Conventional method completely depend on experience formula, its error is big.
传统的方法完全靠经验公式和经验来决定动力大小，误差较大。
On the basis of referring a great deal of data, this article illuminate the deficiency of beeline depreciation break-point experience formula on double-declining balance method.
文章在参阅大量文献资料的基础上，就双倍余额递减折旧法直线折旧转换点的经验公式存在的不足进行了说明；
Aiming at the disadvantages of experience formula, the case-based SVM method for maximal deformation forecasting of surrounding rocks of tunnels is proposed.
针对经验公式方法的不足，提出基于工程实例的隧洞最大允许变形的支持向量机(SVM)自动获取方法。
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