Uniaxial compression mechanical properties and damage constitutive model of limestone under osmotic pressure

Abstract

To study the influence of osmotic pressure on the uniaxial compression mechanical properties of limestone, uniaxial compression tests were carried out on limestone specimens under different osmotic water pressure. The test results show that with the increase of osmotic pressure, the closure strain, yield strain and peak strain of limestone gradually increase, while the closure stress, yield stress, peak stress and elastic modulus gradually decrease. To describe the stress-strain response of limestone during uniaxial compression failure, the concepts of compaction factor and osmotic pressure influencing factor were proposed, and a constitutive model of rock compaction stage was established by integrating the relationship between the compaction factor and osmotic pressure influencing factor and the tangent modulus of compaction section. On this basis, combining the continuum damage mechanics theory, and assuming that the rock micro-unit strength obeys the compound power function distribution, a constitutive model reflecting the uniaxial compression mechanical properties of rock under osmotic pressure was established by the statistical method. The rationality of the model was verified using the results of the uniaxial compression test of limestone under different osmotic pressures. The results show that the test results under different osmotic pressures are in good agreement with the theoretical curves, and the model in this paper can reflect the stress-strain response of limestone before its failure under different osmotic pressures.

Experimental investigation on dynamic mechanical properties and fracture evolution behavior of the underground openings with excavation damaged zones

“…In general, EDZ is the surrounding rock with different damage conditions caused by stress concentrations, transient unloading, and some other factors during and after excavation (Chaki et al., 2008; Erarslan and Williams, 2012; Gao and Wang, 2021; Liu et al., 2018; Meng et al., 2016; Song et al., 2021; Yin et al., 2021). In EDZ, the physical and mechanical properties of rock mass, including strength, moduli, stiffness, etc., are obviously reduced.…”

State‐of‐the‐Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels

“…In recent years, the advantages of precast linings, such as plain concrete (PC) and steel fiber-reinforced concrete (SFRC) linings, have been explored, which led to the promotion of its application in tunnel construction. Table 1 presents the literature on experimental studies of precast linings using different materials [14,25,26,58,[75][76][77][78][79][80][81][82]. However, adverse factors in the underwater environment [83,84], such as high-pressure water and weak seabed, lead to the weak performance of the lining (leakage water of the lining joint).…”

“…e bearing capacity and sealing performance of tunnel linings have been widely studied to ensure the safety and durability of tunnel engineering. Most previous studies focused on in situ monitoring and theoretical analysis of tunnel linings subjected to various actions [4,[16][17][18][19][20][21][22][23][24][25][26][27][28]. Generally, the load actions that must be considered in the design and construction of linings include undisturbed land stress, water pressure, pavement traffic load, subgrade reaction, grouting load, and service load [29].…”

“…Generally, the load actions that must be considered in the design and construction of linings include undisturbed land stress, water pressure, pavement traffic load, subgrade reaction, grouting load, and service load [29]. During a longterm operation process, segment linings are inevitably attacked by uneven subsoils, traffic loading, and groundwater leakage [26,[30][31][32], which finally results in extrusion deformation and leakage corrosion [3,25,27,[33][34][35].…”

Investigating the Frequency Spectrum Characteristic of Stress Wave under Multistage Loading Stress

“…To achieve the purpose of reducing disaster prevention and efcient construction, studying on the propagation characteristics of stress wave in rock mass has never stopped and because the energy attenuation essentially causes the stress wave attenuation. Terefore, rock mass instability caused by natural or human activities is studied due to that behaviour not only destroys the stress balance of the original rock but also leads to the phenomenon of stress redistribution [7][8][9][10][11][12].…”