CAJ | 학술논문

利用相似材料模拟高速铁路隧道基底软岩，采用荷载控制和非对称正弦波循环加载方式对软岩试件进行动三轴疲劳与损伤检测综合试验。通过试验结果分析，建立了软岩3参数多项式疲劳寿命计算模型和4参数多项式累积损伤参量计算模型，获得了软岩疲劳损伤特性，即：软岩疲劳破坏表现为端部拉-剪复合破坏和中部压-剪复合破坏两种模式；疲劳破坏全过程表现为初始微孔隙压密、裂纹发生与稳定扩展以及损伤裂纹加速发展3个发展阶段；软岩疲劳寿命主要取决于本身强度和动应力水平，强度愈高、动力应力水平愈低，其疲劳寿命就越长；当动应力水平相同时，软岩疲劳寿命与其弹性模量呈线性增长关系。
이용상사재료모의고속철로수도기저연암，채용하재공제화비대칭정현파순배가재방식대연암시건진행동삼축피로여손상검측종합시험。통과시험결과분석，건립료연암3삼수다항식피로수명계산모형화4삼수다항식루적손상삼량계산모형，획득료연암피로손상특성，즉：연암피로파배표현위단부랍-전복합파배화중부압-전복합파배량충모식；피로파배전과정표현위초시미공극압밀、렬문발생여은정확전이급손상렬문가속발전3개발전계단；연암피로수명주요취결우본신강도화동응력수평，강도유고、동력응력수평유저，기피로수명취월장；당동응력수평상동시，연암피로수명여기탄성모량정선성증장관계。
The similar materials is used to simulate the soft rock-mass on the basement of tunnel in the high speed railway.Based on the method of loading control and the cyclic loadings of non-symmetrical sine wave,the dynamic fatigue test of three axial and the damage detection test are carried on for soft rock-mass specimens.With analysis of the results of tests,the polynomial model with three parameters to calculate the fatigue life and the polynomial model with four parameters to calculate the cumulative damage are established for soft rock-masses.And then,some characteristics of fatigue damage has been obtained about the soft rock-mass,such as the fatigue failure of soft rock-mass mainly shows two composite modes those are the tension-shear on the end and the compression-shear on the central of specimen.The whole process of fatigue damage is shown three stages those are the compaction of initial micro-pore,the occurrence and stable propagation of new cracks,and the accelerating development of crack damage.The fatigue life of soft rock-mass mainly depends on itself strength and the level of dynamic stress.The higher strength of itself and the lower level of dynamic stress,the longer fatigue life of rock-mass will be.If the level of dynamic stress has not been changed,the fatigue life of soft rock-mass will be increased linearly with its elastic model.