Wang Lijin, Jia Hang, Jiang Tong, Zhang Junran, Jia Yanchang, Li Longfei, Wan Li
College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China.
Zhejiang Huadong Geotechnical Investigation & Design Institute Co, Ltd, Hangzhou, 310014, China.
Sci Rep. 2024 Apr 5;14(1):7991. doi: 10.1038/s41598-024-58737-w.
In sustaining arch locked-segment-type slopes, natural soil arches play a key anti-sliding role in the slope's evolution. In this study, a self-developed model test device was used to simulate the whole process of deformation evolution of sustaining arch locked-segment-type slopes, and the formation of natural sustaining arch and its locking control effect on slope stability were studied. The test results show that the continuous formation and progressive destruction of the sustaining arch were observed. The sustaining arch formed in the second time has the best locking effect, and the anti-sliding force reaches its stress peak point. However, the slope is not in a critically unstable state, instead, the stress is continuously adjusted to form a larger range of soil arch to resist the slope thrust. Consequently, the slope destabilizes until the ultimate shear strength of arch foots is exceeded, at which point the critical arch height of the arch is reached. The critical arch height mechanical model for slope stability analysis was developed based on the soil arching effect and limit equilibrium theory. The applicability of the model was demonstrated by the physical test and Xintan slope data, which can provide some guidance for early warning of landslides.
在维持拱锁段式边坡稳定方面，天然土拱在边坡演化过程中发挥着关键的抗滑作用。本研究采用自行研制的模型试验装置，模拟维持拱锁段式边坡变形演化的全过程，研究天然维持拱的形成及其对边坡稳定性的锁控效应。试验结果表明，观测到维持拱的持续形成和渐进破坏。第二次形成的维持拱锁控效果最佳，抗滑力达到应力峰值点。然而，边坡并非处于临界失稳状态，而是应力不断调整，形成更大范围的土拱以抵抗边坡推力。因此，边坡失稳直至超过拱脚的极限抗剪强度，此时达到拱的临界拱高。基于土拱效应和极限平衡理论，建立了边坡稳定性分析的临界拱高力学模型。通过物理试验和新滩边坡数据验证了该模型的适用性，可为滑坡预警提供一定指导。
