To study the evolution of pore structure in red clay during triaxial shear, nuclear magnetic resonance tests were performed on soil samples to determine their pore characteristics after undergoing different shear strains during triaxial consolidated undrained shear tests under different confining pressures. The results showed that the effects of confining pressure and shear on the intragranular pores of the soil samples were minimal. In contrast, during consolidation and triaxial shear, interparticle macropores in the soil sample were compressed. Generally, the greater the confining pressure during the test, the faster the soil structure stabilized. Once the axial strain exceeded 8%, the soil structure also stabilized, and both deviatoric stress and pore diameter remained unchanged. Evolution of the pore characteristics during triaxial shear revealed that their shear deformation history determined the new microstructure of the saturated compacted red clay.

为了研究红粘土在三轴剪切过程中孔隙结构的演变，在不同围压下的三轴固结不排水剪切试验中，对土样进行了核磁共振试验，以确定它们在经受不同剪切应变后的孔隙特征。结果表明，围压和剪力对土样粒内孔隙的影响很小。相比之下，在固结和三轴剪切过程中，土壤样品中的颗粒间大孔被压缩。一般来说，试验时围压越大，土体结构稳定得越快。一旦轴向应变超过8%，土体结构也趋于稳定，偏应力和孔径均保持不变。