【摘要】：本文在礦井地質(zhì)資料系統(tǒng)收集、整理和分析的基礎(chǔ)上,深入分析祁南礦構(gòu)造特征及其發(fā)育規(guī)律,采用分形分維的方法定量評(píng)價(jià)了72號(hào)和10號(hào)煤層斷裂構(gòu)造的復(fù)雜程度;通過井下煤壁觀測(cè)及構(gòu)造煤樣品變形特征分析及測(cè)井解譯,分析了構(gòu)造煤宏、微觀變形特征及不同煤體結(jié)構(gòu)煤層的發(fā)育規(guī)律,探討了主控地質(zhì)因素對(duì)構(gòu)造煤發(fā)育及分布的控制作用,取得了以下主要成果和認(rèn)識(shí)。(1)祁南煤礦位于宿南箱狀向斜轉(zhuǎn)折端的SW部,主要經(jīng)歷了印支期NS向擠壓、燕山期NWW-SEE向的擠壓以及喜馬拉雅期NW-SE向的伸展應(yīng)力三期構(gòu)造應(yīng)力作用,其中燕山期徐宿逆沖推覆構(gòu)造的形成與演化對(duì)井田主體構(gòu)造格局具有極為重要的控制作用,奠定了研究區(qū)主體構(gòu)造格局,導(dǎo)致宿南向斜及轉(zhuǎn)折端多方向斷層的形成。礦區(qū)內(nèi)主要發(fā)育了張學(xué)屋向斜和王樓背斜兩條褶皺構(gòu)造,斷裂構(gòu)造在礦井中發(fā)育廣泛,主要有NE、近NS、NNE及NW向四組,其中以NS、NE向斷層較多,而NNE向斷層多為落差、延展長(zhǎng)度較大的斷層,并以正斷層為主。礦井中部和東部斷裂構(gòu)造十分發(fā)育,而北部和南部相對(duì)發(fā)育程度較低。斷層發(fā)育復(fù)雜程度分形容量維定量評(píng)價(jià)結(jié)果表明,72號(hào)和10號(hào)煤層的斷裂構(gòu)造復(fù)雜程度都較高,但呈現(xiàn)不均一性,北部和南部地區(qū)分維值較小,而在中部,西部和東部的分維值較大。(2)通過構(gòu)造煤宏、微觀變形特征分析,礦井以發(fā)育脆性變形系列構(gòu)造煤為主,主要有碎裂煤和碎斑煤,脆韌性過渡系列的鱗片煤和韌性系列的揉皺煤也有所發(fā)育。依據(jù)前人分類標(biāo)準(zhǔn),結(jié)合祁南礦特征將測(cè)井曲線判識(shí)的煤體結(jié)構(gòu)劃分為3類,Ⅰ類煤體結(jié)構(gòu)為原生結(jié)構(gòu)煤,Ⅱ類為弱變形構(gòu)造煤,主要為碎裂煤和碎斑煤,Ⅲ類為強(qiáng)變形構(gòu)造煤,為變形強(qiáng)度高于碎斑煤的脆性、脆韌性過渡和韌性變形系列的構(gòu)造煤。運(yùn)用本文提出的“三分組,橫縱對(duì)比”的方法進(jìn)行判識(shí),結(jié)果顯示,72號(hào)煤層以Ⅱ類和Ⅲ類煤煤體結(jié)構(gòu)為主,而10號(hào)煤層則以Ⅰ類和Ⅱ類煤體結(jié)構(gòu)發(fā)育為主。(3)探討了祁南礦72和10煤層的Ⅱ類和Ⅲ類煤體結(jié)構(gòu)分布及厚度變化規(guī)律,深入分析了褶皺構(gòu)造、斷裂構(gòu)造對(duì)煤體變形的影響,認(rèn)為區(qū)域的宿南向斜及次級(jí)褶皺對(duì)煤體結(jié)構(gòu)類型分布起到了主要的控制作用,斷裂構(gòu)造的影響相對(duì)較弱,但在斷層密集或大斷層發(fā)育區(qū)以及與褶皺的構(gòu)造疊加區(qū)煤體變形也較為強(qiáng)烈,可形成Ⅲ類煤體結(jié)構(gòu)。
[Abstract]:Based on the collection, collation and analysis of mine geological data system, this paper deeply analyzes the structural characteristics and development rules of Qinan Coal Mine, and quantitatively evaluates the complexity of fracture structures of No. 72 and No. 10 coal seams by means of fractal dimension method. Based on the observation of underground coal wall and the analysis and interpretation of deformation characteristics of structural coal samples, the macro and micro deformation characteristics of structural coal and the development law of coal seams with different coal bodies are analyzed. This paper discusses the controlling effect of main controlling geological factors on the development and distribution of tectonic coal, and obtains the following main achievements and understandings. (1) Qining Coal Mine, located at the turning end of Sunan box syncline, mainly experienced NS compression during the Indosinian period. The compression of NWW-SEE direction in Yanshanian period and the third stage of extensional stress in NW-SE direction of Himalayas, in which the formation and evolution of Xushu thrust nappe structure in Yanshanian period play an extremely important role in controlling the tectonic pattern of the main body of the mine field. The main tectonic pattern of the study area was established, resulting in the formation of multi-directional faults in Sunan syncline and turning zone. There are mainly two fold structures in the mining area, Zhangxuewu syncline and Wanglou anticline, and the fault structures are widely developed in the mine. There are mainly four groups of NE, near NS,NNE and NW, in which the NS,NE trending faults are more, and the NNE trending faults are mostly drop faults. The fault with large extension length is dominated by normal fault. The fault structures in the middle and east of the mine are well developed, but the relative development degree in the north and south is relatively low. The quantitative evaluation results of fractal capacity dimension of fault development complexity show that the fracture structure complexity of No. 72 and No. 10 coal seams are both relatively high, but show heterogeneity, and the fractal dimension values in northern and southern regions are smaller, but in the middle, The fractal dimension of the west and the east is larger. (2) through the analysis of the macro and microscopic deformation characteristics of the tectonic coal, the coal mine is dominated by the development of brittle deformation series of structural coal, which mainly consists of broken coal and maculate coal. Brittle-ductile transition series of scale coal and toughness series of crumpled coal also developed. According to the former classification standard and combining with the characteristics of Qinan Mine, the coal body structure identified by logging curve can be divided into three categories. The coal body structure of type I is primary structure coal, and type II is weakly deformed structural coal, which mainly consists of fragmentation coal and fragmentation coal. Type 鈪，

本文編號(hào)：2341474