悉尼煤田水体下压煤达数亿吨。目前采煤工作已接近或正处于水体下方。现在所要解决的问题是确定可以从水体下安全采出的最大煤量。为此,有许多因素需要考虑,如上覆岩层厚度、煤层厚度、地质条件和岩层移动等。目前,英国、日本、加拿大、智利和苏联等国家正在试采或成功地采出了沿海海底下方的煤炭。另外,国外还采用了河 Coal is burned in hundreds of tons of coal under Sydney coalfield water. The current coal mining work is close to or under water. The problem to be solved now is to determine the maximum amount of coal that can be safely taken from the body of water. For this reason, there are many factors to consider, such as overlying rock thickness, coal seam thickness, geological conditions and rock movement. At present, countries such as Britain, Japan, Canada, Chile and the Soviet Union are trying out or successfully mining coal under the coastal sea floor. In addition, foreign countries also adopted the river