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湖南省重大工业技改工程——涟钢焦化专用铁路桥工程地质条件较为复杂,其地基杂填土松散,第四系残坡积层厚薄极不均匀,基岩浅部溶沟、溶槽发育,第四系孔隙水与基岩岩溶裂隙水通过导水天窗发生水力联系,因此该工程地基处理是项大型的复杂岩土工程。采用高压(20～30MPa)旋喷双液分喷法处理后,对施工的40根桩分别进行了钻孔抽芯及小应变检测结果表明,桩身完整,桩体密度、单桩与桩土复合地基的允许承载力均达到或超过设计要求,施工符合规范要求,质量可靠,建设、监理和设计方对此项地基处理工程给予了较高的评价。
Hunan Province major industrial technological transformation project - Lianyuan Iron and Steel Co., Ltd. coking railway bridge geological conditions are more complex, the foundation of miscellaneous fill loose soil, Quaternary residual thick layer of very uneven thickness, bedrock shallow groove, The Quaternary pore water and the bedrock karst fissure water are hydraulically connected through the guide skylight, so the project foundation treatment is a large and complex geotechnical project. After high-pressure (20 ~ 30MPa) spin-jet double-liquid injection was applied, the core-pulling and small-strain tests of 40 piles were carried out respectively. The results show that the pile body integrity, pile density, single pile and pile soil The allowable bearing capacity of the composite foundation meets or exceeds the design requirements. The construction meets the requirements of the code and the quality is reliable. The construction, supervision and design parties give a high evaluation of the foundation treatment project.