The target strata designed to drill is deep and multiple complicated sets of layer are drilled,for example,gravel layer with its upper part easy to collapse,layer with abnormal high pressure in Anjihai Areas,wellbore diameter being shrunk in Shawan in Taxihe Areas,which brings many difficulties to drilling con- struction,Considering the features of strata above and eight difficu.

The thermal characteristics of heat storage and release of the gravel layer used in the solar collector in winter were analyzed.

However, it is difficult to use in the complicate mountain areas and the gravel layer.

Combining with engineering practice, the author briefly states infix methods in gravel at the same area.

Mr Ji pit is deep freeze,the larger diameter shaft shaft against clay,sand layer,layer of gravel to take advanced construction,and guarantee the quality and safety of the project,and achieved good economic and social benefits.

Research on PDC bit for drilling in gravel interlayer.;

Field test study of methods for supporting large-section inclined shaft in gravel layer

From consolidating similar past case studies with regards to the problems encountered during construction phase, this article is able to provide an important point of view on shield tunnel design in gravel layer.