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中文摘要：
以鲁地拉水电站导流洞进出口段松散围岩稳定分析为背景,提出拟塌落拱有限元法及拟塌落拱离散化有限元法分别来模拟这一塌落机制,试图将松散介质这一塌落荷载特性与有限元法中能考虑支护结构与围岩相互作用的特点结合起来,更接近实际状态。研究结果表明：提出来的拟塌落拱离散化有限元法能够较好地模拟低地应力区浅埋松散介质地下洞室开挖的塌落机制,比较符合工程实际,对工程设计与分析有重要意义。
英文摘要：
The caving mechanism is simulated by FEM and DFEM to simulate ground arch respectively based on the inlet and outlet of the diversion tunnel of Ludila hydropower station.It is close to actual situation by combining the characteristics of caving load of loose medium and FEM which can consider the interaction of supporting structure and surrounding rock.The results show that the caving mechanism of underground cavern of loose medium with shallow overburden in lower stress area is simulated well by proposed DFEM,and it is close to practical engineering and important to the design and analysis of engineering.
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