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| Study on the influence of initial lateral in-situ stress on heave in the deep excavated red bed soft rock subgrade |
| ZHANG Rui1，2，LUO Hui1，3，YU Lei4，QIN Lingwei1，ZHANG Xiwei1，WU Gaoqiao1 |
| (1. School of Traffic and Transportation Engineering，Changsha University of Science and Technology，Changsha，Hunan 410114，China；2. State Key Laboratory of Green and Long Life Road Engineering in Extreme Environments，Changsha University of Science and Technology，Changsha，Hunan 410114，China；3. Hunan Zhonghe Geotechnical Engineering Co.，Ltd.，Changsha，Hunan 410003，China；4. China Railway Economic and Planning Research Institute，Beijing 100038，China) |
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Abstract A two-dimensional swelling system was developed in this study to investigate the effect of the lateral stress on the heave behavior of a natural red mudstone embankment under deep excavation. The heaving under a combination of stress path of vertical loading-unloading with the application of the lateral stress was examined in detail. Then，a comprehensive numerical simulation was conducted to characterize the heave of the deep-excavated embankment. Results indicates that the lateral stress is the main consequence of heaving，which accounts for 65.8% to 67.8% of the total heaving. The application of the lateral stress would result in around 1.6 to 1.9 times of the heave to the laterally unconfined case. On the other hand，the hydration-induced heaving becomes around 0.5 times to that caused by the lateral stress. Therefore，the factors affecting the heave emerge in the sequence of the lateral unloading，the magnitude of the lateral stress and the swelling induced by water immersion. The evident heaving of the embankment is seen when the lateral stress ratio is larger than 0.6. In addition，The results show that lateral in-situ stress is one of the important reasons for the heave of the red bed soft rock subgrade. The research results can provide theoretical support or reference for the treatment of the heave.
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2024, Vol. 43 
