【摘要】：本文在礦井地質資料系統(tǒng)收集、整理和綜合分析的基礎上,結合區(qū)域構造演化分析、礦井構造特征分析、構造煤宏微觀變形特征觀測和煤體結構的測井曲線解譯,深入進行了宿東礦區(qū)構造發(fā)育特征、疊加改造規(guī)律及其對區(qū)域構造的響應特征分析,探討了礦井構造的形成演化及其動力學機制;揭示了不同煤體結構煤層發(fā)育規(guī)律及構造控制機理,取得了以下主要成果和認識。(1)探討了宿東礦區(qū)構造發(fā)育及其對區(qū)域構造演化的響應特征。宿東礦區(qū)主體構造形態(tài)受宿東向斜的控制,呈NW向延伸,褶皺及斷裂構造變形均較為強烈,褶皺構造主要為軸向NW的宿東向斜及伴生的次級褶皺;斷裂構造以NW、近NS和NE向為主,斷層性質主要為正斷層,具有落差大、延伸長的特征,但在不同的構造期具有不同性質的活動。礦井構造發(fā)育對區(qū)域構造演化的響應特征十分顯著,印支期近NS向構造擠壓作用在本區(qū)的表現(xiàn)不甚明顯;燕山早、中期NEE-SWW向擠壓作用導致徐宿弧形逆沖推覆構造的形成和演化,宿東向斜為推覆構造南段前緣逆沖巖席的主要構造之一,受徐宿推覆構造的影響十分顯著,也奠定了宿東礦區(qū)的主體構造格局;燕山晚期和喜馬拉雅期構造伸展作用不僅造成了先期斷裂性質的轉換,并使礦區(qū)構造進一步復雜化。(2)采用斷裂分形容量維法和褶皺平面變形系數(shù)法進行了礦區(qū)構造復雜程度評價。評價結果表明,主要研究對象8和10煤層斷層構造發(fā)育程度均屬于復雜型,而8煤層復雜程度更高;褶皺平面變形系數(shù)分析結果顯示,8號煤層整體變形強于10煤層。(3)通過深入的構造煤變形特征分析,將宿東礦區(qū)構造煤發(fā)育的類型分為碎裂煤、碎斑煤、碎粒煤、鱗片煤、揉皺煤和糜棱煤等。結合鉆孔測井曲線解釋將煤體結構劃分為3種組合類型,Ⅰ類煤體結構包括原生結構煤和變形程度較弱的碎裂煤,Ⅱ類煤體結構包括變形程度較強的碎裂煤、片狀煤和碎斑煤,Ⅲ類煤體結構包括碎粒煤、鱗片煤、揉皺煤和糜棱煤;深入分析8和10煤層不同類型煤體結構發(fā)育特征及其差異性。(4)探討了礦井構造對煤體變形的控制作用,認為褶皺構造、斷裂構造和層滑構造均對煤體變形和不同類型構造煤發(fā)育具有重要的控制作用,探討了8、10煤層不同類型煤體結構的分布規(guī)律。
[Abstract]:Based on the collection, arrangement and comprehensive analysis of mine geological data system, combined with the analysis of regional tectonic evolution, the analysis of mine structural characteristics, the observation of structural macro and micro deformation characteristics of coal and the interpretation of logging curves of coal body structure, The characteristics of structure development superposition and transformation and its response to regional structure in Sudong mining area are analyzed and the formation and evolution of mine structure and its dynamic mechanism are discussed. The development law and structure control mechanism of coal seam with different coal structure are revealed, and the following main achievements and understandings are obtained. (1) structural development and its response to regional tectonic evolution in Sudong mining area are discussed. The main structural shape of Sudong mining area is controlled by the Sudong syncline, which is extended in NW direction, and the deformation of fold and fault structure are both strong. The fold structure is mainly the Sudong syncline with axial NW and the secondary fold associated with it. The fault structure is dominated by NW, near NS and NE, and the fault is mainly normal fault, which has the characteristics of large gap and long extension, but it has different activities in different tectonic periods. The response of mine tectonic development to regional tectonic evolution is very significant, and the NS tectonic compression in the Indosinian period is not obvious in this area. The early and middle Yanshanian NEE-SWW compressions resulted in the formation and evolution of the Xuzhou-arc thrust nappe. The Sudong syncline is one of the main structures of the thrusts in the front margin of the southern segment of the nappe structure, which is significantly influenced by the Xu-Su nappe tectonics. It also establishes the main structure pattern of Sudong mining area. The late Yanshanian and Himalayan tectonic extensions not only resulted in the transformation of the character of the early faults, but also in the late Yanshanian and Himalayan periods. It further complicates the structure of the mining area. (2) the structural complexity of the mining area is evaluated by using the fractal capacity dimension method of fault and the fold plane deformation coefficient method. The evaluation results show that the fault structure development degree of 8 and 10 coal seam belongs to complex type, but the complex degree of 8 coal seam is higher. The analysis results of fold plane deformation coefficient show that the overall deformation of No. 8 coal seam is stronger than that of 10 coal seam. (3) through the deep analysis of tectonic coal deformation characteristics, the types of tectonic coal development in Sudong mining area are divided into cataclysmic coal, shredded coal and granular coal. Scaly coal, crumpled coal and bristle coal, etc. Combined with the interpretation of borehole logging curves, the coal body structure can be divided into three kinds of combination types. Type I coal body structure includes primary structure coal and broken coal with weak deformation degree, type II coal body structure includes fragmentation coal with strong deformation degree, flake coal and fragmentation coal. Type 鈪，

本文編號：2429362