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用改装可测吸力的三轴仪，研究了宁夏膨胀上的变形性质和强度特性。试验结果表明，含水量（吸力）决定了上样的变形行为，并影响了土样的强度；随着含水量增加，土样的塑性应变量增加，强度减小。文中还研究了随吸力的变化规律及非地和上强度理论中的状态变量的选取方法。
With modified triaxial apparatus which can measure the suction force, the deformability and strength characteristics of Ningxia expansion were studied. The experimental results show that the water content (suction) determines the deformation behavior of the sample and affects the strength of soil samples. With the increase of water content, the plastic strain of soil samples increases and the strength decreases. The paper also studied the variation of suction and the selection of state variables in non-ground and upper-strength theories.