充分利用竖井地理、地质等周边施工条件，采用反导井法进行竖井施工。
The new method takes full advantage of surrounding construction conditions such as the geography and geologic condition of shaft and adopts reverse guide shaft to construct shaft.
详细介绍了燕山水库电站反导井爆破开挖所采用的施工方案选择，钻爆设计及施工工艺等。
The implementation scheme, blasting design and technology which were applied to excavate the inverse-induced shaft of Yanshan Reservior Power Station are introduced in detail.
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.
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.
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