某抽水蓄能电站料场边坡变形体稳定性研究

Hailian Li, Faming Zhang, Yi-feng Zhou, Y. Ding, Chang Liu
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The stress, strain and displacement under natural and rainstorm conditions are calculated and analyzed respectively, and the accuracy of the calculated results is determined by comparing with the monitoring data, so as to predict the deformation direction and rate of the deformed body. The longest movement distance of the deformed body along the shear outlet of different elevations is simulated separately to determine the affected area, which provides a reliable basis for making preventive measures for the construction site. Introduction The research on the stability of deformed slope is one of the key topics of Engineering geology, so many scholars at home and abroad have carried out in-depth studies [1-6]. The engineering geological conditions of the deformed body are complex, such as fissures, weak interbeds, faults and intersections of various structural planes distributed in the deformed body. At present, the stability evaluation of deformed body includes qualitative evaluation method, quantitative evaluation method and analysis and judgment method based on slope deformation material [8]. A deformed body is located above the slope of the material yard. The excavation at the foot of the slope has caused many tension cracks at upper part of slope and local collapse, which has a further slide tendency. Slope instability not only affects the normal operation of material yard construction, but also poses a serious threat to the safety of personnel, buildings and equipment at the foot of the slope. Therefore, it is urgent to reasonably evaluate the stability of the deformed body and accurately predict its possible degree of damage. Meanwhile, the research has far-reaching significance to ensure the smooth progress of the project construction. Taking the deformed body caused by excavation of a material yard as an example, this paper systematically evaluates the stability of the deformed body and the influence range of its failure by analyzing its deformation characteristics and utilizing the limit equilibrium theory and three-dimensional numerical simulation method, which provides a theoretical basis for the safe operation of the project. Engineering Geological Conditions Topography and Landform The deformed body area is located in the high mountain area of the Yanshan Mountains in Fengning, where the terrain is undulating and the landform belongs to the high mountain and hilly area. The slope inclines towards the southwest, with an overall slope of about 40 degrees, steep terrain and well-developed vegetation. 182 Stratigraphic Lithology The stratum is fine-grained monzonitic granite of Mesozoic Liyaozigou unit (Th). The rock is light flesh red, with few fine-grained granite texture and massive structure and the grain size is generally 1-2 mm. The surface is partly covered with landslides and sediments, generally less than 2m in thickness, mainly bedrock weathered sand, gravel and other loose structures. Geological Structure The Kangbao-Weichang deep faults along the 42°C line north of Weichang County Town are the active belt of the Inner Mongolia-Daxing'anling geosynclinal fold system. The Archaean base debris in the area are generally transformed by migmatization, and the gneiss are obscure, sporadically covered with late Jurassic-like moras construction and Late Jurassic volcanic rock formation. Earthquake The overall characteristics of neotectonic movement in the engineering area are mainly uplifted as a whole, the Quaternary fault activity is not obvious, and the modern seismic activity is weak. No historical destructive earthquakes have been recorded in the near field, and the basic intensity of the site earthquakes is 6 degrees. Failure Characteristics of Deformed Bodies On March 24, 2018, when inspecting the slope of Liyaozigou material yard, it was found that there were longitudinal penetrating cracks in the middle of the slope of Area II and horseway drainage ditch cracking at 1200m elevation. Cracks in the beams above the excavation slope (about 1340m elevation) are circular chair-shaped, the width of the tension cracks at the rear edge is about 1.5m and its falling height is about 2m. The concrete spray layer of the excavation slope at the front edge is swelling and falling off locally (Figure. 1). Figure 1. Back Edge Tension Crack and Bulging and Shedding of Concrete Shotcrete Layer. There are two faults and three groups of fissures in the deformed body. Among them, fault F1 (NE40°SE∠4°) and fault F2 (NW290°NE∠60°) are the left and right boundary of the deformed body. The two dominant structural planes (NE40°SE∠55°and NE30°SE∠35°) constitute the bottom slip surface of the deformed body. Stability Analysis of Deformation Body Physical and Mechanical Parameters of Deformed Rock Mass The recommended values of geophysical and mechanical indexes are shown in Table 1. Table 1. Values of Physical and Mechanical Parameters of Rock Mass for Stability Analysis of Deformed Bodies. Rock Mass Type Φ(°) c(kPa) Natural Density (kN/m 3 ) Saturated Density (kN/m 3 ) Poisson ratio Modulus of elasticity (×10 4 MPa) Quaternary System (Collapse, Slope Deposit) 20 20 20 21 / / Strongly Weathered Granite 27 50 24.1 24.6 0.38 0.5 Weak Weathered Granite 31 350 25.0 25.3 Micro Weathered Granite 45 1050 26.0 26.2","PeriodicalId":11324,"journal":{"name":"DEStech Transactions on Environment, Energy and Earth Sciences","volume":"31 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2019-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study on Stability of Deformation Body of Material Yard Slope of a Pumped Storage Power Station\",\"authors\":\"Hailian Li, Faming Zhang, Yi-feng Zhou, Y. 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The longest movement distance of the deformed body along the shear outlet of different elevations is simulated separately to determine the affected area, which provides a reliable basis for making preventive measures for the construction site. Introduction The research on the stability of deformed slope is one of the key topics of Engineering geology, so many scholars at home and abroad have carried out in-depth studies [1-6]. The engineering geological conditions of the deformed body are complex, such as fissures, weak interbeds, faults and intersections of various structural planes distributed in the deformed body. At present, the stability evaluation of deformed body includes qualitative evaluation method, quantitative evaluation method and analysis and judgment method based on slope deformation material [8]. A deformed body is located above the slope of the material yard. The excavation at the foot of the slope has caused many tension cracks at upper part of slope and local collapse, which has a further slide tendency. Slope instability not only affects the normal operation of material yard construction, but also poses a serious threat to the safety of personnel, buildings and equipment at the foot of the slope. Therefore, it is urgent to reasonably evaluate the stability of the deformed body and accurately predict its possible degree of damage. Meanwhile, the research has far-reaching significance to ensure the smooth progress of the project construction. Taking the deformed body caused by excavation of a material yard as an example, this paper systematically evaluates the stability of the deformed body and the influence range of its failure by analyzing its deformation characteristics and utilizing the limit equilibrium theory and three-dimensional numerical simulation method, which provides a theoretical basis for the safe operation of the project. Engineering Geological Conditions Topography and Landform The deformed body area is located in the high mountain area of the Yanshan Mountains in Fengning, where the terrain is undulating and the landform belongs to the high mountain and hilly area. The slope inclines towards the southwest, with an overall slope of about 40 degrees, steep terrain and well-developed vegetation. 182 Stratigraphic Lithology The stratum is fine-grained monzonitic granite of Mesozoic Liyaozigou unit (Th). The rock is light flesh red, with few fine-grained granite texture and massive structure and the grain size is generally 1-2 mm. The surface is partly covered with landslides and sediments, generally less than 2m in thickness, mainly bedrock weathered sand, gravel and other loose structures. Geological Structure The Kangbao-Weichang deep faults along the 42°C line north of Weichang County Town are the active belt of the Inner Mongolia-Daxing'anling geosynclinal fold system. The Archaean base debris in the area are generally transformed by migmatization, and the gneiss are obscure, sporadically covered with late Jurassic-like moras construction and Late Jurassic volcanic rock formation. Earthquake The overall characteristics of neotectonic movement in the engineering area are mainly uplifted as a whole, the Quaternary fault activity is not obvious, and the modern seismic activity is weak. No historical destructive earthquakes have been recorded in the near field, and the basic intensity of the site earthquakes is 6 degrees. Failure Characteristics of Deformed Bodies On March 24, 2018, when inspecting the slope of Liyaozigou material yard, it was found that there were longitudinal penetrating cracks in the middle of the slope of Area II and horseway drainage ditch cracking at 1200m elevation. Cracks in the beams above the excavation slope (about 1340m elevation) are circular chair-shaped, the width of the tension cracks at the rear edge is about 1.5m and its falling height is about 2m. The concrete spray layer of the excavation slope at the front edge is swelling and falling off locally (Figure. 1). Figure 1. Back Edge Tension Crack and Bulging and Shedding of Concrete Shotcrete Layer. There are two faults and three groups of fissures in the deformed body. Among them, fault F1 (NE40°SE∠4°) and fault F2 (NW290°NE∠60°) are the left and right boundary of the deformed body. The two dominant structural planes (NE40°SE∠55°and NE30°SE∠35°) constitute the bottom slip surface of the deformed body. Stability Analysis of Deformation Body Physical and Mechanical Parameters of Deformed Rock Mass The recommended values of geophysical and mechanical indexes are shown in Table 1. Table 1. Values of Physical and Mechanical Parameters of Rock Mass for Stability Analysis of Deformed Bodies. 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引用次数: 0

摘要

本文对某抽水蓄能电站花岗岩变形体的稳定性进行了研究,包括现场地质调查资料收集、构造面分布规律分析、变形体破坏模式研究和变形体稳定性预测。在此基础上,对变形体的破坏模式和稳定性进行了详细的研究。根据变形体的区域地形图,建立了二维极限平衡模型。采用3DEC离散元软件建立了三维模型。分别对自然和暴雨条件下的应力、应变和位移进行计算分析,并通过与监测数据的对比,确定计算结果的准确性,从而预测变形体的变形方向和变形速率。分别模拟变形体沿不同标高剪切出口的最长移动距离,确定受影响区域,为施工现场制定预防措施提供可靠依据。变形边坡的稳定性研究是工程地质学的重点课题之一,国内外许多学者对此进行了深入的研究[1-6]。变形体的工程地质条件复杂,在变形体中分布着裂隙、弱互层、断层和各种构造面的相交。目前,变形体稳定性评价主要有定性评价方法、定量评价方法和基于边坡变形材料的分析判断方法[8]。变形体位于物料堆场的斜坡上方。边坡底部的开挖导致边坡上部出现大量张拉裂缝和局部垮塌,并有进一步滑移的趋势。边坡失稳不仅影响物料堆场施工的正常运行,而且对边坡脚下的人员、建筑物和设备的安全构成严重威胁。因此,合理评估变形体的稳定性,准确预测变形体可能的损伤程度是当务之急。同时,对保证工程建设的顺利进行具有深远的意义。本文以某物料堆场开挖引起的变形体为例,通过分析变形体的变形特征,运用极限平衡理论和三维数值模拟方法,系统地评价了变形体的稳定性及其破坏影响范围,为工程的安全运行提供了理论依据。变形体区位于丰宁燕山高山区,地形起伏,地貌属于高山丘陵地带。坡向西南倾斜,整体坡度约40度,地形陡峭,植被发育。182地层岩性地层为中生代荔枝沟单元(Th)细粒二长花岗岩。岩石浅肉红色,少量细粒花岗岩纹理,块状结构,粒度一般为1 ~ 2mm。地表部分被滑坡和沉积物覆盖,厚度一般小于2m,主要为基岩风化砂、砾石等松散结构。渭长县城以北42°C线康保-渭长深断裂是内蒙古-大兴安岭地槽褶皱系的活动带。本区太古宙基底碎屑普遍受岩浆岩作用改造,片麻岩不明显,偶有晚侏罗世样moras构造和晚侏罗世火山岩地层覆盖。工程区内新构造运动总体特征以整体隆升为主,第四纪断裂活动不明显,现代地震活动弱。近场未见破坏性地震记录,场地地震基本烈度为6度。2018年3月24日,在对廖窑子沟料场边坡进行检查时,发现II区边坡中部出现纵向穿透性裂缝,高程1200m处出现马道排水沟裂缝。开挖边坡上方梁裂缝(标高约1340m)为圆椅形,后边缘张拉裂缝宽度约1.5m,落高约2m。开挖边坡前缘混凝土喷淋层局部膨胀脱落(图1)。混凝土喷射层后边缘张拉裂缝与胀落。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on Stability of Deformation Body of Material Yard Slope of a Pumped Storage Power Station
The stability of granite deformation body in a pumped storage power station is studied in the paper, and the research includes field geological survey data collection, analysis of distribution law of structural plane, study on failure model of deformed body and prediction of deformation body stability. Based on that, the failure modes and stability of deformed bodies are studied in detail. According to the regional topographic map of deformed body, a two-dimensional limit equilibrium model is established. The three-dimensional model is established by using 3DEC discrete element software. The stress, strain and displacement under natural and rainstorm conditions are calculated and analyzed respectively, and the accuracy of the calculated results is determined by comparing with the monitoring data, so as to predict the deformation direction and rate of the deformed body. The longest movement distance of the deformed body along the shear outlet of different elevations is simulated separately to determine the affected area, which provides a reliable basis for making preventive measures for the construction site. Introduction The research on the stability of deformed slope is one of the key topics of Engineering geology, so many scholars at home and abroad have carried out in-depth studies [1-6]. The engineering geological conditions of the deformed body are complex, such as fissures, weak interbeds, faults and intersections of various structural planes distributed in the deformed body. At present, the stability evaluation of deformed body includes qualitative evaluation method, quantitative evaluation method and analysis and judgment method based on slope deformation material [8]. A deformed body is located above the slope of the material yard. The excavation at the foot of the slope has caused many tension cracks at upper part of slope and local collapse, which has a further slide tendency. Slope instability not only affects the normal operation of material yard construction, but also poses a serious threat to the safety of personnel, buildings and equipment at the foot of the slope. Therefore, it is urgent to reasonably evaluate the stability of the deformed body and accurately predict its possible degree of damage. Meanwhile, the research has far-reaching significance to ensure the smooth progress of the project construction. Taking the deformed body caused by excavation of a material yard as an example, this paper systematically evaluates the stability of the deformed body and the influence range of its failure by analyzing its deformation characteristics and utilizing the limit equilibrium theory and three-dimensional numerical simulation method, which provides a theoretical basis for the safe operation of the project. Engineering Geological Conditions Topography and Landform The deformed body area is located in the high mountain area of the Yanshan Mountains in Fengning, where the terrain is undulating and the landform belongs to the high mountain and hilly area. The slope inclines towards the southwest, with an overall slope of about 40 degrees, steep terrain and well-developed vegetation. 182 Stratigraphic Lithology The stratum is fine-grained monzonitic granite of Mesozoic Liyaozigou unit (Th). The rock is light flesh red, with few fine-grained granite texture and massive structure and the grain size is generally 1-2 mm. The surface is partly covered with landslides and sediments, generally less than 2m in thickness, mainly bedrock weathered sand, gravel and other loose structures. Geological Structure The Kangbao-Weichang deep faults along the 42°C line north of Weichang County Town are the active belt of the Inner Mongolia-Daxing'anling geosynclinal fold system. The Archaean base debris in the area are generally transformed by migmatization, and the gneiss are obscure, sporadically covered with late Jurassic-like moras construction and Late Jurassic volcanic rock formation. Earthquake The overall characteristics of neotectonic movement in the engineering area are mainly uplifted as a whole, the Quaternary fault activity is not obvious, and the modern seismic activity is weak. No historical destructive earthquakes have been recorded in the near field, and the basic intensity of the site earthquakes is 6 degrees. Failure Characteristics of Deformed Bodies On March 24, 2018, when inspecting the slope of Liyaozigou material yard, it was found that there were longitudinal penetrating cracks in the middle of the slope of Area II and horseway drainage ditch cracking at 1200m elevation. Cracks in the beams above the excavation slope (about 1340m elevation) are circular chair-shaped, the width of the tension cracks at the rear edge is about 1.5m and its falling height is about 2m. The concrete spray layer of the excavation slope at the front edge is swelling and falling off locally (Figure. 1). Figure 1. Back Edge Tension Crack and Bulging and Shedding of Concrete Shotcrete Layer. There are two faults and three groups of fissures in the deformed body. Among them, fault F1 (NE40°SE∠4°) and fault F2 (NW290°NE∠60°) are the left and right boundary of the deformed body. The two dominant structural planes (NE40°SE∠55°and NE30°SE∠35°) constitute the bottom slip surface of the deformed body. Stability Analysis of Deformation Body Physical and Mechanical Parameters of Deformed Rock Mass The recommended values of geophysical and mechanical indexes are shown in Table 1. Table 1. Values of Physical and Mechanical Parameters of Rock Mass for Stability Analysis of Deformed Bodies. Rock Mass Type Φ(°) c(kPa) Natural Density (kN/m 3 ) Saturated Density (kN/m 3 ) Poisson ratio Modulus of elasticity (×10 4 MPa) Quaternary System (Collapse, Slope Deposit) 20 20 20 21 / / Strongly Weathered Granite 27 50 24.1 24.6 0.38 0.5 Weak Weathered Granite 31 350 25.0 25.3 Micro Weathered Granite 45 1050 26.0 26.2
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