Freeze-thaw damage analysis of expansive soils based on natural strain damage model
ZHAO Shun-li1, DENG Wei-jie1, LU Xin-jing1, FANG Xu-dong1, LI Xue-tong2
1. Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China; 2. College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China
Abstract:The quantitative freeze-thaw damage analysis of expansive soils is of great practical significance for engineering in cold regions. In view of the unreasonable selection of strain model in the existing researches on soil damage model, the concept of natural strain is introduced. Based on the theory of Weibull statistics and strain equivalence, a natural strain damage model is constructed. Through genetic algorithm, the global optimization function of model parameters is further realized. With the test data of expansive soils after freeze-thaw cycles, the damage model is verified, and the freeze-thaw damage analysis of expansive soils is further carried out. The non-damage deformation and damage deformation are distinguished to further verify the rationality of the damage model. The results show that the natural strain damage model can simulate the stress-strain curve of expansive soils after different freeze-thaw cycles with high accuracy. The initial stiffness and macro-strength have negative exponential relationship with the number of freeze-thaw cycles, and the non-damage deformation and damage deformation have good correspondence with the test curves of lateral compression and triaxial compression.
赵顺利, 邓伟杰, 路新景, 方旭东, 李雪统. 基于自然应变损伤模型的膨胀土冻融损伤分析[J]. 岩土工程学报, 2020, 42(S1): 127-131.
ZHAO Shun-li, DENG Wei-jie, LU Xin-jing, FANG Xu-dong, LI Xue-tong. Freeze-thaw damage analysis of expansive soils based on natural strain damage model. Chinese J. Geot. Eng., 2020, 42(S1): 127-131.
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