1、英文原文：Discrimination conditions and process of water-resistant key strataWANG Lianguo*, MIAO Xiexing, WU Yu, SUN Jian, YANG HongboState Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, ChinaAbstract: Water-preservation mining is on
2、e of the most important parts of the Green Mining technology system, which can realizethe effective regulation of groundwater resources by controlling strata movement, changing passive prevention and governanceof water disasters to active conservation and utilization of groundwater resources and thu
3、s obtaining coal and water simultaneouslyin mining. The concept of water-resistant key strata further enriches the content of the key stratum theory and provides a theoreticalbasis for water-preservation mining. In order to realize the idea of water-resistant key strata as a guideline in the design
4、of water-preservation mining and engineering applications, the conditions for discrimination in the process of water-resistant key strata,we have presented a mechanical model, as well as its corresponding computer program, based on a large number of theoretical analyses and field measurements, as we
5、ll as on a comprehensive consideration of the position, structural stability and seepage stability of key strata. Practical engineering applications indicate that this discrimination method and its corresponding computer program on water-resistant key strata are accurate and reliable and can satisfy
6、 the actual design needs of water-preservation mining and thus have instructional importance for water-preservation mining in mining areas lacking water.Keywords: water-resistant key stratum; water-preservation mining; structural stability; seepage stability1 IntroductionThe key stratum theory of st
7、rata control proposed by Qian et al. has been widely applied in the identification of suitable stratigraphic horizons of bed separation grouting, in the design of drilling hole arrangements of ground gas drainage, in the control of overlying strata and surface subsidence and elsewhere1. The key stra
8、ta in this key stratum theory of strata control are referred to as structural key strata, bearing the main effect of rock mass movements during mining, which controls the structural shape of ruptured rock masses. Given ground pressure control problems in water-preservation mining, Miao et al. have,
9、in the last few years, presented the concept of water-resistant key strata2-5. A water-resistant key stratum in water-preservation mining is difficult to define but can be described as follows: provided that the upper aquifer of a coal seam is above the structural key stratum, or the lower aquifer o
10、f a coal seam is below the structural key stratum and if the structural key stratum cannot break under mining, then the structural key stratum has a water-resistant function and is called the water-resistant key stratum. If the structural key stratum can break under mining, but the broken fissures c
11、an be filled with weak rock strata and a seepage water-inrush channel cannot be formed, then a compound water-resistant key stratum is formed by combining the structural key stratum with a weak rock stratum. From this description, one can see that the water-resistant key stratum can consist of only
12、one single rock stratum, or by compounding several layers of weak rock strata with hard rock strata. The rock strata of the water-resistant key stratum must include hard rock strata which can bear the strain of rock mass movement during mining. That is to say, a water-resistant key stratum must be f
13、ormed by structural key stratum or by compounding weak rock strata with hard rock strata that can bear a certain amount of strain of rock mass movement during mining. The concept of a water-resistant key stratum further enriches the content of the key stratum theory and provides a theoretical basis
14、for water-preservation mining. However, distinguishing water-resistant key strata largely depends on field experience and is still short of a scientific basis. In order to realize the idea of water-resistant key strata as a guideline in the design of water-preservation mining and engineering applica
15、tions, in this study, we present the conditions for discrimination and process of water-resistant key strata and their corresponding computer programs based on a large number of theoretical analyses and field measurements. In this method of discrimination, the position, structural stability and seep
16、age stability of key strata are considered comprehensively. We also provide for a corresponding force analysis model. Our practical applications suggest that the discrimination method and its corresponding computer programs of water-resistant key strata are accurate and reliable, which should satisfy the actual design needs of water-preservation mining and are thus of instructionalimportance for water-preservation mining in mining areas lacking water.2 Conditions for
