有荷条件下南阳膨胀土强度试验及其应用

Experimental study on strength characteristics of Nanyang expansive soil under loading and its application

对南阳膨胀土进行了不同竖向荷载作用下的浸水膨胀变形及其膨胀后试样的强度试验,得到了南阳膨胀土浸水膨胀率随浸水膨胀过程中所受的竖向荷载的增大而减小,而膨胀完成后试样的抗剪强度指标(c、φ值)随竖向荷载的增大而增大的变化规律。得出了抗剪强度指标变化规律的数学拟合公式,并将其应用于土工袋处理膨胀土边坡(表层处理的一种)的稳定性分析中,论证了土工袋处理膨胀土边坡的压重效果。

Swelling tests for Nanyang expansive soil under different vertical loads are carried out,and the shear strengths of the swelled samples are thereafter determined by direct shear tests.It was found that,with the increasing vertical loads applied during swelling,the swelling deformation of Nanyang expansive soil decreases,whereas the shear strength of swelled samples increases.The strength parameters cohesion c and internal friction angle φ are correlated with the vertical loads applied during the swelling,which are then used to analyze the stability of an expansive soil slope reinforced with soilbags（a kind of treatment for reinforcing the slope surface）.The effectiveness of reinforcing expansive soil slopes by soilbags is illustrated.