Experimental Investigation of the Permeability and Mechanical Behaviours of Chemically Corroded Limestone Under Different Unloading Conditions

• DOI: 10.1007/s00603-019-01961-y
• Publication Date: 2019-11-04T16:02:56Z
• Authors: Hao Li; Zuliang Zhong; Kenneth Imo-Imo E...; Yong Sheng; Xinrong Liu; Dongmin Yang
• Keywords: Inflection point; Hydrostatic pressure

Abstract This paper investigates the mechanical properties and permeability of chemically corroded rock during deep underground tunneling. Nuclear magnetic resonance tests are carried out to quantify chemical damage limestone samples at microscopic scale. Coupled hydrostatic pressure-unloading different unloading rates also conducted on these investigate changes effects behaviours. Magnetic imaging, T 2 spectrum distribution porosity obtained, micro is visualized quantified. The relationship between behaviors under hydrochemical–mechanical coupled investigated. results show that development process can be divided into three stages: first stage, initially decreases, second stage starts inflection point curve, from where begins increase slightly. At third increases dramatically until sample ruptured. Chemical corrosion have a combined significant influence cracks in rocks, which root cause changes. A stress-permeability model proposed describe stresses chemical-corroded limestone; this adopted for other sedimentary rocks.