中美关于岩基抗剪强度参数试验与取值的对比研究

发布时间：2018-09-15 20:21

【摘要】：结合国际岩体力学学会建议的原位直剪试验方法,对比研究了中美关于岩基抗剪强度参数的试验方法与取值、设计抗剪强度选取等内容。研究表明,中美关于岩基抗剪强度的试验方法基本相同,最常用的是直剪试验,但在试样的制备和试验过程存在若干差异,主要表现在试样尺度和荷载的施加控制方式上。在试验资料不足或可行性研究阶段和初步设计阶段,中美两国选取设计抗剪强度主要根据同类型工程的经验数据确定。在试验资料充足时,美国岩基抗剪强度的设计值一般是根据实验室直剪试验和现场试验结果综合确定,可由试验散点图的下界限强度得到。最后,以美国一工程为例,分析说明了美国岩基设计抗剪强度取值保证率高于中国通常按小值平均(78.7%)取定的抗剪强度参数所具有的安全水平。
[Abstract]:Based on the in-situ direct shear test method proposed by the International Society of Rock Mechanics, the test methods and values of shear strength parameters of rock foundation in China and the United States, and the selection of design shear strength are compared and studied. The results show that the test methods of shear strength of rock foundation in China and America are basically the same, the most commonly used is the direct shear test, but there are some differences in the preparation and test process of the specimen, mainly in the scale of the specimen and the control mode of load application. In the stage of insufficient test data or feasibility study and preliminary design, the shear strength selected by China and the United States is mainly determined by the empirical data of the same type of engineering. When the test data are sufficient, the design value of rock foundation shear strength in the United States is generally determined from the results of direct shear test and field test, and can be obtained from the lower limit strength of the test scatter diagram. Finally, taking a project in the United States as an example, it is shown that the assurance rate of the shear strength of the rock foundation design in the United States is higher than the safety level of the shear strength parameters usually obtained in China according to the average of small values (78.7%).
【作者单位】：武汉大学水资源与水电工程国家重点实验室;
【分类号】：TV223

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