基于平板压缩试验的岩石单轴抗压强度估算方法研究

发布时间：2018-06-09 01:11

本文选题：尺寸效应修正 + 平板压缩　；参考：《重庆大学》2015年硕士论文

【摘要】：单轴抗压强度是岩土工程领域常用的岩石力学指标之一,在常见的试验研究中多用加工精确的标准岩石试件进行试验。尽管其测试方法相对来说较为简单,但是其耗时、花费昂贵。因此快速简单测定岩石破坏强度、实时分析工程岩体稳定性显得尤为重要。平板压缩试验设备简单便捷,试件来源丰富、搜集便捷,对试件和试验条件要求不高,因此很容易在相关领域进行应用。但因为试件的不规则性,会对试验结果造成诸多影响。因此,深入研究岩石平板压缩试验,并探讨其可行性、影响因素,找到有效修正尺寸效应的方法,在其发展和应用上具有重大科研和工程意义。本文利用平板压缩试验系统进行了不同岩性和含水状态的大量岩石平板压缩试验,并结合相同条件下的标准件单轴压缩试验结果,对其数据进行统计分析,并通过修正其尺寸效应得到有效的平板压缩强度计算公式、准确的单轴抗压强度估算公式。主要研究成果有:(1)利用平板压缩试验系统对不同岩性和不同含水状态等试验条件下的不规则岩石试件进行压缩试验,探讨不规则试件尺寸因素对其强度和破坏形态等方面的影响,并对平板压缩试验中的尺寸效应进行修正;(2)完成了不同高径比和不同直径岩石试件的常规单轴压缩试验,探讨单轴压缩试验中的尺寸效应及其对强度的影响规律;确定合理标准件尺寸,得到不同岩性和不同含水状态下的标准单轴抗压强度;(3)优化平板压缩强度计算公式,有效修正尺寸效应,综合不同条件的平板压缩试验和单轴压缩试验强度结果,得到基于平板压缩试验的单轴抗压强度推导公式;(4)完成对平板压缩试验数据的统计分析,探讨岩石的各向异性对平板压缩强度的影响,并根据统计分析结果确定不同估计误差和置信度条件下平板压缩试验的最少试件数,用以优化实验方案。
[Abstract]:Uniaxial compressive strength is one of the commonly used rock mechanics indexes in geotechnical engineering. Although the test method is relatively simple, it is time consuming and expensive. Therefore, it is very important to measure the failure strength of rock and analyze the stability of engineering rock mass in real time. The plate compression test equipment is simple and convenient, the specimen source is abundant, the collection is convenient, and the requirements for the specimen and test conditions are not high, so it is easy to be applied in the related fields. However, because of the irregularity of the specimen, it will have a lot of influence on the test results. Therefore, it is of great scientific and engineering significance to study the compression test of rock plate, to discuss its feasibility, influencing factors, and to find an effective method to correct the size effect in its development and application. In this paper, a large number of rock plate compression tests with different lithology and water state are carried out by using the flat plate compression test system, and the results of uniaxial compression test of standard parts under the same conditions are analyzed statistically. An effective formula for calculating the compressive strength of a plate and an accurate formula for estimating the uniaxial compressive strength are obtained by modifying its size effect. The main research results are as follows: (1) the compression tests of irregular rock specimens under different lithology and different water-bearing states are carried out by using the flat plate compression test system. The influence of dimension factors of irregular specimen on its strength and failure morphology is discussed. The size effect in plate compression test is corrected. (2) the conventional uniaxial compression tests of rock specimens with different aspect ratios and different diameters are carried out. The size effect in uniaxial compression test and its influence on strength are discussed, and the reasonable size of standard parts is determined, and the standard uniaxial compressive strength under different lithology and water content is obtained. The size effect is corrected effectively, and the results of plate compression test and uniaxial compression test under different conditions are synthesised, and the formula of uniaxial compressive strength derived based on plate compression test is obtained. (4) the statistical analysis of plate compression test data is completed. The influence of anisotropy of rock on the compression strength of flat plate is discussed. According to the statistical analysis results, the minimum number of tests under the condition of different estimation error and confidence is determined to optimize the experimental scheme.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU45

【相似文献】