龍門山北段飛鳳山地區(qū)構(gòu)造變形特征及對場地穩(wěn)定性的影響
發(fā)布時間：2018-08-06 12:19
【摘要】：近幾年龍門山地震頻發(fā),特別是2008年汶川地震,由于地震強(qiáng)度大,震源淺,烈度大,影響范圍波及大半個中國,導(dǎo)致在超過10萬km2的范圍內(nèi)產(chǎn)生了重大的人員和財產(chǎn)損失,這是新中國成立以來破壞性最強(qiáng)、波及范圍最大的一次地震。對龍門山斷裂帶區(qū)域地質(zhì)及地質(zhì)穩(wěn)定性產(chǎn)生了重要影響。而飛鳳山地區(qū)正處于龍門山斷裂帶北段,是揚(yáng)子板塊、松潘地塊和祁連—秦嶺造山帶系的交界處。從北西到南東可劃分為龍門山中央推覆帶、龍門山前陸推覆帶和四川盆地三個Ⅲ級構(gòu)造單元。受多個地質(zhì)單元構(gòu)造活動影響,研究區(qū)處于活動區(qū)域的邊緣,多期次多階段受到不同方向力的作用,使得研究區(qū)的構(gòu)造較為復(fù)雜。針對場地地質(zhì)穩(wěn)定性問題,本研究課題將為場地穩(wěn)定性評價和加固提供技術(shù)支撐,對保證場地安全具有重要意義;同時部分理論研究上的突破,對同類工程的處置具有重要參考和指導(dǎo)意義。在運(yùn)用構(gòu)造地質(zhì)學(xué)的技術(shù)方法,宏觀掌握飛鳳山地區(qū)以及鄰近區(qū)域的研究進(jìn)展和成果上,通過野外地質(zhì)調(diào)查和分析該地區(qū)有關(guān)的地層、構(gòu)造以及測年數(shù)據(jù)等方面的研究成果,對該地區(qū)構(gòu)造的幾何學(xué)特征、運(yùn)動學(xué)特征、構(gòu)造組合特征進(jìn)行詳細(xì)的研究,對地區(qū)構(gòu)造的動力學(xué)機(jī)制有一個初步的認(rèn)識,進(jìn)而對該地區(qū)的構(gòu)造演化史進(jìn)行研究。通過對飛鳳山地區(qū)的野外實(shí)際地質(zhì)調(diào)查工作,以及室內(nèi)構(gòu)造數(shù)據(jù)的整理分析,明確了飛鳳山地區(qū)的構(gòu)造單元特征以及應(yīng)力演化序列,飛鳳山地區(qū)在構(gòu)造輪廓形成之后,還經(jīng)歷了多期應(yīng)力,逐漸形成了現(xiàn)在的構(gòu)造形態(tài)。在系統(tǒng)總結(jié)前人研究成果的基礎(chǔ)上,通過野外地質(zhì)調(diào)查和室內(nèi)資料的整理分析,對于飛鳳山地區(qū)構(gòu)造特征及其演化得出了如下認(rèn)識:第一期為平面X節(jié)理及褶皺形成,來自NW-SE應(yīng)力;第二期為斷層走滑性質(zhì),受N-S方向主應(yīng)力;第三期褶皺及逆沖斷層形成,受NE-SW應(yīng)力;第四期節(jié)理密集帶形成,早期逆沖性質(zhì),受E-W向主應(yīng)力;第五期為拉張應(yīng)力,主要表現(xiàn)N-S向X節(jié)理有正斷性質(zhì);第六期小斷層走滑性質(zhì),受NW-SE主應(yīng)力。從工程地質(zhì)分析的實(shí)際需要出發(fā),認(rèn)為其中對場地影響較大的主要有下列幾組:一、近W-E向陡傾斷層及節(jié)理密集帶近W-E向陡傾斷層絕大多數(shù)為構(gòu)造角礫巖帶,角礫巖固結(jié)堅(jiān)硬,焊接兩盤。少數(shù)含斷層泥者從上述測年數(shù)據(jù)看無晚更新世以來的活動。節(jié)理密集帶充填兩期方解石脈,無第四紀(jì)活動跡象。二、近N-S向節(jié)理密集帶宏觀觀察場地近N-S向節(jié)理密集帶為脆-韌性變形產(chǎn)物:帶內(nèi)兩條節(jié)理間為復(fù)雜的揉皺構(gòu)造,節(jié)理面上留下擦痕及方解石拉伸線理。場地外回灘子的小斷層的晚更新世活動釋放了場地內(nèi)同方向構(gòu)造的構(gòu)造應(yīng)力�；貫┳拥耐砀率阑顒右�?yàn)槌霈F(xiàn)在泥巖中,判斷其為蠕滑活動而非粘滑活動,因此對場地穩(wěn)定性影響不大。三、順層錯動帶或泥化夾層帶順層錯動帶或泥化夾層帶有一定的活動性,活動點(diǎn)分布零星。表明晚更新世以來順層滑動出現(xiàn)過,但未出現(xiàn)貫穿性大規(guī)模活動。
[Abstract]:In recent years, Longmen Mountain earthquake occurred frequently, especially in the Wenchuan earthquake of 2008. Due to the large earthquake intensity, shallow seismic source and high intensity, the impact range has been affected by more than half of China, resulting in great loss of personnel and property in the range of more than 100 thousand Km2. This is the most devastating and most widespread earthquake in Longmen since the founding of new China. The mountain fault zone has an important influence on the regional geology and geological stability, while the Fengshan area is located in the northern part of the Longmen Mountain Fault Zone, which is the junction of the Yangzi plate, the Songpan block and the Qilian Qinling Mountains orogenic belt system. From the North West to the South East, it can be divided into the central nappe zone of the Longmen mountain, the cladding belt of the Longmen in front of the mountain and the three third grade structures in the Sichuan basin. Affected by the tectonic activities of multiple geological units, the research area is on the edge of the active area, and the multi phase and multi stage is affected by different direction forces, which makes the structure of the research area more complex. In view of the problem of site geological stability, this research project will provide technical support for the evaluation and reinforcement of site stability and guarantee site safety. It is of great significance; at the same time, the breakthrough in some theoretical research has important reference and guiding significance for the disposal of similar projects. In the use of the technical methods of tectonic geology, the research progress and results of the Fengshan area and adjacent areas are mastered, and the related strata, structures and measurements in the area are investigated and analyzed by field geological investigation and analysis. The research results of the annual data, such as the geometric features of the region, the kinematic characteristics and the structural combination features, have a detailed understanding of the dynamic mechanism of the regional tectonics, and then study the tectonic evolution history of the region, and through the field investigation of the field in the Fengshan area, and According to the analysis of the indoor structural data, the characteristics of the tectonic units and the sequence of stress evolution in the Fengshan area have been clarified. After the formation of the tectonic outline, the Fengshan region has also experienced multiple periods of stress and gradually formed the present structural form. On the basis of the systematic summary of the previous research results, the field geological survey and the indoor data are carried out. The analysis shows the following understanding of the structural characteristics and evolution of the Fengshan area: the first phase is plane X joints and folds, from NW-SE stress, the second phase is fault strike slip, the main stress in N-S direction, the third fold and thrusting faults, the NE-SW stress, the fourth stage dense zone, and the early thrusting properties, E- W is the main stress; the fifth stage is tensile stress, which mainly shows that N-S has a positive fault to X joints, and the sixth small fault strike slip property is subject to the main stress of the engineering geological analysis. In most of the tectonic breccia belts, breccia is consolidated and hard, and two plates are welded. A few of the gouges have no late Pleistocene activities from the above data. The two phase of the calcite veins filled with the jointed zone have no signs of Quaternary activity. Two, near N-S to the macroscopic observation site near the joint dense zone is brittle ductile deformation. The two joints in the belt are complex crumpled structures, and the joints leave scratches and calcite stretching lines. The late Pleistocene activities of the small faults in the back of the field released the tectonic stress in the same direction in the site. The late Pleistocene activity of the back beach was judged to be a creep rather than a stick slip activity in the mudstone. Therefore, there is little effect on the stability of the site. Three, the bedding dislocation belt or the muddy interlayer with a bedding dislocation or muddy interlayer has a certain activity, and the distribution of the active point is scattered. It shows that the bedding slip has appeared since the late Pleistocene, but there is no penetrating large-scale activity.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P315.2
本文編號：2167711
[Abstract]:In recent years, Longmen Mountain earthquake occurred frequently, especially in the Wenchuan earthquake of 2008. Due to the large earthquake intensity, shallow seismic source and high intensity, the impact range has been affected by more than half of China, resulting in great loss of personnel and property in the range of more than 100 thousand Km2. This is the most devastating and most widespread earthquake in Longmen since the founding of new China. The mountain fault zone has an important influence on the regional geology and geological stability, while the Fengshan area is located in the northern part of the Longmen Mountain Fault Zone, which is the junction of the Yangzi plate, the Songpan block and the Qilian Qinling Mountains orogenic belt system. From the North West to the South East, it can be divided into the central nappe zone of the Longmen mountain, the cladding belt of the Longmen in front of the mountain and the three third grade structures in the Sichuan basin. Affected by the tectonic activities of multiple geological units, the research area is on the edge of the active area, and the multi phase and multi stage is affected by different direction forces, which makes the structure of the research area more complex. In view of the problem of site geological stability, this research project will provide technical support for the evaluation and reinforcement of site stability and guarantee site safety. It is of great significance; at the same time, the breakthrough in some theoretical research has important reference and guiding significance for the disposal of similar projects. In the use of the technical methods of tectonic geology, the research progress and results of the Fengshan area and adjacent areas are mastered, and the related strata, structures and measurements in the area are investigated and analyzed by field geological investigation and analysis. The research results of the annual data, such as the geometric features of the region, the kinematic characteristics and the structural combination features, have a detailed understanding of the dynamic mechanism of the regional tectonics, and then study the tectonic evolution history of the region, and through the field investigation of the field in the Fengshan area, and According to the analysis of the indoor structural data, the characteristics of the tectonic units and the sequence of stress evolution in the Fengshan area have been clarified. After the formation of the tectonic outline, the Fengshan region has also experienced multiple periods of stress and gradually formed the present structural form. On the basis of the systematic summary of the previous research results, the field geological survey and the indoor data are carried out. The analysis shows the following understanding of the structural characteristics and evolution of the Fengshan area: the first phase is plane X joints and folds, from NW-SE stress, the second phase is fault strike slip, the main stress in N-S direction, the third fold and thrusting faults, the NE-SW stress, the fourth stage dense zone, and the early thrusting properties, E- W is the main stress; the fifth stage is tensile stress, which mainly shows that N-S has a positive fault to X joints, and the sixth small fault strike slip property is subject to the main stress of the engineering geological analysis. In most of the tectonic breccia belts, breccia is consolidated and hard, and two plates are welded. A few of the gouges have no late Pleistocene activities from the above data. The two phase of the calcite veins filled with the jointed zone have no signs of Quaternary activity. Two, near N-S to the macroscopic observation site near the joint dense zone is brittle ductile deformation. The two joints in the belt are complex crumpled structures, and the joints leave scratches and calcite stretching lines. The late Pleistocene activities of the small faults in the back of the field released the tectonic stress in the same direction in the site. The late Pleistocene activity of the back beach was judged to be a creep rather than a stick slip activity in the mudstone. Therefore, there is little effect on the stability of the site. Three, the bedding dislocation belt or the muddy interlayer with a bedding dislocation or muddy interlayer has a certain activity, and the distribution of the active point is scattered. It shows that the bedding slip has appeared since the late Pleistocene, but there is no penetrating large-scale activity.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P315.2
【參考文獻(xiàn)】
相關(guān)期刊論文 前2條
1 馬杏垣;;中國巖石圈動力學(xué)概要[J];地質(zhì)學(xué)報;1987年02期
2 周建文,曾慶,徐世琦,李毅,洪海濤,宋明偉,胡恒智,何智慧;龍門山北段推覆構(gòu)造帶變形特征研究[J];天然氣工業(yè);2005年S1期
，本文編號：2167711
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