| 基于Hoek-Brown强度准则的嵌岩桩极限承载力确定 |
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| 引用本文： | 赵明华,雷 勇,马缤辉. 基于Hoek-Brown强度准则的嵌岩桩极限承载力确定[J]. 水利学报, 2011, 42(9) |
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| 作者姓名： | 赵明华 雷 勇 马缤辉 |
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| 作者单位： | 湖南大学土木工程学院,湖南长沙,410082 |
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| 基金项目： | 国家自然科学基金资助项目(50578060) |
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| 摘 要： | 考虑岩体结构的完整性、岩块单轴抗压强度及三向应力等因素的影响,引入Hoek-Brown岩石强度准则,采用Lambe变换,建立了较为实用的嵌岩桩桩侧摩阻力模型。然后基于简化的桩端岩体破坏模式,利用极限平衡原理,推导了三向压力下嵌岩桩桩端阻力的计算公式,进而获得嵌岩桩极限承载力计算公式。对公式参数分析表明：岩体质量对摩阻力影响较大,岩体质量越好,摩阻力τr越大,反之越小;岩体质量评价指标RMR值为100时,摩阻力τr可达到0.4σc;岩体质量评价指标RMR值为10时,摩阻力τr接近0.01σc。最后以2个工程实例对本文计算方法进行了验证。
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| 关 键 词： | 桥梁工程 嵌岩桩 岩体力学 Hoek-Brown强度准则 极限承载力 |
Detemination of ultimate bearing capacity of rock-socketed pile based on H-B strength criterion |
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| ZHAO Ming-hu,LEI Yong and MA Bin-hui. Detemination of ultimate bearing capacity of rock-socketed pile based on H-B strength criterion[J]. Journal of Hydraulic Engineering, 2011, 42(9) |
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| Authors: | ZHAO Ming-hu LEI Yong MA Bin-hui |
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| Affiliation: | ZHAO Ming-hua,LEI Yong,MA Bin-hui(Hunan University,Changsha 410082,China) |
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| Abstract: | Considering the impacts of integrity of rock structures,rock uniaxial compressive strength and three-dimensional pressure,the Hock-Brown strength criterion for rock mass was introduced to obtain a new practical model of skin friction for rock-socketed piles with Lambe Transformation.Then,based on the failure mode of rock mass at the pile tip,a formula of rock-socketed pile tip resistance under three-dimensional pressure was derived by means of the ultimate equilibrium principle.Thus the ultimate bearing cap... |
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| Keywords: | bridge engineering rock-socketed piles rock mechanics Hoek-Brown strength criterion ultimate bearing capacity |
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