本文選題：侏羅-白堊系 + 介質(zhì)結(jié)構(gòu)��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：陜北榆神礦區(qū)是榆神府侏羅紀煤田的精華部分,是我國最主要的特大型煤炭生產(chǎn)基地之一。侏羅-白堊系是我國西部富煤區(qū)的主要富煤地層,其與東部華北型煤田的石炭-二疊系存在著巨大的不同,具有獨特的含水介質(zhì)結(jié)構(gòu)與采動破壞特征,這對礦井充水條件評價影響重大。本論文以榆神礦區(qū)地質(zhì)背景為基礎(chǔ),利用實地巖樣進行X射線衍射、掃描電鏡、壓汞試驗等試驗,結(jié)合研究區(qū)域宏觀地質(zhì)沉積環(huán)境及其演化,從礦物成分、孔隙結(jié)構(gòu)、巖石力學(xué)特性方面分析了榆神礦區(qū)侏羅-白堊系結(jié)構(gòu)與微觀孔隙結(jié)構(gòu)特征;其次選取榆樹灣煤礦為原型地質(zhì)條件,通過室內(nèi)相似材料模擬和數(shù)值模擬手段,研究了特殊結(jié)構(gòu)覆巖的破壞特征和導(dǎo)水裂隙帶發(fā)育規(guī)律;然后通過分析侏羅-白堊系的展布規(guī)律和地層結(jié)構(gòu)特征,根據(jù)導(dǎo)裂帶破壞范圍和可能影響到的含水層的介質(zhì)結(jié)構(gòu)等條件,分析了侏羅-白堊系特殊的介質(zhì)結(jié)構(gòu)和采動破壞特征對礦井充水的水文地質(zhì)意義,并探討了該區(qū)煤礦保水采煤的典型工程實踐案例。本文研究的主要內(nèi)容及成果如下:(1)榆神礦區(qū)侏羅-白堊系經(jīng)歷了復(fù)雜特殊的成巖環(huán)境和短暫的沉積演化過程,利用X射線衍射、掃描電鏡和壓汞試驗分析,得出了侏羅-白堊系強度低、膠結(jié)弱、孔隙度高、滲透性好等微觀孔隙結(jié)構(gòu)特征,如直羅組巖樣孔隙度15.53%,遠高于我國東部石炭-二疊系砂巖1.1~2%的孔隙度。(2)采用相似材料模擬實驗和數(shù)值模擬手段對榆樹灣煤礦覆巖破壞特征和導(dǎo)裂帶演化規(guī)律進行了研究,模擬開采2-2煤5m上分層,覆巖變形破壞發(fā)育緩慢,最終形成跨度較大的離層空間和“平拱”形態(tài),發(fā)育高度為55m和49m,模擬值與經(jīng)驗公式計算值存在差異,顯示出了侏羅-白堊系覆巖破壞的特殊性。(3)該區(qū)侏羅-白堊系的宏觀分布規(guī)律控制了地下水的總體向東南方匯集的徑流特征,根據(jù)巖性巖相與分布特征概化為三個含水巖組,直接充水水源主要侏羅-白堊系的基巖承壓水;主要導(dǎo)水通道為頂板基巖冒落裂隙帶,其次原生結(jié)構(gòu)面裂隙等充水通道;以錦界煤礦為例,分析了典型突水礦井的充水強度因素以及裂隙閉合對充水的影響。(4)榆樹灣煤礦上分層采煤,實際導(dǎo)裂帶未破壞到潛水含水層,證實了試驗?zāi)M得出的覆巖破壞規(guī)律,為該區(qū)域類似礦井地質(zhì)條件下的保水采煤實踐積累了經(jīng)驗,為保水開采的開拓提供了思路。
[Abstract]:Yushen mining area in northern Shaanxi is the essence of Jurassic coal field of Yushenfu and one of the most important coal production bases in China.Jurassic-Cretaceous is the main coal-rich stratum in the coal-rich area of western China. It is different from the Carboniferous Permian system in the North China type coal field in the east of China, and has unique water-bearing medium structure and mining failure characteristics.This has a great impact on the evaluation of mine water filling conditions.On the basis of geological background of Yushen mining area, this paper carries out X-ray diffraction, scanning electron microscope, mercury injection test and so on by using field rock samples, combined with the study of the regional macro-geological sedimentary environment and its evolution, from the mineral composition, pore structure, and so on.The characteristics of Jurassic-Cretaceous structure and micro-pore structure in Yushen mining area are analyzed in terms of rock mechanical properties. Secondly, the Yushhuwan coal mine is selected as the prototype geological condition, and the indoor similar material simulation and numerical simulation are carried out.In this paper, the failure characteristics of overburden rock with special structure and the development law of water-conducting fissure zone are studied, and the distribution law and stratigraphic structure characteristics of Jurassic-Cretaceous system are analyzed.According to the damage range of the fracture zone and the medium structure of the aquifer, the hydrogeological significance of the special medium structure of Jurassic-Cretaceous system and the characteristics of the mining failure to the mine water filling are analyzed.The typical engineering practice case of coal mining with water conservation in this area is also discussed.The main contents and results of this paper are as follows: (1) Jurassic-Cretaceous in Yushen mine area has undergone complex and special diagenetic environment and brief sedimentary evolution process.The characteristics of micro-pore structure, such as low strength of Jurassic-Cretaceous system, weak cementation, high porosity and good permeability, are obtained.For example, the porosity of rock samples of Zhiluo formation is 15.53, which is much higher than the porosity of 1.1% of Carboniferous-Permian sandstone in the east of China. The failure characteristics of overburden rock and the evolution law of fracture guide zone in Yushhuwan Coal Mine are studied by means of similar material simulation experiment and numerical simulation.In simulated mining of 2-2 coal, the deformation and failure of overburden is slow, and the formation of "flat arch" with large span is formed. The height of development is 55m and 49m, and there is difference between the simulated value and the calculated value of empirical formula.It is shown that the characteristics of Jurassic-Cretaceous overburden failure are special.) the macroscopic distribution law of Jurassic-Cretaceous in this area controls the runoff characteristics of groundwater aggregating to the southeast. According to the lithologic lithofacies and distribution characteristics, it is generalized into three water-bearing rock formations.The water source of direct water filling is mainly Jurassic-Cretaceous bedrock confined water, the main channel is roof bedrock caving fissure zone, and the primary structure plane fissure is the other water filling channel; taking Jinjie coal mine as an example,This paper analyzes the factors of water filling intensity of typical water-inrush mine and the influence of fissure closure on water-filling. 4) the stratified coal mining in Yushhuwan coal mine is not destroyed by the actual crack guide zone, which proves the failure law of overburden rock obtained by test simulation.It has accumulated experience for the practice of water-retaining coal mining under similar geological conditions in this area, and provided some ideas for the exploitation of water-retaining mining.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD163.1

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