Open AccessStudy on Expansion Mechanism of Mudstone Under Structural Strength
Author(s) -
Jingyu Liu,
Qianli Zhang,
Chen Feng,
Taifeng Li
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/267/5/052005
Subject(s) - expansive , cementation (geology) , expansive clay , geotechnical engineering , volume expansion , geology , compressive strength , deformation (meteorology) , internal forces , mechanism (biology) , materials science , structural engineering , composite material , engineering , cement , soil water , physics , medicine , quantum mechanics , soil science
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.