软弱下卧层上持力岩层的端阻力特征值取值
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、拉压系数小的桩端硬质岩体,3 d厚度的规范规定是偏于不安全的,因此应将抗拉强度纳入桩端岩体端阻力特征值的取值指标体系。利用端阻值系数数学模型和岩石的力学性质经验数据计算出不同岩性、不同完整性、不同安全等级的岩体冲切端阻值系数,将计算结果与文献的抗压端阻值系数比较分析后提出了软弱下卧层上岩体的端阻值系数建议值。
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 coefficient of the rock overlying weak bearing strata is given after comparing the calculation outcomes with resisting compression tip resistance values from references.
中文标题：
软弱下卧层上持力岩层的端阻力特征值取值
Characteristis Values of Tip Resistance on the Rock for the Weak Underlying Stratum
作者：
罗照华1,2,3
Luo Zhaohua1,2,3
作者简介:罗照华,1961年生,男,汉族,江西南康人,高级工程师,长期从事水文地质和岩土工程的生产研究工作。E-mail:570169952@qq.com
通讯地址：
1. 湖南省地质工程勘察院, 湖南株洲 412003; 2. 湖南省地质矿产勘查开发局416 队, 湖南株洲 412003; 3. 湖南省地建集团基础工程公司, 湖南株洲 412003
1.ExplorationInstituteofGeologicalEngineeringofHunanProvince; 2.TheNo.416TeamoftheBureauofExplorationandDevelopmentofGeologyandMineralResourcesofHunanProvince; 3.TheFoundationengineeringgeologicalconstructiongroupcompanyofHunanProvinceZhuzhou412003,HunanChina
中图分类号:TU443
doi:10.3969/j.issn.1007-2993.2011.06.001
出版物：岩土工程技术
收稿日期:2011-09-27
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
Key words:weak underlying strata,pile tip rock,tensile strength,punching failure,tip resistance coefficient
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