Based on the earthquake acceleration records at deep alluvium sites and rock sites in the Western United States,the attenuation laws of peak ground acceleration at deep alluvium sites and rock sites are obtained respectively,and amplification effects of deep alluvium sites are discussed.

Since the beginning of the 21st century,the technique of boring in the deep and thick alluvium has rapidly developed.

Juye mining area is a deep and thick alluvium mining area exploited by our country.

Study on the thickness of frozen wall in deep alluvium;

Experimental study on failure mechanism of high strength reinforced concrete shaft lining in deep alluvium;

The security of freezing wall is the key problem of freezing shaft sinking in deep alluvium.

Research on freezing pressure in deep thick alluvium is in great need with the increase in depth of frozen shaft.

The paper makes the finite element numerical simulation for the freezing wall temperature field about the deep thick alluvium combining to freezen soil's heat physical property and the main factors that influence freezing temperature field on the base of present theory of the shaft freezing temperature field.

Since the application of the freezing shaft sinking technology in China up to the early of this century, it is the first deep thick alluvium mine freezing shaft with the thickness of the alluvium over 400 m.

Shaft sinking in thick alluvium (especially thicker than 500 m) was a big problem, and there were no successful experiences both in theory and practice.