In the soft rock tunnel supporting,the reasonable support parameters are difficult to choose,to choose the appropriate supporting time is relatively difficult,makes the engineering application has great difficulties. Through the analysis of mechanism of soft rock tunnel supporting,three-dimensional finite element model is established by using numerical simulation,optimize the soft rock tunnel supporting parameters,put forward the optimized support scheme,provide theoretical guidance for soft rock tunnel design and construction.%在软岩隧道工程中，由于围岩地质条件多变，合理的支护参数难以选取，合适的支护时机也相对较难，使得工程应用有较大的困难。通过对软岩隧道支护机理的分析，运用数值模拟建立三维有限元模型，对软岩隧道支护参数进行优化，提出优化支护方案，对软岩隧道设计及施工提供理论指导。
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