摘要
本文通过大量的试验,探讨了软岩(泥岩、砂质泥岩)膨胀过程的宏观显现规律。借助于扫描电镜的观察,分析了膨胀过程中岩石内部颗粒结构的微观变化特征。据此提出了软岩膨胀的力学模型σ=Eε+ηε+σ_s,并指导出动变区的膨胀应变数学表达式ε=1/E[((?)t-(σ_s+η/E(?))(1-e^(-E/ηt))]和稳变区的表达式ε=σ-σ_s/E(1-e^(-E/ηt)),并阐述了软岩的膨胀机理。
This paper discusses the macroscopic behavior of swelling process of soft rocks (mudstone and sandy mudstone) based on a great number of tests. The microscopic characteristics of internal grain structure in the swelling process is analyzed by using a scanning electronic microscope. Based on which a mechanical model for soft rock swelling, i.e. σ=Eε+ηε+σ_s,is proposed. And a mathematic expression of swelling strain in dynamic change zone,namely, ε=1/E[(?)t-(σ_s+η/E(?) ×(1-e^(-E/η t))] and that in steady change zone, i. e. ε=σ-σ_s/E(1-e^(-E/η t)) are derived. The paper also depicts mechanism for sorft rock swelling.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
1990年第2期31-38,共8页
Journal of China Coal Society
关键词
软岩
膨胀
规律
机理
巷道
weak and soft rocks
swelling rule
swelling mechanism
macroscopic behavior
microscopic characteristics
