| 软弱下卧层上持力岩层的端阻力特征值取值 |
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| 引用本文： | 罗照华.软弱下卧层上持力岩层的端阻力特征值取值[J].岩土工程技术,2011,25(6):271-277. |
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| 作者姓名： | 罗照华 |
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| 作者单位： | 湖南省地质工程勘察院,湖南株洲412003;湖南省地质矿产勘查开发局416队,湖南株洲412003;湖南省地建集团基础工程公司,湖南株洲412003 |
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| 摘 要： | 在分析岩体特征和岩体力学强度的基础上,从基于岩石抗拉强度的冲切破坏模式出发,建立起软弱下卧层上岩体的冲切安全指标和冲切端阻值系数数学模型,再利用岩石的力学性质经验数据,计算出沉积岩的拉压系数、冲切安全指标、端阻值系数,并对各自的特征进行了分析,认为以单轴饱和抗压强度为端阻力特征值取值指标,对于软弱下卧层上抗压强度大、拉...
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| 关 键 词： | 软弱下卧层 桩端岩体 抗拉强度 冲切破坏 端阻值系数 |
Characteristis Values of Tip Resistance on the Rock for the Weak Underlying Stratum |
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| Luo Zhaohua.Characteristis Values of Tip Resistance on the Rock for the Weak Underlying Stratum[J].Geotechnical Engineering Technique,2011,25(6):271-277. |
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| Authors: | Luo Zhaohua |
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| Institution: | Luo Zhaohua1,2,3 (1. Exploration Institute of Geological Engineering of Hunan Province; 2. The No. 416 Team of the Bureau of Exploration and Development of Geology and Mineral Resources of Hunan Province; 3. The Foundation engineering geological construction group company of Hunan Province Zhuzhou412003, Hunan China) |
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| Abstract: | From the point of punching damage mode of rock tensile strength, a mathematic model of punching safety indices and punching tip resistance value coefficient was established based on the analysis of rock characteristics and rock mechanical strength. Stretch and compression strength, punching safety indices and tip resistance coefficient of sedimentary rock were calculated by use of the empirical data of mechanical property of rock, and their characteristics were analyzed respectively. It is concluded that it tends to be unsafe that the relative standard provides 3d thickness of hard rock which has high compression strength and low stretch strength overlying weak subsoil bearing strata based on the use of uniaxial saturated compress strength as tip resistance value. The punching tip resistance coefficient of rock with different lithology, integrity and safety classes was calculated by tip resistance mathematic model and rock mechanical empirical data. The proposed value of tip resistance coeffi cient of the rock overlying weak bearing strata is given after comparing the calculation outcomes with resisting compression tip resistance values from references. |
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| Keywords: | weak underlying strata pile tip rock tensile strength punching failure tip resistance coefficient |
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