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Analysis on Influence Factors of the Ultimate Bearing Capacity for Rock Foundation Close to a Slope Based on Hoek-Brown Criterion
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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。
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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. -
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