摘要
为保证地下工程土体在开挖过程中的稳定性和安全性,通常利用人工冻结法建立临时冻结壁,探究在低温条件下周围土体的强度特性、蠕变变形规律等物理力学行为至关重要。在冻结砂土单轴抗压强度试验基础上,对其进行不同温度以及加载应力下的单轴压缩蠕变试验,并进行影响因素分析。引入S-M经验蠕变模型,考虑温度和加载应力的影响,对模型参数进行识别,得到改进的冻结砂土S-M经验蠕变模型。西北地区的砂土单轴压缩蠕变试验结果表明,该模型能较好地预测冻结砂土衰减蠕变阶段和稳定蠕变阶段的变形值,为人工冻结法更好地应用于实际工程提供一种理论支撑。
In order to ensure the stability and safety of the underground engineering soil during the excavation process,the artificial freezing is usually used to establish a temporary freezing wall.It is crucial to explore the physical and mechanical behaviors of the surrounding soil under low temperature conditions such as the strength characteristics and creep deformation law.Based on the uniaxial compressive strength test of frozen sand,the uniaxial compressive creep tests under different temperatures and loading stresses are carried out,and the influencing factors are analyzed.By introducing the S-M empirical creep model,and considering the influence of temperature and loading stress,the model parameters are identified,and then an improved frozen sand S-M empirical creep model is got.The uniaxial compression creep test results of sand in Northwest China show that the model can better predict the deformation values of frozen sand in the attenuation creep stage and the stable creep stage,providing a theoretical support for the artificial freezing method to be better applied to practical engineering.
作者
杨明
马祖飞
高亚飞
张雯
YANG Ming;MA Zufei;GAO Yafei;ZHANG Wen(Shaanxi 185 Coalfield Geology Co.,Ltd.,Yulin 719000,Shaanxi,China;College of Civil Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China)
出处
《水力发电》
CAS
2021年第9期59-63,共5页
Water Power
基金
陕西省煤田地质集团有限公司科研项目(SMDZ-2019CX-7)。
