Based on the geological conditions of the Chuanzhusi Tunnel, which passes through an ancient landslide, a site investigation found that the surrounding rock deformation and failure modes of the tunnel are mainly tunnel collapse, spalling and dropping. The three-dimensional finite element numerical simulation of the stability of surrounding rock by FLAC3D showed that the self-stability of the fractured rock mass is poor and the deformation modes are mainly of the elastic-plastic and relaxation varieties. Support with an H-beam steel framework played a positive role regarding the stability of fractured surrounding rock.%文章以川主寺隧道所处的工程地质条件为基础,通过现场调研分析了隧道围岩变形破坏形式主要为坍塌、掉块以及剥落.围岩稳定性三维有限元数值模拟结果显示,碎裂围岩自稳能力差,围岩变形以弹塑性变形、松弛变形为主；H型钢拱架支护结构对碎裂围岩稳定性起到积极的作用,并通过典型洞段现场位移监测数据分析结果得以证实.
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