necessary for this binder to have the capability of solidifying fine particles and for its backfill body to meet the need of strengthMeanwhile，it must have a wide range of backfill materials and a lower back-fill costThe research gro
14、up leaded by Professor SUN Henghu has developed a new generation binder，full-sand-soil solidifying materia1With the new solidifying material, the paste-like backfill mode is forming gradually，which absorbs the advantages of the modern solidifying backfill and spurns its disadvantagesBased on the kno
15、wledge 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 upSo this new mode and its system design have both something similar to the solidifying backfill technology in metal mines a
16、nd its own characteristics1)Backfill material：The newly developed full-sand-soil material is adopted as binder，and debris (waste from coal mines)and fly-ash (waste from steam electric plants) are used as aggregate2)Backfill area：Coal deposits takes the shape of seams, most of which have a low angle, the area to backfill is great and backfill slurry have to be transported farther. Compared with metal deposits normally taking the shape
