Abstract: The monitoring method of the vertical shaft with frozen depth of 460 meters (Most of frozen soil is expansive cohesive soil)is described. By analyzing statistics of different buried length of the frozen wall of the well and concrete block lining of temperature field, three main important rules are drawn as follows: 1. the function relationship between freezing temperature of clay, water content and different buried depth; 2. the rule between the form of different depths of frozen wall and measure of lowering temperature; 3. the development rule in different steps of concrete block lining of temperature field and some other research results. The three rules instruct the construction and monitoring of the shaft effectively so as to support new scientific gist for designing and constructing the identical well.

Key words: deep topsoil, frozen sinking, monitor, temperature field