三峡二、三期工程混凝土所用人工砂石料由下岸溪料场生产 ,人工砂和人工碎石分别经弱风化带下部岩石和微新岩石做料源。料场开采按自上而下层开采的方式作业 ,爆破作业使用了乳化炸药混装车技术 ;并利用微机计算开挖方量 ,大大减少了绘图、描图和计算的工作量。 The artificial gravel used in the concrete works of the second and third phases of the Three Gorges Project is produced in the Xiaoxi Stream yard. The artificial sand and artificial gravel are respectively sourced through the rocks and micro-new rocks under the weathered belt. The material yard was operated by means of mining from the top to the bottom and the blasting operation was carried out using the technology of emulsion explosives mixing truck. The amount of excavation by computer was calculated, which greatly reduced the workload of drawing, tracing and calculation.