中文摘要：

为避免基质吸力量测所带来的困难，通过寻找总应力抗剪强度指标与含水率w之间的关系，建立类似于饱和土的抗剪强度公式，对实际工程具有较强的应用价值。在制件过程中采取相应措施消除压实度和龄期等因素的干扰，确保试验结果能够真实反映含水率对抗剪强度的影响。在普通三轴仪上进行非饱和粉煤灰的抗剪强度试验，得到其总应力强度指标随含水率的变化规律。其中，非饱和粉煤灰的粘聚力c值随含水率的增加呈先增大后减小的二次抛物线变化，内摩擦角φ值随含水率的增加呈线性衰减。通过引入含水率，建立了非饱和粉煤灰总应力强度公式，公式中的含水率易于确定，抗剪强度计算简单，便于实际工程应用。

英文摘要：

In order to avoid the difficulties brought about by the matric suction measurement, establishing the relationship between total stress of shear strength indexes and moisture content w, which is similar to the establishment of the shear strength formula of saturated soil, is of practical value in engineering practice. By taking some measures to eliminate the influence of factors such as compaction degree and age during the working process, it is ensured that the test results can truly reflect the effect of moisture content against the shear strength. A shear strength test of unsaturated fly-ash on conventional tri-axial apparatus is conducted. The test results show that the cohesion value of the unsaturated fly-ash c changes with the moisture content, first increasing and then decreasing, showing a quadratic parabola relationship. The angle of internal friction q~ also changes with the increase in the moisture content, showing a linear attenuation. The total stress strength formula of the unsaturated fly-ash is established by introducing the moisture content, in which the moisture content is easy to determine. Furthermore, the formula is of an important practice value.