非饱和膨胀土SWCC研究

研究土体吸力与含水量关系，对于非饱和土的变形和强度问题，有重要的应用价值。利用非饱和土三轴仪对膨胀土进行试验研究，比较系统地分析了矿物成分、孔隙结构、土体应力状态、应力历史等因素对土-水特征曲线的影响。尤其土的矿物成分和孔隙结构是主要的影响因素。综合考虑各种因素的影响，通过室内和野外吸力量测，对土-水特征曲线进行拟合、比较，建立了幂函数模型。由土-水特征曲线可知，室内干湿循环土-水特征曲线具有明显的差异性，野外土-水特征曲线的差异性不明显，并与室内浸湿曲线相似。将野外曲线和浸湿曲线结合起来，推算非饱和状态下土的渗透性、抗剪强度等指标，可以较好地解决岩土力学问题。

Study on SWCC of unsaturated expansive soil

It has great important application value to study the relations between suction and moisture of unsaturated soil for its deformation and intensity.With the unsaturated triaxial equipment for expansive soil test,we analyze systematicially the multi-factors such as the components of mineral,the structure of hole,the stress state of soil and the stress history etc.,which affect soil-water characteristic curve(SWCC).Especially the components of mineral and the structure of hole are primary influential factors.Based on the measurement of matric suction indoor and outdoor,we think over synthetically the effect of multi-factors to fit and compare SWCC,also we build the model of power function.And according to SWCC,the otherness is obvious in the curve of dry-damp circulation indoor and not obvious in the curve outdoor,which is similar to the welter curve indoor.The permeability and shear strength etc.of unsaturated expansive soil can be calculated by combining the curve outdoor with welter curve,which has great superiority in solving problems of geotechnical mechanics.