Research on Drilling Techniques for By-pass Pressure Test

Abstract:

Several hole making techniques with drilling, key technologies and effects were analyzed after comparison test research for two types of by-pass pressure devices used in geotechnical survey. The technical measurements suited to by-pass pressure test with drilling of shallow clayed soils and sand formations were put out.

Key words:by-pass pressure test; drilling technology; well completion methods; Beijing area; clayed soils; sand formation