sinking method造句怎么写

special shaft-sinking method

construction survey for conventional shaft sinking method

This paper analyses the piston effect problem in dellling shaft sinking method and its detriments. In the meantime, the approaches of solving the problem are proposed by the author.

conventionalshaft - sinking method

freezing shaft-sinking method

The freezing method became the preferred shaft sinking method when constructing in thick alluvium and unstable aquifer.