前言煤炭是我国国民经济发展的重要能源之一,随着国民经济的迅速发展更显示出重要地位。华主席为首的党中央向我们发出了高速度发展煤炭工业的伟大号召,煤炭工业在老矿改造革新、挖潜翻番的同时将有大批新井开工兴建,这些井筒又大部座落在深厚的冲积层中,如表(1) Preface Coal is one of the important energy sources for the development of our national economy. With the rapid development of the national economy, coal has also shown an important position. The CPC Central Committee led by Chairman Hua led us to send us a great call for a high-speed development of the coal industry. While the coal industry is going to rebuild old mines and double their potential, a large number of new wells will be under construction. Most of these shafts are located in the deep alluvium In the table (1)