为保证施工顺利进行，且提高安全性，对正反导井及扩挖系统进行了多项技术改进，提高了安全系数。
The some techniques of guide shaft and expansion excavation are improved for assure the successful construction and raise the safety coefficient.
选择足够安全系数的钢丝绳、加强钢丝绳维护检查和钢丝绳疲劳程度的监测，是安全运行的重要保证。
It is important ensuring of safe running to select rope with adequate safety coefficient, to strengthen maintenance inspection and fatigue level monitoring of wire rope.
即使条块形状是变化的，该法也能够给出一致的安全系数值，而且能够保证迭代过程稳定收敛。
Even if the shape of slice is varied, the proposed new method can also give consistent values of safety factors and ensure that the iteration is stably convergent.
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