| 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): |
| 基于Hoek-Brown强度准则的嵌岩桩极限承载力确定 |
| Detemination of ultimate bearing capacity of rock-socketed pile based on H-B strength criterion |
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| DOI： |
| 中文关键词: 桥梁工程 嵌岩桩 岩体力学 Hoek-Brown强度准则 极限承载力 |
| 英文关键词: bridge engineering rock-socketed piles rock mechanics Hoek-Brown strength criterion ulti?mate bearing capacity |
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| 中文摘要: |
| 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τ r越大，反之越小；岩体质量评价指标RMR值为100时，摩阻力τ r可达到0.4σc；岩体质量评价指标RMR值为10时，摩阻力τ r接近0.01σc。最后以2 |
| 英文摘要: |
| 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 capacity formula of rock-socketed pile was obtained. Parametric analysis shows that rock mass quality influences intensively on friction resistance，the better the rock mass quality is，the higher the friction resistance τ it would be. When the rock mass quality evaluation RMR value is 100，the friction resistanceτ can mostly reach 0.4 times σc；while the RMR value is 10，the friction resistance τ can approach 0.01 times σc. Finally，two examples of projects are given to verify the calculation method. |
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