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研究目的:为了在边坡极限平衡分析中,能够正确确定控制性结构面的抗剪强度,从而为边坡的稳定性分析及其防护工程提供可靠的依据。研究方法:在系统研究Barton公式的基础上,结合2个边坡工程现场勘察取样、室内实验、提出了结构面粗糙度的确定方法,并通过实例验证。研究结果:提出了采用坡度均方根系数来确定JCS的方法,拟合出二者的关系式,提高了其准确性和适用性;对于软弱结构面,提出根据充填厚度(平直型软弱结构面)或充填度(粗糙型软弱结构面)确定其抗剪强度参数的方法和原则。研究结论:研究表明,在粗糙度系数准确测量的基础上,Barton估算方法提供的岩体结构面抗剪强度参数,可直接用于工程岩体稳定性评价,该方法预测岩体结构面抗剪强度是可靠的,且具有简便、经济、快速等优点,特别适用于公路、铁路路堑边坡稳定性计算评价。
Research purposes: In order to accurately determine the shear strength of the controllable structural plane in the slope balance analysis, it provides a reliable basis for the slope stability analysis and protection project. Research Methods: On the basis of systematic study of Barton’s formula, combined with two site survey and sampling and laboratory experiments in slope engineering, a method to determine the roughness of structural surface is proposed and verified by an example. Research results: The method of using the root mean square coefficient of slope to determine JCS is proposed, and the relationship between them is fitted to improve its accuracy and applicability. For the weak structure surface, the method of calculating the JCS based on the filling thickness Surface) or degree of filling (rough weak structural plane) to determine the shear strength parameters of the method and principle. Research conclusions: The research shows that on the basis of accurate measurement of roughness coefficient, the parameters of shear strength of rock mass discontinuities provided by Barton’s estimation method can be directly used to evaluate the stability of engineering rock mass. The method predicts the shear resistance The strength is reliable, and has the advantages of simplicity, economy and speediness, and is especially suitable for the calculation and evaluation of the stability of the road and railway cutting slope.