冻融循环作用下饱和软土的力学与孔隙结构响应特征  

Mechanical and Microstructural Response of Saturated Soft Soil Under Freeze-thaw Cycles Conditions

作　　者：马盛元 陈韬 MA Sheng-yuan;CHEN Tao(Wenzhou Engineering Investigation Institute Co.,LTD.,Wenzhou 325006,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]温州工程勘察院有限公司,浙江温州325006 [2]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2025年第4期106-109,共4页Water Resources and Power

基　　金：国家自然科学基金项目(52107148);浙江省科技人才专项计划项目(ZJSTK-2022A-022)。

摘　　要：为探究饱和软土的冻融损伤规律,开展三轴剪切试验与核磁共振扫描,获得了不同冻融循环次数N的强度和结构特征参数。结果表明,随着N增加,粘聚力c和内摩擦角φ下降,c值衰减幅度明显高于φ值,即冻融循环主要引起胶结强度弱化;当N超过8次后,强度衰减趋于稳定;孔隙体积分布曲线呈双峰分布,冻融循环导致大孔隙快速扩张;饱和软土的孔隙参数与强度指标存在线性相关性,说明力学性能与结构对冻融循环的响应具有同步性。In order to investigate the freeze-thaw damage law of saturated soft soil,triaxial shear test and nuclear magnetic resonance scanning were carried out,and the strength and structural characteristics of different freeze-thaw cles cy-N were obtained.The results show that with the increase of N,the cohesion c and the internal friction angleφcrease,de-and the attenuation range of c value is significantly higher than that ofφ,that is,the freeze-thaw cycle mainly causes the weakening of cementing strength.When N exceeds 8 times,the intensity attenuation tends to be stable.The pore volume distribution curve is bimodal,and the freeze-thaw cycle results in the rapid expansion of large pores.There is a linear correlation between the pore parameters and the strength index of saturated soft soil,which indicates that the chanical me-properties and the response of the structure to the freeze-thaw cycle are synchronized.

关 键 词：饱和软土 冻融循环 强度 孔隙分布 

分 类 号：TU447[建筑科学—岩土工程] TV16[建筑科学—土工工程]