Study on dynamic stress-strain response law of frozen saline soil

2019 3rd International Workshop on Renewable Energy and Development

能源学;生态环境科学

Zhao, Futang^1 ; Chang, Lijun^1 ; Zhang, Wuyu^1 ; Kou, Guangyun^1 ; Liu, Haoyang^1

School of Civil Engineering, Qinghai University, Xining

810016, China^1

关键词: Confining pressures;    Cyclic dynamic loads;    Dynamic shear modulus;    Dynamic stress strains;    Dynamic triaxial tests;    Maximum dynamic shear modulus;    Negative temperatures;    Shear stress amplitude;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/267/3/032013/pdf
DOI  :  10.1088/1755-1315/267/3/032013

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The subgrade saline soil in a certain area of western Qinghai province was studied, based on the British GDS dynamic triaxial test system, the dynamic triaxial test under laboratory test was carried out to study variation dynamic stress-strain and dynamic shear modulus under the different temperature, frequency and confining pressure. The test results show that the dynamic stress-strain relationship is significantly affected by temperature change under cyclic dynamic load, followed by frequency and confining pressure. Under the same strain amplitude, the lower the temperature, the larger the dynamic shear modulus. When frequency and confining pressure increase, dynamic shear modulus also increases. Whereas, the influence of confining pressure on the dynamic shear modulus is more obvious, and the backbone curve development trend is steeper. Both maximum dynamic shear modulus and final shear stress amplitude increase with the frequency increases when temperature and confining pressure remain unchanged. Meantime, the maximum dynamic shear modulus curve is a convex shape, and the final shear stress amplitude curve is a convex shape at positive temperature,while which a concave shape at negative temperature. At constant frequency and confining pressure, the maximum dynamic shear modulus and final shear stress amplitude increase with the decrease of temperature. Curves of change trend are slower above 0°C, and steeper below 0°C.