沿海地下水影响较大的复杂区域软基处理水泥掺量与施工工艺创新实践

The cement content and construction technology innovation practice of soft foundation treatment in complex area with great influence of coastal groundwater

福清龙江沿岸河漫滩地处海口镇龙江出海口,该区域地表水和海水丰富,潮汐影响较大,地下多为淤泥质土和残积砂质黏性土,地质情况极其复杂。因此采用水泥土搅拌桩作为软土路基加固处理,通过水泥浆液与地基以下淤泥质土搅拌,使其变成具有一定强度的坚固路基。为使其作用发挥到最优,本文研究改进水泥掺量及施工工艺,提升土体加固效果,提高抗渗性能,缓解水泥搅拌桩的浆液流失,使地基承载力满足设计要求而且工程造价最低,此工艺可为沿海地下水影响较大的复杂区域道路软基处理施工提供参考。

The floodplain along the Longjiang River in Fuqing is located at the mouth of the Longjiang River in Haikou Town.The surface water and sea water are abundant in this area,and the tidal influence is great.The underground is mostly silt soil and residual sandy clay soil,and the geological situation is extremely complex.Therefore,the cement-soil mixing pile is used as the soft soil subgrade reinforcement treatment,and the cement slurry is mixed with the silt soil below the foundation,so that it becomes a solid subgrade with a certain strength.To optimize its role,the method to improve the cement content and construction process was studied,to improve the soil reinforcement effect,improve the permeability resistance,alleviate the slurry erosion of cement mixing piles.The foundation bearing capacity can satisfy the design requirements and construction cost was minimized.The process and parameters can provide guidance for complex region soft ground treatment which was great influenced by the groundwater in the coastal road construction.