Study on Expansion Mechanism of Mudstone Under Structural Strength

2019 3rd International Workshop on Renewable Energy and Development

能源学;生态环境科学

Liu, Jingyu^1^2 ; Zhang, Qianli^2 ; Chen, Feng^2 ; Li, Taifeng^2

China Academy of Railway Science, Beijing

100081, China^1

State Key Laboratory of Track Technology of High-speed Railway, China Academy of Railway Science, Beijing

100081, China^2

关键词: Expansion and deformation;    Expansion mechanism;    Expansive soils;    External action;    Research results;    Structural strength;    Uniaxial compressive strength;    Verification tests;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/267/5/052005/pdf
DOI  :  10.1088/1755-1315/267/5/052005

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

As the structural swelling soft rock, mudstone's expansion mechanism is similar to expansive soil, but it has its own particularity. In this paper, based on the analysis of the difference between the undisturbed and remolded samples of mudstone in terms of expansion and deformation, the expansion mechanism considering the strength of mudstone structure was proposed, and the verification test was designed. The following research results were obtained: In judging the potential of mudstone expansion, it is defective to rely solely on the free expansion rate, and its structural strength should be fully considered; The expansive force of mudstone is divided into the external expansive force resisting the external action and the internal expansive force resisting the interaction between internal particles. The external expansive force is the main reason of the increase of the volume of mudstone, and the internal expansive force is related to the cementation strength inside mudstone; The expansion theory based on free expansion rate, expansion force and uniaxial compressive strength is proposed.