Study on the Non-Destructive Detection Response Characteristics of Improved Soil Weakening Process under Coupled Seepage and Stress Fields

Abstract This study investigates the weakening patterns of 8% cement-mixed improved soil under coupled seepage and stress fields and identifies the non-destructive detection response characteristics of this process. Through prototype experiments, the study determines the resistivity change patterns associated with variations in stress and seepage fields and establishes the resistivity change rates corresponding to soil bearing capacity failure. The key findings are that during the shear failure process, both horizontal and vertical displacements increase, with greater displacements observed under water-immersed conditions. The resistivity shows a phased change pattern, decreasing significantly initially, fluctuating near failure, and increasing sharply after structural failure. The initial resistivity of the improved soil is 26,566 Ω·m, and the resistivity at failure is 2,200 Ω·m, with deviations of less than 5% from the prototype test values. These results provide a reliable basis for non-destructive monitoring of soil stability in practical engineering applications.