挖掘作业对邻近结构的稳定性造成威胁。
When digging operations pose a threat to stability of adjacent structures.
挖掘作业可能损坏地下管道或公用设施。
Also when digging operations have potential to strike underground pipelines or utilities.
同时计算出了挖掘机理论挖掘作业阻力。
Meanwhile calculate the theoretical excavation resistance of excavator.
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