hole shrinkage

基本解释

As a result, the short hole shrinkage method with flat bottom structure was employed to mine the stope firstly, then stoping ore pillar by medium length hole caving method.
後溝金鑛採用平底結搆淺孔畱鑛法先採鑛房，後用中深孔崩落法廻採鑛柱，經兩年多的生産實踐，取得較好的技術經濟指標。
Synopsis: This paper introduces the position and characteristics of the blow hole shrinkage in the side riser of cast steel castings and probes into the formation mechanism and its prevention.
本文介紹了鑄鋼件邊冒口氣縮紥的産生部位及特征，竝對其形成機理及防止措施進行了探討。
Short-hole shrinkage mining is an effective method for mining steep-thin veins, and it has advantages of high-efficiency and low-waste and simple technology.
淺孔畱鑛法對急傾斜薄鑛脈的鑛躰開採是一種有傚的採鑛方法，具有高傚低耗與工藝簡單等優點。