摘要
通过对已有的膨胀岩判别指标的分析,将其分为岩块材料指标、岩粉材料指标以及综合性指标三类;分析了膨胀岩与膨胀土显著差异性,其本质在于膨胀岩的历史成岩作用,因此膨胀岩判别分类标准应充分考虑其成岩胶结作用的影响;在分析岩块材料、岩粉材料判别指标的优缺点的基础上,提出以自由膨胀率、岩块干燥饱和含水率作为快速判别指标,便于工程大范围鉴别,并结合适量的膨胀力、膨胀率试验进行检验核定,保证判别结果的可靠性。最后通过某高铁工程多组样品的分析,表明推荐的膨胀岩判别方法对工程中膨胀岩膨胀潜势的确定是切实可行的。
The existing expansive rock identification index parameters can be classified into three types:rock material indices,rock powder material indices and comprehensive indices.The essential differences between the expansive soil and expansive rock are the history in the deposition of expansive rock.Therefore,the effect of cementation in the deposition of expansive rock should be considered as the index parameter of the expansive rock identification.Based on the thorough understanding of both advantages and disadvantages of the rock material indices and rock powder indices methods,this paper presents a new set of expansive rock identification index parameters,free expansion ratio and dry rock saturation moisture content,for the engineering application.For large engineer application,the conventional parameters such as,expansive force,and expansive ratio,should be references for the reliable expansive rock classification result.The paper also presents the identification results for the expansive rock samples in a high-speed rail project.The results indicate that the recommended expansive rock identification index parameters are reliable in the expansive rock classification.
作者
耿赟
GENG Yun(China Railway Wuhan Survey and Design&Institute Co.Ltd.,Wuhan 430074)
出处
《土工基础》
2021年第2期189-193,共5页
Soil Engineering and Foundation
关键词
膨胀岩
判别指标
分类标准
expansive rock
determination methods
classification criteria
