APPLICATION OF BORED-HOLE OCCLUDED PILE SUPPORT AND PROTECT TECHNOLOGY IN CHINA SUBWAY CONSTRUCTION

摘要

The bored-hole occluded pile support and protect technology is a new type of foundation pit support and protective technology with the characteristics of quick-speed construction, lower cost, less pollution and suitable for poor geological conditions developed in European countries in recent years. The construction of Shenzhen subway is also adopted with this technique in rich underground water, thick sand stratum and large distributed poor geological conditions. Combining with the conditions and present situation of our country, we have carried out study, design and construction by ourselves and solved a lot of difficult problems such as hole-forming, grouting and occlusion etc.. The accuracy of hole-forming has reached over 3per thousand and the technology has reached to the international advanced level.