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中文摘要：
通过开挖卸荷的计算原理,运用有限单元法对长大引水隧洞进行数值模拟,并结合工程实际情况分析围岩应力状态,分别计算不考虑开挖卸荷影响和考虑开挖卸荷影响的长大引水隧洞围岩断面切向应力.数值模拟结果表明,应力集中部位在洞腰附近区域,且考虑开挖卸荷的计算方法能更好地反映实际工程情况.
英文摘要：
According to the principle of excavation unloading, a case involving a long and wide diversion tunnel was numerically simulated using FEM. The stress on the surrounding rocks was analyzed by calculating the tangential stress at the cross sections, including or excluding the influence of excavation unloading. The results show that the stress is distributed mainly at the waist of the tunnel and the calculation method considering excavation unloading is better for actual situations.
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