差异风化型危岩力学模型及破坏机制研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
差异风化型危岩多形成于由砂岩和泥岩等软、硬岩性组成的互层陡倾岩质边坡中,其崩塌破坏属地质灾害中的常见形态。以普洱渡危岩高边坡为例,推导出差异风化型危岩岩腔后壁泥岩压应力随岩腔深度增加而增大的计算公式。据普洱渡危岩高边坡地形地貌和地质构造特征建立了两类4种差异风化型危岩力学模型:第1类为主控结构面贯通率等于1时的泥岩基座压裂破坏型和转动破坏型危岩;第2类为主控结构面贯通率小于1时的坠落型和倾倒型危岩。利用岩石强度理论推导出研究区砂岩的二次抛物线型摩尔强度包络方程,以极限平衡理论和摩尔强度理论推导了4种危岩体在自重、地震力和裂隙水压力共同作用下的崩塌破坏判别表达式,并由此反演出危岩体的临界崩塌边界方程,得出危岩体崩塌边界(岩腔深度、危岩体厚度和高度、主控裂隙深度)之间的关系,为现场预测和判别危岩体的稳定性和崩落时序提供简便可靠的依据。
Differential weathering can cause unstable rock mass in rock slope with alternating strata. The alternating strata can be sandstone and mudstone and belong to the soft and hard rocks. The rock collapse damage is a common form of geological disasters. This paper uses unstable rock mass at Puerdu as case study. The calculation formula for the compressive stress of unstable hard rock block on the soft mudstone base is derived for the slope rock mass with cavity in the soft mudstone due to differential weathering. The stress increases as the cavity depth increase. According to the slope topography, geomorphology and characteristics of geological structure of unstable rock blocks at Puerdu, two kinds of four unstable rock mechanical models due to differential weathering are established. The first type is the type of mudstone base fracturing damage and rotational damage unstable rock block whose main control fissure connectivity rate is equal to 1. The second type is the type of falling and toppling of unstable rock block whose main control fissure connectivity rate is less than 1. The rock strength theory is used to derive the quadratic parabolic Mohr strength envelope equation for sandstone at the study area. The limit equilibrium theory and Mohr strength theory is used to deduce the collapsing damage and judgment expression of four kinds of unstable rock blocks under the gravity, earthquake force and fissure water pressure. The critical collapse boundary equation is derived for the unstable rock mass at the study area. The relationships among rock cavity depth, thickness, height and the main control fissure depth are also derived. Those results provide an intuitive and reliable basis for the prediction and judgment of stability and collapse of the unstable rock mass.
引文
[1]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.
    [2]陈洪凯,唐红梅,叶四桥.危岩防治原理[M].北京:地震出版社,2006.
    [3]陈洪凯,王蓉,唐红梅.危岩研究现状及趋势综述[J].重庆交通学院学报,2003,22(3):18-22.CHEN Hong-kai,WANG Rong,TANG Hong-mei.Review on current situation to study and trend of dangerous rock mass[J].Journal of Chongqing Jiaotong University,2003,22(3):18-22.
    [4]叶四桥,陈洪凯,唐红梅.重庆市万州区太白岩危岩综合治理[J].重庆交通学院学报,2004,23(1):85-89.YE Si-qiao,CHEN Hong-kai,TANG Hong-mei.Synthetic treatment of Taibaiyan daugerous rock in Wanzhou district of Chongqing[J].Journal of Chongqing Jiaotong University,2004,23(1):85-89.
    [5]陈洪凯,鲜学福,唐红梅,等.三峡库区危岩群发性机理与防治—以万州太白岩为例[J].重庆大学学报,2008,31(10):1178-1184.CHEN Hong-kai,XIAN Xue-fu,TANG Hong-mei,et al.A massive development mechanism and countermeasures for perilous rocks in the Three Gorges Reservoir area of P.R.China:The example of the Taibaiyan cliff at Wanzhou[J].Journal of Chongqing University,2008,31(10):1178-1184.
    [6]李明,陈洪凯,叶四桥.重庆市洪崖洞危岩发育机理[J].中国地质灾害与防治学报,2008,19(2):1-6.LI Ming,CHEN Hong-kai,YE Si-qiao.Failure mechanism of Hongyadong dangerous rockmass,Chongqing city[J].The Chinese Journal of Geological Hazard and Control,2008,19(2):1-6.
    [7]张树军,周志东.重庆武隆鸡尾山山体滑塌特征及思索[J].四川水力发电,2010,29(增刊1):145-147.ZHANG Shu-jun,ZHOU Zhi-dong.The caracteristics of landslide in Chongqing Wulong Jiwei Mountain[J].Sichuan Water Power,2010,29(Supp.1):145-147.
    [8]陈洪凯,鲜学福,唐红梅.石质山区崩塌灾害形成机制—以四面山国家级风景名胜区红岩山为例[J].四川大学学报(工程科学版),2010,42(3):1-6.CHEN Hong-kai,XIAN Xue-fu,TANG Hong-mei.Developing mechanism for collapse disaster in rocky mountain area—taking Mt.Hongyan in the national scenic spots of simianshan as an example[J].Journal of Sichuan University(Engineering Science Edition),2010,42(3):1-6.
    [9]张永兴,卢黎,张四平,等.差异风化型危岩形成和破坏机理[J].土木建筑与环境工程,2010,32(2):1-6.ZHANG Yong-xing,LU Li,ZHANG Si-ping,et al.Development and failure principle of differential weathering overhanging rock[J].Journal of Civil,Architectural&Environmental Engineering,2010,32(2):1-6.
    [10]唐红梅,叶四桥,陈洪凯.危岩主控结构面损伤-断裂数值模拟[J].重庆交通学院学报,2005,24(4):84-87.TANG Hong-mei,YE Si-qiao,CHEN Hong-kai.Research on numerical simulation of damage-firacture process of control fissure in unstable rock[J].Journal of Chongqing Jiaotong University,2005,24(4):84-87.
    [11]CHEN HONGKAI,TANG HONGMEI.Method to calculate fatigue fracture life of control fissure in perilous rock[J].Applied Mathematics and Mechanic,2007,28(5):643-649.
    [12]CHEN HONGKAI,TANG HONGMEI,ZHU HUI.Research on duration for perilous rock to form[J].WSEAS Transactions on Applied and Theoretical Mechanic,2006,1(2):169-173.
    [13]蒋良潍,黄润秋.反倾层状岩体斜坡弯曲-拉裂两种失稳破坏之判据探讨[J].工程地质学报,2006,14(3):289-294.JIANG Liang-wei,HUANG Run-qiu.Bending yielding and tensile cracking criteria for failure of rock slope whose dip direction opposite to the dip direction of strata[J].Journal of Engineering Geology,2006,14(3):289-294.
    [14]左保成,陈从新,刘小巍,等.反倾岩质边坡破坏机理模型试验研究[J].岩石力学与工程学报,2005,24(19):3505-3511.ZUO Bao-cheng,CHEN Cong-xin,LIU Xiao-wei,et al.Modeling experiment study on failure mechanism of counter-tilt rock slope[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(19):3505-3511.
    [15]王根龙,伍法权,祁生文.悬臂-拉裂式崩塌破坏机制研究[J].岩土力学,2012,33(增刊2):269-274.WANG Gen-long,WU Fa-quan,QI Sheng-wen.Research on failure mechanisms for cantilever and tension cracktype collapse[J].Rock and Soil Mechanics,2012,33(Supp.2):269-274.
    [16]胡厚田.崩塌落石研究[J].铁道工程学报,2005,22(增刊):387-391.HU Hou-tian.Research on the collapse and falling stone[J].Journal of Railway Engineering Society,2005,22(Supp.):387-391.
    [17]MICHALOWSKI R L.Slope stability analysis:A kinematical approach[J].Geotechnique,1995,45(2):283-293.
    [18]陈佳,彭社琴,刘根亮.基于极限分析上限法的危岩体崩塌稳定性分析[J].河南理工大学学报(自然科学版),2009,28(2):180-184.CHEN Jia,PENG She-qin,LIU Gen-liang.Stability analysis of unstable rock collapsing based on limit analysis upper bound method[J].Journal of Henan Polytechnic University(Natural Science),2009,28(2):180-184.
    [19]陈洪凯,唐红梅,王蓉.三峡库区危岩稳定性计算方法及应用[J].岩石力学与工程学报,2004,23(4):614-619.CHEN Hong-kai,TANG Hong-mei,WANG Rong.Calculation method of stability for unstable rock and application to the Three Gorges reservoir[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):614-619.
    [20]姜克春.缓倾角层状岩体边坡破坏规律的力学机理研究[D].重庆:重庆交通大学,2008.
    [21]胡杰刚,俞敏,全洪波,等.贵柳高速公路边坡岩石风化速度的研究[J].水文地质工程地质,2003,(4):67-71.HU Jie-gang,YU Min,QUAN Hong-bo,et al.Weathering velocity of slope rock in Guilin-Liuzhou expressway[J].Hydrogeology&Engineering Geology,2003,(4):67-71.
    [22]王林峰,陈洪凯.危岩链式规律的力学演绎[J].重庆建筑大学学报,2008,30(2):94-97.WANG Lin-feng,CHEN Hong-kai.Mechanical illation for chained regularity of perilous rock[J].Journal of Chongqing Jianzhu University,2008,30(2):94-97.
    [23]陈洪凯,王全才,唐红梅.岩腔内泥岩压裂风化特性研究[J].人民长江,2010,41(21):51-54.CHEN Hong-kai,WANG Quan-cai,TANG Hong-mei.Study on weathering and fracturing features of mudstone in rock cell[J].Yangtze River,2010,41(21):51-54.
    [24]TIMOSHENKO S P,GERE J M.Mechanics of materials[M].New York:Van Nostrand Reinhold Co.,1978.
    [25]唐红梅,叶四桥,祝辉,等.危岩耦合参数研究[J].岩石力学与工程学报,2006,25(1):2641-2649.TANG Hong-mei,YE Si-qiao,ZHU Hui,et al.Research on coupling parameter of perilous rock[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(1):2641-2649.
    [26]李国强,李杰,苏小卒.建筑结构抗震设计[M].北京:中国建筑工业出版社,2002.
    [27]蔡美峰,何满朝,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心