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华北型岩溶煤田系指主采煤层主要受中奥陶统灰岩水害威胁的石炭二叠系煤矿区。石炭系灰岩为薄层灰岩,对煤层开采有影响的灰岩主要是太原统底部单层厚度超过4米的灰岩层。中奥陶统灰岩岩溶水对煤矿安全威胁最大。中奥陶统灰岩垂直方向上的岩性差异变化较大,按岩性特征可分为三组六段,每组底部段岩溶发育弱、富水性差,上部段岩溶发育和富水性均强。岩溶形态有溶蚀裂隙、溶洞、蜂窝状溶孔、陷落柱等,以溶蚀裂隙为主。对煤层开采有影响的主要是溶蚀裂隙,但焦作、淄博以南也要考虑地下溶洞。岩溶水类型主要是裂隙岩溶水。底板灰岩水突出主要与断裂构造有关。
The North China-type karst coalfield refers to the Permian Carboniferous coalfield in which the main coal seam is mainly threatened by the water hazards of the Middle Ordovician limestone. Carboniferous limestone is a thin layer of limestone. The limestone that affects the coal seam mining is mainly limestone with a single layer thickness of over 4 meters at the bottom of the Taiyuan system. Middle Ordovician limestone karst water has the greatest threat to coal mine safety. The lithological differences in the vertical direction of the Middle Ordovician limestone vary greatly. According to the lithological characteristics, they can be divided into three groups of six sections. The karst development in each bottom section of each block is weak and its water-richness is poor. Both upper karstification development and water-richness are strong . There are karst fractures karst cave, cave, honeycomb dissolved pores, such as the collapse of the column to crack the main dissolution. Affecting the coal seam mining is mainly the dissolution of cracks, but Jiaozuo, south of Zibo have to consider underground karst. Karst water type is mainly fractured karst water. Bottom limestone water is mainly related to the fault structure.