The multi-stage vertical stress under the action of red brown-basalt residual soil water characteristic curve by the utilization of unsaturated consolidation apparatus was adopted to analyze the vertical stress of basalt residual soil -wa-ter characteristic curve model parameter of soil -water characteristic curve is obtained by making use of parameter model to match the test result and exploration of changing rule is also made .The results show that vertical stress plays an unig-norable influence on soil-water characteristic curve .The larger the vertical stress is ,the more difficult soil moisture is discharged and the slower the reducing rate is ;the larger the vertical stress is ,the less discharge capacity of moisture and the greater residual moisture content .If model fitting effect is good ,parameters B0 and t increase while parameter B1 de-creases along with magnification of vertical stress .Quantitative relational expressions between various parameters and ver-tical stress are acquired to establish the function expression of soil -water characteristic curve of vertical stress in consid-eration of wide range .%为探究应力作用对土-水特征曲线的影响,采用非饱和土固结仪,测得了由低到高多级竖向应力作用下的重塑红棕色玄武岩残积土土-水特征曲线,并在此基础上分析了竖向应力对玄武岩残积土土-水特征曲线的影响,利用参数模型对试验结果进行拟合,获得了土-水特征曲线的模型参数,并探讨了其变化规律.结果表明:竖向应力对土-水特征曲线有不可忽视的影响,竖向应力越大,土体水分越不容易排出且减少的速率越慢,土体残余含水率越大,增加相同的基质吸力时,竖向应力越大水分排出量越少,曲线越平缓;模型的拟合效果较好,随着竖向应力的增大,参数B0、t增加,参数B1减小,得到各参数与竖向应力的定量关系式,建立了可以考虑较大范围竖向应力的土-水特征曲线函数表达式.
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