The unfavorable geographical conditions such as high water level,sludge and shifting sands,hard piling down to the underground rock will have a strong impact on the normal construction of the manual-excavated pile.

The geologic condition of the bearing layer was probed with GPR to ensure the safety and high quality of pile foundation construction.

Combined with foundation pit supporting engineering of coal transport system in one power plant the geological conditions of underground passageway are discussed.

It introduces the red clay,points out the red clay foundation is one good foundation in the civil construction project,and brings forward the corresponding measures solving the problems in the geological conditions of crack,ground burrow and clint in the red clay foundation projects,which will supply reference to the red clay foundation projects.

Discussion was made with engineering cases on how to choose pile-driving machine in large diameter bored cast-in-place pile construction in different geological conditions,so as to increase construction efficiency.

According to the unfavorable geological conditions in Wuqiaoling, from landslide, dangerous rock and other aspects the difficulties in expanding planning caused by geological issues are analyzed; at the same time corresponding treatment measures are proposed according to the anticipated environmental geological problems in double line engineering.

The paper summarizes the engineering geologic and hydrogeologic condition along the Shanghai Chongming Tunnel and analyses the unfavorable geological condition and its solution in the site.

The unfavorable geological conditions around and in front of the working face in tunnel engineering will cause collapse of tunnel and surge of underground water resulting in tremendous causalities and equipment damage.