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以天津海积软黏土为研究对象,对原状土及重塑土进行了不同固结压力、加荷速率、排水条件下的三轴剪切试验,以应力比结构性参数与应变间的指数型关系来描述结构性衰减的平缓-加速-平缓3阶段,研究了软黏土结构损伤的影响因素。结果表明,固结压力小于结构屈服应力时,结构性损伤基本不受固结压力影响,固结压力大于结构屈服应力时,固结压力越大,初始结构性越小,结构损伤发展越慢;提高加荷速率或设置排水条件,可以延长第1阶段平缓损伤段,降低加速损伤段的损伤速率。结果还表明,结构损伤的影响因素可以概括为外力作用和增湿作用两大类。
Taking Tianjin marine soft clay as the research object, triaxial shear tests were carried out on undisturbed soil and remolded soil under different consolidation pressure, loading rate and drainage conditions. The stress-strain structural parameters and exponential strain Relationship to describe the structural attenuation of the smooth - accelerated - smooth three stages, the structural damage of soft clay studied the impact of factors. The results show that when the consolidation pressure is less than the structural yield stress, the structural damage is basically unaffected by the consolidation pressure. When the consolidation pressure is greater than the structural yield stress, the consolidation pressure is larger and the initial structure is smaller and the structural damage develops more slowly. Increase the loading rate or set the drainage conditions, you can extend the first stage of gentle injury segment, reduce injury speed injury segment. The results also show that the impact of structural damage can be summarized as two major categories of external forces and humidification.