MICP加固对海上风机单桩基础静力特性的影响

Influence of MICP reinforcement on static properties of monopiles of offshore wind turbine

为研究微生物诱发方解石沉淀(MICP)加固技术对大直径单桩静力特性的影响,采用数值模拟方法分析MICP加固浅层土体后单桩基础的承载力、变形模式、内力分布等静力特性,并对不同加固范围、加固形状、加固强度进行敏感性分析。结果表明:使用MICP加固土体可以有效提升单桩承载力(最高达70%);加固不改变单桩变形模式,但桩周土体变形区域范围有所变化;加固可改善单桩内力分布;对于不同加固范围,加固深度超过1倍桩直径后对于提升承载力影响很小;加固半径超过3倍桩直径后对于提高单桩承载力作用较小;对于不同加固形状,承载力由大到小依次是圆柱状、倒锥状、正锥状。加固土体强度增加时,单桩承载力亦随之增加。

The influence of microbial induced calcite precipitation(MICP)reinforcement on the static properties of large diameter monopile was studied by the numerical model,including the bearing capacity,internal force distribution and deformation mode of mono pile,and the sensitivity of different reinforcement range,reinforcement shape and reinforcement strength was also analyzed.The results show that MICP can effectively improve the bearing capacity(up to 70%)and the internal force distribution of monopile.As for the deformation mode of monopile,it does not change,but reinforcement will change the deformation range of soil around the pile.For different reinforcement ranges,the critical reinforcement depth is one pile diameter(1 D),and the critical reinforcement radius is 3 D.For different reinforcement shapes,the bearing capacity from large to small are the cylindrical shape,the inverted cone and the positive cone.Considering economic factors,it is suggested to use the inverted cone reinforcement in engineering practices.As the strength of reinforced soil increases,the bearing capacity also increases.