Engineering and Technological Sciences
Abstract
Red beds primarily refer to continental clastic rocks formed during the Jurassic, Cretaceous, Paleogene, and Neogene periods, predominantly in lacustrine, fluvial-lacustrine transitional, or piedmont proluvial facies, which are exposed worldwide. For red bed slopes with interbedded sandstone and mudstone, the key disaster-inducing factor triggering landslides is the damage and deterioration of the mudstone layers. Due to the property of red bed mudstone to deteriorate upon water contact and disintegrate upon dehydration, sampling and specimen preparation are challenging, and few scholars have conducted research on it. Therefore, studying the time-dependent deformation behavior of red bed mudstone under water-rock interaction is of great significance for revealing the creep deformation behavior of slopes. This study takes red bed mudstone from southwestern China as the research object, conducts triaxial creep tests under different saturation durations, and analyzes the creep deformation, creep rate, and long-term strength of red bed mudstone. Based on traditional creep models, a nonlinear viscoplastic body is proposed, and a one-dimensional creep constitutive model is established. By introducing the initial damage and process damage of water-rock interaction into this model, a damage creep constitutive model for red bed mudstone is constructed, and the model parameters are calibrated. The model is further extended from one-dimensional to three-dimensional. The new constitutive model can effectively reflect the creep characteristics of red bed mudstone during the saturation process.
Full Text
Study on Rheological Damage Constitutive Model of Red Bed Mudstone Considering Water Saturation Time
Hongke Zhou¹
PowerChina Guiyang Engineering Corporation Limited, Guiyang 550081
¹ Power China Guiyang Engineering Corporation Limited, Guiyang 550081
Abstract
Red beds primarily refer to continental clastic rocks formed during the Jurassic, Cretaceous, Paleogene, and Neogene periods, dominated by lacustrine, fluvial-lacustrine transitional, or piedmont proluvial facies, which are exposed worldwide. For red bed slopes with interbedded sandstone and mudstone, the key disaster-inducing factor triggering landslides is the damage and deterioration of the mudstone layers. Due to the property of red bed mudstone to deteriorate upon water contact and disintegrate upon water loss, sampling and specimen preparation are challenging, and few scholars have conducted research on it.
Therefore, studying the time-dependent deformation behavior of red bed mudstone under water-rock interaction is of great significance for revealing the creep deformation behavior of slopes. This study takes red bed mudstone from southwestern China as the research object, conducts triaxial creep tests under different water saturation durations, and analyzes the creep deformation, creep rate, and long-term strength of red bed mudstone.
Based on traditional creep models, a nonlinear viscoplastic body is proposed, and a one-dimensional creep constitutive model is established. By introducing the initial damage and process damage from water-rock interaction into this model, a damage creep constitutive model for red bed mudstone is constructed, and the model parameters are calibrated. The model is further extended from one-dimensional to three-dimensional. The new constitutive model can effectively reflect the creep characteristics of red bed mudstone during the water saturation process.
Keywords: red beds; water-rock interaction; constitutive model; creep
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This version posted 2025-09-02.