【摘要】：擬建普朗銅礦尾礦庫庫區(qū)地處三江并流世界自然遺產(chǎn)地邊緣,大地構(gòu)造位置隸屬三江特提斯構(gòu)造域義敦弧南部中旬弧,庫區(qū)地質(zhì)構(gòu)造復(fù)雜,可溶性巖石(碳酸鹽巖)占據(jù)庫總面積80%以上,在工程勘察過程中,重點關(guān)注了擬建項目區(qū)最突出的工程地質(zhì)問題—巖溶問題。強烈發(fā)育的巖溶對尾礦庫地基的穩(wěn)定性、未來尾礦庫滲漏,造成了潛在的安全隱患。因此,開展庫區(qū)巖溶的發(fā)育特征和規(guī)律、控制因素,尤其是地質(zhì)構(gòu)造對巖溶的控制作用及其對工程建設(shè)的影響等方面研究,是一項必不可少的而且十分重要的工作,從而為下一步進行尾礦庫建設(shè)提供可靠基礎(chǔ)地質(zhì)依據(jù)。本文在野外現(xiàn)場基礎(chǔ)地質(zhì)和水文工程地質(zhì)調(diào)查及工程勘察的基礎(chǔ)上,結(jié)合地球物理方法,研究庫區(qū)區(qū)域地質(zhì)背景、地質(zhì)構(gòu)造特征、可溶巖分布特征、巖溶發(fā)育特征及規(guī)律,系統(tǒng)深入地研究了擬建尾礦庫庫區(qū)及其周邊區(qū)域巖溶發(fā)育的主導(dǎo)控制因素—地質(zhì)構(gòu)造。采用有限元方法,利用ANSYS計算軟件,開展庫區(qū)構(gòu)造-巖溶在填筑工況下三維數(shù)值模擬分析,研究溶洞力學(xué)和變形情況,分析巖溶發(fā)育對工程建設(shè)的影響。研究表明：庫區(qū)地質(zhì)構(gòu)造類型以褶皺構(gòu)造、斷層構(gòu)造和節(jié)理構(gòu)造為主,它們控制了工程區(qū)的巖溶發(fā)育。平面上,不同類型的地質(zhì)構(gòu)造組成了呈NW-SE方向展布的平行列式構(gòu)造組合樣式；剖面上,形成了對沖式構(gòu)造組合樣式。從燕山中晚期至今,區(qū)內(nèi)構(gòu)造應(yīng)力場經(jīng)歷了NE→近SN→EW→NN W向多期構(gòu)造應(yīng)力場轉(zhuǎn)變。工程區(qū)內(nèi)巖溶類型以巖溶土洞(地表巖溶)和水平溶洞(地下巖溶)為主,在中三疊統(tǒng)尼汝組(T2n2)灰?guī)r分布區(qū),巖溶土洞在庫區(qū)沿構(gòu)造脊線、節(jié)理裂隙呈近SN-NW向三個帶狀分布,且發(fā)育集中,多呈串珠狀分布。在發(fā)育強度上,在熱絨背斜軸部、熱絨-赤昌斷層(F1)與熱絨背斜復(fù)合帶、F2和F4斷裂交叉鉗狀出口處最為強烈。水平溶洞主要沿橫張節(jié)理或縱張節(jié)理發(fā)育。采用有限元方法,利用ANSYS計算軟件進行三維數(shù)值模擬表明,水平溶洞在填筑工況下均產(chǎn)生一定變形和位移,究其原因主要是因為區(qū)內(nèi)巖溶的強烈發(fā)育,使得基巖面起伏不平,上覆土層厚薄不均,引起庫區(qū)地基不均勻沉降。在工程作用下,局部地區(qū)有發(fā)生塌陷的可能,從而引起滲漏。在工程建設(shè)或運營過程中,必須充分考慮到這一巖溶地質(zhì)災(zāi)害,采取必要防治措施。
[Abstract]:The reservoir area of the tailings of Plang Copper Mine is located at the edge of the world natural heritage site of the Sanjiang parallel flow, and the geotectonic position belongs to the middle arc of the southern part of the Yidun Arc in the Tethys tectonic domain of Sanjiang River. The geological structure of the reservoir area is complex. The soluble rock (carbonate rock) accounts for more than 80% of the total area of the reservoir. In the process of engineering investigation, the most prominent engineering geological problem in the proposed project area is karst. The stability of the tailing reservoir foundation and the leakage of the tailings reservoir are caused by the strong karst. Therefore, it is necessary and important to study the characteristics and laws of karst development in reservoir area, control factors, especially the controlling effect of geological structure on karst and its influence on engineering construction. So as to provide a reliable geological basis for the construction of tailings reservoir. On the basis of the basic geological and hydrological engineering geological survey and engineering investigation in the field, combined with geophysical methods, this paper studies the regional geological background, geological structural characteristics, soluble rock distribution characteristics, karst development characteristics and laws in the reservoir area. The geological structure is the main controlling factor of karst development in the proposed tailings reservoir area and its surrounding area. By using finite element method and ANSYS software, the three-dimensional numerical simulation analysis of tectonic-karst in reservoir area under the condition of filling is carried out, and the mechanics and deformation of karst cave are studied, and the influence of karst development on engineering construction is analyzed. The study shows that the main types of geological structures in the reservoir area are fold structure, fault structure and joint structure, which control the karst development in the engineering area. On the plane, different types of geological structures are composed of flat determinant structural assemblages distributed in the NW-SE direction, and hedge-type structural assemblages are formed in the section. From the middle and late Yanshanian to the present, the tectonic stress field in the area has undergone the transformation from NE near SN EW NN W to multi-stage tectonic stress field. The karst types in the engineering area are mainly karst soil cave (surface karst) and horizontal karst cave (underground karst). In the middle Triassic (T2n2) limestone distribution area, karst soil cave is located along the structural ridge line in the reservoir area. The joints and fissures are distributed in three bands near SN-NW, and are concentrated in development, and most of them are beaded. On the developmental strength, the cross forceps exit of F2 and F4 faults is the strongest in the composite zone of the hot cashmere back inclined axis, the hot velvet chichang fault (F1) and the hot pile anticline. Horizontal caverns are mainly developed along transverse or longitudinal joints. By using finite element method and ANSYS software, the three-dimensional numerical simulation shows that the horizontal karst caverns all produce certain deformation and displacement under the condition of filling, which is mainly due to the strong development of karst in the area, which makes the bedrock face undulating. The uneven thickness of the overlying soil caused uneven settlement of the foundation in the reservoir area. Under the action of engineering, there is the possibility of collapsing in local areas, which may cause leakage. In the process of engineering construction and operation, it is necessary to take into account this karst geological hazard and take necessary measures to prevent and cure it.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P642.25

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1 范純信;孔令廣;張單樂;陳洪年;;區(qū)域構(gòu)造應(yīng)力集中與巖溶發(fā)育程度的關(guān)系研究[A];加強地質(zhì)工作促進社會經(jīng)濟和諧發(fā)展——2007年華東六省一市地學(xué)科技論壇論文集[C];2007年

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本文編號：2405719