长江三峡永久船闸一期开挖爆破实践

三峡水利枢纽永久船闸一期开挖工程量达１８００万ｍ３，合同工期为１８个月，平均月强度达１００万ｍ３；岩性为古老的前震旦纪闪云斜长花岗岩，构造裂隙发育，地质条件较复杂；设计开挖深度为９０ｍ，对安全稳定要求高，施工强度相当大。在工程实践中采用全套大型液压机械设备，混装车乳化浆状炸药塑料导爆管雷管大区接力微差起爆及光面爆破、预裂爆破等施工技术，取得了较好的效果，提前８天完成一期开挖任务。

EXCAVATION AND BLASTING PRACTICE IN THE FIRST PHASE OF PERMANENI SHIP LOCK IN THE THREE GORGES PROJECT

In the first phase, the total volume of rock excavation of permanent shiplock in the Three Gorges Project amounts to 18 million m3,1 million m3 in average for each month. The contracted construction duration is 18 months. The rock is amphibole-micaplagioclase-granite in pre-sinian period.Structural cracks in rock mass is grown seriously,and the rock geological condition is complex, while the desired slope stability is strict. In the rock excavation,huge hydraulic mechanical equipments,explosive mixed trucks, methods of smooth blasting, presplit blasting and delay blasting which are fired in series within a large area,a better effect is obtained, and the excavation time has been shorted for 8 days.