發(fā)布時(shí)間：2018-04-05 21:08

  本文選題：構(gòu)造特征　切入點(diǎn)：疊加褶皺　出處：《中國礦業(yè)大學(xué)》2015年碩士論文

【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,結(jié)合區(qū)域地質(zhì)構(gòu)造背景演化和野外節(jié)理分期配套的古構(gòu)造應(yīng)力場(chǎng)分析,深刻揭示了礦井構(gòu)造發(fā)育、展布、組合特征及不同期次構(gòu)造的相互疊加與改造規(guī)律,并運(yùn)用構(gòu)造趨勢(shì)面分析定量評(píng)價(jià)了礦井構(gòu)造發(fā)育特征;通過構(gòu)造煤、構(gòu)造巖變形特征,煤鏡質(zhì)組反射率有限應(yīng)變分析等,揭示了新景煤礦的不同期次構(gòu)造發(fā)育的應(yīng)力-應(yīng)變環(huán)境、礦井構(gòu)造的演化史及其形成機(jī)制,取得以下主要研究成果和認(rèn)識(shí):(1)新景煤礦構(gòu)造變形整體較弱,以NNE~NE向的褶皺為主,多期疊加褶皺普遍發(fā)育,形成了穹狀隆起、盆形構(gòu)造和馬鞍狀構(gòu)造,控制著礦井的主要形態(tài);斷裂構(gòu)造不發(fā)育,以小斷層成群出現(xiàn)為主,3號(hào)煤層斷層走向較為分散,但以NE向和NW向?yàn)橹?15號(hào)煤層以NNE向集中發(fā)育。斷層在剖面上形成階梯狀組合以及小型地塹地壘等。(2)構(gòu)建了煤層底板等高線趨勢(shì)面數(shù)學(xué)模型,通過對(duì)3煤和15煤煤層底板等高線1-4次趨勢(shì)面及殘差圖分析,3號(hào)煤層和15號(hào)煤層整體形態(tài)較為接近,均反映了一NE高而SW低的單斜構(gòu)造,且傾角較小,很好的反映了礦井地層總體產(chǎn)狀特征。殘差圖則較為清晰的反映了褶皺發(fā)育的形態(tài),向斜為負(fù)、背斜為正,對(duì)穹窿構(gòu)造和盆形構(gòu)造顯示較為明顯,而對(duì)鞍狀構(gòu)造的指示作用不顯著,其中三次殘差圖中0線較好的顯示了礦井構(gòu)造向背斜相間、整體以NNE~NE向展布為主要特征的構(gòu)造形態(tài)。(3)研究區(qū)發(fā)育高傾角共軛剪節(jié)理系,節(jié)理走向以NEE向最為發(fā)育,其次為近EW向及NNW~NE向,反映了研究區(qū)內(nèi)多期次、不同方向的構(gòu)造應(yīng)力場(chǎng)的作用。在對(duì)節(jié)理組之間的交切關(guān)系及力學(xué)性質(zhì)觀察和分析的基礎(chǔ)上,揭示了應(yīng)力場(chǎng)特征及其演化規(guī)律。研究區(qū)煤系形成后主要經(jīng)歷了3期構(gòu)造應(yīng)力場(chǎng)作用,分別為印支期最大主應(yīng)力σ1平均方向?yàn)?°,主要形成近EW向的寬緩小型褶皺;燕山期構(gòu)造運(yùn)動(dòng)最為強(qiáng)烈,區(qū)內(nèi)最大主應(yīng)力σ1平均方向?yàn)?18°,形成礦井內(nèi)普遍發(fā)育的NNE~NE向大型寬緩褶皺、小型逆斷層及NW向小型正斷層,該期對(duì)礦井構(gòu)造格架的形成起到了關(guān)鍵性作用;喜馬拉雅期運(yùn)動(dòng)仍較為強(qiáng)烈,區(qū)內(nèi)最大主應(yīng)力σ1平均方向?yàn)?8°,形成了礦井內(nèi)NW向的寬緩褶皺及較為發(fā)育的NW~NWW向逆斷層。礦井煤層較為復(fù)雜的褶皺展布和組合形態(tài)是三期構(gòu)造應(yīng)力場(chǎng)共同作用的結(jié)果。(4)闡釋了新景煤礦構(gòu)造主要形成于中低溫-低溫的脆性變形環(huán)境,將構(gòu)造煤形成的應(yīng)力-應(yīng)變環(huán)境分為擠壓和拉張脆性碎裂變形環(huán)境、剪切脆性及脆韌性變形環(huán)境和剪切與擠壓韌性變形環(huán)境三類;煤鏡質(zhì)組反射率光性組構(gòu)較好的反映了區(qū)域上近NW~SE向的擠壓應(yīng)力作用。
[Abstract]:Based on the collection, arrangement and analysis of mine geological data system, combined with the analysis of paleotectonic stress field of regional geological tectonic background evolution and field joint stages, this paper deeply reveals the development and distribution of mine structures.The combination characteristics and the law of mutual superposition and transformation of different periods of structures are used to quantitatively evaluate the characteristics of mine structure development by using structural trend surface analysis, and through the analysis of structural coal, deformation characteristics of tectonic rocks, finite strain analysis of coal vitrinite reflectance, etc.The stress-strain environment, evolution history and formation mechanism of the structures in Xinjing coal mine are revealed. The main research results and understanding are as follows: the tectonic deformation of Xinjing coal mine is weak, mainly of NNE~NE fold.The multi-stage superimposed folds are generally developed, forming the domelike uplift, basin structure and saddle structure, which control the main shape of the mine, the fault structure is not developed, the main fault is small fault group, the strike of the No. 3 coal seam fault is scattered,However, NE and NW are dominant, and coal seam No. 15 is concentrated in NNE.A mathematical model of the isobaric trend surface of coal seam floor is established by the formation of ladder assemblage on the section of the fault and the formation of small graben barrier, etc.Based on the analysis of 1-4 trend surfaces and residual maps of the contour line of floor of No. 3 and 15 coal seams, it is found that the overall morphology of No. 3 and No. 15 coal seams is relatively close, which reflects a monocline structure with high NE and low SW, and a smaller dip angle.A good reflection of the overall occurrence of the mine strata characteristics.The residual plan clearly reflects the shape of fold development, the syncline is negative, the anticline is positive, it is obvious to the dome structure and basin structure, but not to the saddle structure.In the third residual diagram, line 0 shows well the structure of the anticline, which is characterized mainly by the distribution of NNE~NE direction.) the high dip conjugate shear joint system is developed in the study area, and the most developed joint is in the direction of NEE.Secondly, the near EW and NNW~NE directions reflect the action of tectonic stress field in different directions and multiple periods in the study area.Based on the observation and analysis of the intersecting relation and mechanical properties of joints, the characteristics of stress field and its evolution are revealed.After the formation of coal measures in the study area, the tectonic stress field was mainly experienced in three periods. The maximum principal stress 蟽 1 in Indosinian period was 4 擄in average direction, which mainly formed a wide, gentle and small fold near EW direction, and the Yanshanian tectonic movement was the strongest.The Himalayan movement is still strong, the average direction of maximum principal stress 蟽 1 in the area is 48 擄, which forms a wide and slow fold in NW direction and a relatively developed NW~NWW reverse fault in the mine.The complex fold distribution and assemblage form of coal seam is the result of the interaction of tectonic stress field in the third stage. It is explained that the structure of Xinjing coal mine is mainly formed in the brittle deformation environment of middle low temperature and low temperature.The stress-strain environment formed by tectonic coal is divided into three types: extruding and tensioning brittle fracture deformation environment, shearing brittleness and brittle ductile deformation environment and shearing and extruding ductile deformation environment.The optical fabric of the vitrinite reflects the compressive stress near the NW~SE direction in the region.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD82;TD163.1

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 ;第三屆全國礦田構(gòu)造與地質(zhì)找礦理論方法研討會(huì) 組織單位[A];第三屆全國礦田構(gòu)造與地質(zhì)找礦理論方法研討會(huì)論文集[C];2010年

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本文編號(hào)：1716457