| In recent years, with the improvement of the technology level and material culture level, thedemand of human for all kinds of underground mineral deposits is growing. The mining industryis the foundation of mineral resources exploitation and using, which provides lots of raw materialsfor human. At the same time, it easily causes negative effect, such as resources loss, surfacesubsidence, discharge waste, etc. With the rapid development of industrial society and with therapid demand of mineral, the development and utilization of mineral resources, such as metal andcoal mine, lead to surface damage, waste discharge and other bad phenomenon as well as mineenvironmental deterioration. They all causes negative effect to the earth.Fill mining method is a low dilution, high recovery mining methods，and it has been widelyused and popular attention in china. In particular, the surface does not allow destruction of themine, three spontaneous tendencies under the mining and mineral deposits in the mining process,it can keep effective control of overburden, prevent surface subsidence, keep the stability ofsurrounding rock..Among them，for the purposes of filling coal mines，fly ash cement filling mining waste rockis an important part of green mining technology in China, it is the ideal way to solve the coalmining safety and environmental problem，is a solution of coal mine "three times"（Buildings, therailway, the water body under）pressure the urgent need for coal mining problems. To this end, Thepaper through theoretical analysis, laboratory testing, field testing and numerical simulation,systematic study of the coal fly ash waste rock fill in the basic properties of cemented backfill andpractical application, received a large number of valuable results.This paper focuses on the following aspects were studied:（1）Understand the filling of the main raw material coal fly ash, coal gangue status at thisstage in China，and introduced the fly ash, coal gangue, the definition and formation. By X-raydiffraction, laser scattering particle size distribution analyzer and so on，to test analysis Caozhuang Mine used the basic properties of fly ash and coal gangue material, research andsummarize the physical and chemical properties of filling materials, Also developed a new type offilling for mine cementations material, FAC-based cementations materials. （2）By a large number of laboratory studies, Identify the impact strength of backfill curingmany factors, such as body strength and ash as fill material ratio, concentration, diffusivity, curingtime, the relationship between conservation methods and other factors, and Concentration anddiffusivity and bulk density variation and so on. Summary of these changes, solving the intensityof mine backfill some of the basic problems.（3）For site conditions of the cao zhuang mine81006,to field trials.analysis of the on-sitebackfill of the force, deformation and filling pressure ahead of the real face of changes.（4）Using FLAC software, numerical simulation of81006face area Ⅳ,analysis Ⅳ areaafter mining face, filling the floor after the stress change and destruction，In order to effectivelyprevent damage to coal mine water inrush from floor to happen.The innovation of the paper is made by a large number of laboratory tests，to solve the minebackfill some of the basic theoretical issues， by on-site detection of filling the coal face of therock pressure distribution changes，and by innovative software simulation，to analysis of the coalface after filling the bottom stress changes. Compared to the situation after the filling, accessed tosome important conclusions. Laid the foundation for the coal mines filling of China, pointed outthe direction. |
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