登录
注册
E-alert
登录
注册
E-alert
Analysis on Influence Factors of the Ultimate Bearing Capacity for Rock Foundation Close to a Slope Based on Hoek-Brown Criterion
-
摘要: 岩石地基极限承载力是岩石力学领域一个广泛讨论和研究的课题,基于Hoek-Brown准则,通过MIDAS/GTS软件建立有限元模型,分别针对不同的地质强度指标、岩石力学参数、扰动因子、坡顶距和斜坡角探究条形基础下临坡岩石地基极限承载力问题。结果表明:1)基于Hoek-Brown准则,使用有限元软件MIDAS/GTS按照平面应变问题建立的临坡岩石地基数值模型计算条形基础下临坡岩石地基极限承载力的方法是可靠的;2)定义了一个无量纲参数Nσ来衡量临坡对岩石地基极限承载力的影响,Nσ随着地质强度指标的增大而增大,随着岩石力学参数的增大而增大,随着扰动因子的增大而减小;3)随着坡顶距的增大,Nσ逐渐增大,而不同斜坡角对应的Nσ越来越接近,最终临坡岩石地基的极限承载力会慢慢趋于水平岩石地基极限承载力;4)随着斜坡角的减小,Nσ逐渐增大,而不同坡顶距对应的Nσ越来越近似,最终临坡岩石地基的极限承载力会逐渐趋于水平岩石地基极限承载力。
-
关键词:
- Hoek-Brown准则 /
- 临坡岩石地基 /
- 条形基础 /
- 极限承载力 /
- 数值模拟
Abstract: The ultimate bearing capacity of rock foundation is a widely discussed and researched subject in the field of rock mechanics. A finite element model was constructed by MIDAS/GTS Software based on Hoek-Brown Criterion. According to different geo-mechanical indexes, rock mechanical parameters, disturbance factors, ratios of distance form edges of fundations near slopes to width of froundations, and slope angles, the ultimate bearing capacity of rock foundation under strip foundations was explored. The results indicated that: 1) based on Hoek-Brown Criterion, the numerical model of rock foundation close to slopes was constructed by the finite element software MIDAS/GTS according to plane strain. The method for calculating the ultimate bearing capacity of rock foundation under strip foundations close to slopes was reliable; 2) a dimensionless parameter Nσ was defined to measure the influence of slopes on the ultimate bearing capacity of rock foundation. Nσ increased with the increase of the geo-mechanical indexes, and decreased with the increase of the disturbance factor. 3) With the increase of the slope top distance, Nσ gradually increased, but the corresponding Nσ at different slope angles were increasingly similar. Finally, the ultimate bearing capacity of rock foundation close to slopes gradually approached the ultimate bearing capacity of horizontal rock foundation; 4) with the decrease of slope angles, Nσ gradually increased, but Nσ in different ratios of distance from edges of foundetions near slopes to width of foundations were increasingly similar. Finally, the ultimate bearing capacity of rock foundation close to slopes gradually approached the ultimate bearing capacity of horizontal rock foundation. -
[1] 中华人民共和国住房和城乡建设部. 建筑地基基础设计规范:GB 50007-2011[S].北京:中国建筑工业出版社,2012. [2] 李凯,陈国荣.基于滑移线场理论的边坡稳定性有限元分析[J].河海大学学报(自然科学版),2010,38(2):191-195. [3] 曾亚武,田伟明.边坡稳定性分析的有限元法与极限平衡法的结合[J].岩石力学与工程学报,2005(增刊2):5355-5359. [4] 胡卫东,曹文贵,袁青松.临坡双层黏土地基极限承载力的上限分析[J]. 湖南大学学报(自然科学版),2016,43(1):110- 116. [5] 蒋德松,赵明华,胡可馨,等.多溶洞地层中路基承载力有限元极限分析[J].土木工程学报,2019,52(6):119-128. [6] 汤开宇,王乐华,胡静,等.Hoek-Brown准则参数对边坡稳定性影响的敏感性分析[J].水力发电,2015,41(1):21-23,69. [7] 刘昱君,刘明扬,杜文杰.基于广义Hoek-Brown准则的多参数强度折减法在边坡稳定性分析中的应用[J].科技和产业,2021,21(8):255-261. [8] 张东旭,侯克鹏,杨志全,等.广义Hoek-Brown准则在露天矿边坡稳定性分析中的应用[J].矿产保护与利用,2015(1):21-26. [9] 于远忠,宋建波.经验参数m、s对岩体强度的影响[J].岩土力学,2005(9):1461-1463,1468. [10] HOEK E, BROWN E T. Underground excavations in rock[M].London:Institution of Mining and Metallurgy, 1980. [11] 许明,张永兴.岩石力学[M]. 4版.北京:中国建筑工业出版社,2020. [12] HOEK E,CARRANZA T,CORKUM B.Hoek-Brown Criterion:2002 edition[C]//Proc NARMS-TAC Conference.2002:267-273. [13] 刘立鹏,姚磊华,陈洁,等.基于Hoek-Brown准则的岩质边坡稳定性分析[J].岩石力学与工程学报,2010,29(增刊1):2879-2886. [14] 苏永华,封立志,李志勇,等.Hoek-Brown准则中确定地质强度指标因素的量化[J].岩石力学与工程学报,2009,28(4):679-686. [15] 朱玺玺,陈从新,夏开宗.基于Hoek-Brown准则的岩体力学参数确定方法[J].长江科学院院报,2015,32(9):111-117. [16] 李培勇,杨庆,栾茂田.Hoek-Brown岩石破坏经验判据确定岩石地基承载力的修正[J].岩石力学,2005(4):664-666. [17] 宋建波,于远忠.剪切破坏模式下确定均质岩基极限承载力的两种方法[J].工程地质学报,2001(3):317-320. [18] 宋建波,于远忠.剪切破坏模式下均质岩基极限承载力的Bell解[J].岩石力学与工程学报,2002(3):410-412. -
点击查看大图
计量
- 文章访问数: 88
- HTML全文浏览量: 21
- PDF下载量: 3
- 被引次数: 0
下载:
