经过几年对锚杆钻机的跟踪研究，发现锚杆钻机在围岩作业中常遇到软岩中有硬岩夹层的现象，造成施工过程经常更换钻具的问题。

After several years to jumbolter research, the hard rocks always present in the soft ones in the wall rock procedure using jumbolter, which results in changing the boring tool during the procedure.

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有软时窗约束多车场开放式车辆路径问题是在基本的车辆路径问题上增加了时间窗约束和多车场作业的一种变化形式，是一个典型的NP-难问题。

MultiDepot Open Vehicle Routing Problem with soft time windows is a variation of the Vehicle Routing Problem con- strained by multidepot and soft time windows, which is a typical NP-hard problem.

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有软时窗约束多车场开放式车辆路径问题是在基本的车辆路径问题上增加了时间窗约束和多车场作业的一种变化形式，是一个典型的NP-难问题。

MultiDepot Open Vehicle Routing Problem with soft time windows is a variation of the Vehicle Routing Problem con- strained by multidepot and soft time windows, which is a typical NP-hard problem.

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