THE NEW DEVELOPMENT OF GROUND ANCHORAGE IN CHINA

In recent years,the integrated ground anchorages technologies have been developed in our country,in order to adapt to the rapid development needs of the construction projects such as civil engineering,water conservancy and hydropower,mining and building.A series of achievements have been achieved on the load transfer mechanism,design,structures and grouting process and long term performance and safety assessment of ground anchors which updated our country's integrated ground anchorage technologies,and the level of ground anchorages engineering applications has entered the ranks of the advanced countries.This is mainly manifested in the following aspects:1)Developing the high-pressure regrouting anchor and jet grouting underreamed anchor,overcoming low capacity and large creep defects of ground anchors in soft soils and complex geotechnical conditions;2)Strengthening the studies of the load transfer mechanism of ground anchorage,proposing the coefficient factor of anchor bond length having effects on the bond strength,determining the reasonable bond length of ground anchor;3)Developing and using load dispersed anchor system(SMBA) widely,with the characteristics of the uniform of bond distribution,good anti-corrosion properties and higher load bearing capacities;4)Making progress obviously in the research on the long term performance and safety assessment of ground anchorage;5)Establishing our nation's ground anchorage standard systems;6)Expanding significantly the field and scale of the ground anchorage engineering applications.