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Study on rock strength deterioration and weathering for soft and semi-hard rocks in dry-wet cyclic conditions

干湿循环条件下软、半硬岩石强度劣化及风化研究

基本信息

批准号：
11650960
负责人：
ICHINOSE Masatomo
金额：
$ 0.51万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650960/
关键词：
Rock mass (underground) structure Soft rock, semi-hard rock Stability for semi-long and long term Dry-wet cyclic condition Weathering Change of the mechanical properties Guideline of weathering 岩盤構造物中・長期的な安定性岩石の風化内部構造の変化

项目摘要

The subjects of this research is to understand about the mechanism of the deterioration of rock strength in the dry-wet cyclic conditions, how to establish an evaluation method of them and to suggest a technical guideline to judge a grade of the weathering by the internal structures of rock such as porosity, distribution of the diameter of pores, the specific surface areas and cracks.The outline of this research is as follows :1) It is understood that the mechanical properties of measures rocks such as shale that were collected from Indonesian and domestic coal mines.2) The slaking phenomenon was examined by the slaking observation method and the ISRM suggested method. Those results show the slaking deterioration was recognized for all rock specimens. The extent of slaking deterioration of Indonesian specimens was larger than that of domestic specimens.3) The porosity and the distribution of the diameter of pores of specimens were obtained by the mercury pressure method. From the comparison between the Indonesian specimens and the domestic specimens, the distributions of the diameter of pores of Indonesian specimens are similar to that of domestic ones, however, the total volume of the pores of Indonesian ones are larger that domestic ones.4) The mechanical properties such as the unconfined compressive strength, the Brazilian strength and Young's modulus after testing in the dry-wet cyclic conditions were 1/2 to 1/3 lower than those of dry specimens. Specially, some specimens for the mechanical testing could not be obtained due to slaking phenomenon. We are now considering how to evaluate the characteristics for those types of rocks.5) Visualization of the internal cracks and pores was carried out by the X-ray CT.It is possible to evaluate only the qualitative visualization for the sizes of 50-100 μ m of cracks and pores.

本研究的主要目的是了解干湿循环条件下岩石强度劣化的机理，建立岩石强度劣化的评价方法，并提出根据岩石内部结构如孔隙度、孔径分布、比表面积、裂隙等来判断岩石风化程度的技术指标。1）了解了从印度尼西亚和国内煤矿采集的页岩等测量岩石的力学性质。2）通过崩解观察方法和ISRM建议的方法检查了崩解现象。这些结果表明，所有岩石标本的崩解恶化。印尼土样的湿化劣化程度大于国产土样。3）采用压汞法测定了土样的孔隙率和孔径分布。通过对印尼试件与国内试件的对比，发现印尼试件的孔隙直径分布与国内试件相似，但印尼试件的孔隙总体积大于国内试件。在干-湿循环条件下测试后的巴西强度和杨氏模量比干燥试样的巴西强度和杨氏模量低1/2至1/3。特别是，由于湿化现象，无法获得用于机械测试的一些试样。我们现在正在考虑如何评估这些类型岩石的特性。5）通过X射线CT进行内部裂缝和孔隙的可视化。对于50-100 μ m的裂缝和孔隙尺寸，可以仅进行定性可视化评估。