This paper, based on the field investigation and the tests of rail-bed soil samples,analyses have been made about the special engineering geological environment of the railbeds and two kinds of environmental engineering geological effects which are refered to additional deformation effect and quick weathering effect.

Grouting strengthening construction for bridgehead sinking in railway roadbed;

The experimental research of post construction settlement observation of railway roadbed;

The author classify the disease types of the railway roadbed,analyze the mechanisms of each roadbed disease,introduce the detection methods of roadbed diseases,and points out that the identification of foundation problems type and their forming law and accurate test is a basis to prevent railway foundation problems and make an effective treatment.

Application of the rotary jet grouting pile in railway foundation diseases remedial engineering

An example was gave to introduce the important point of key procedure and craftwork flow on the railway foundation transitional segment.

The mechanism of ground collapse in the Karst area of covering-type induced by human activity and its countermeasures are discussed with the example of control works of the railway foundation collapse at Wafangdian.