【摘要】 随着西部陆海新通道某水运枢纽工程的推进，产生大量土石方，形成多个低压实度的大型弃土场，对区域环境安全和土地利用带来新的挑战。以广西百色那糯弃土场边坡为研究对象，开展不同土石比和不同坡度的土工离心模型试验，并结合数值模拟分析，探讨边坡变形特性。研究结果表明：1)在低压实度（85%）条件下，优化土石比是协调应力-变形平衡的关键路径，通过增加20%含石率，能有效抑制土压力增量，并提升有效位移率4.3%，使土压力-位移修正耦合比K_cp=1.82稳定于安全阈值内；2)随着含石率的增加，非均质弃土场边坡竖向位移逐渐减小，应力集中现象显著改善。40%的含石率对提高边坡稳定性效果最佳，其安全稳定系数达到1.684;3)非均质弃土场边坡的安全系数与土压力-位移修正耦合比存在强负相关性，其相关系数R=-0.98，即随着修正耦合比的减小，安全系数会有所上升，安全稳定性增强。更多还原

【Abstract】 With the advancement of a water transportation hub project in the western land sea new channel, a large amount of earthwork has been generated, forming multiple large-scale spoil sites with low pressure density, which poses new challenges to regional environmental safety and land utilization. Taking the slope of the Nanuo spoil site in Baise, Guangxi as the research object, geotechnical centrifugal model tests with different soil rock ratios and slopes were conducted, and combined with numerical simulation analysis, the deformation characteristics of the slope were explored. The research results indicate that: 1)Under low pressure compaction conditions（85%）, optimizing the soil rock ratio is the key path to coordinating stress deformation balance. By increasing the rock content by 20%, the soil pressure increment can be effectively suppressed, and the effective displacement rate can be increased by 4.3%, making the soil pressure displacement correction coupling ratioK_cp=1.82 stable within the safe threshold. 2) With the increase of rock content, the vertical displacement of the heterogeneous spoil slope gradually decreases, and the stress concentration phenomenon is significantly improved. A rock content of 40% has the best effect on improving slope stability, with a safety and stability coefficient of 1.684. 3) There is a strong negative correlation between the safety factor of heterogeneous spoil slope and the coupling ratio of soil pressure displacement correction, with a correlation coefficient ofR=-0.98. That is, as the coupling ratio of correction decreases, the safety factor will increase, and the safety stability will be enhanced.更多还原