【摘要】 根据p-y曲线与水平受荷桩的承载机理,浅层软黏土的土体强度与桩的水平承载力直接相关;理论与实践表明,只要工艺得当,真空预压法的固结沉降及强度增长效果均比较显著。因此,通过建立单桩水平承载力与不排水抗剪强度的关系,计算真空预压法提高软土抗剪强度的幅度,确定用真空预压提高桩基水平承载力的分析方法。某工程滩涂超软淤泥的不排水抗剪强度初始值为cu=6kPa,经过3个月的真空预压提高到了30kPa以上,Ф600×110的PHC单桩水平承载力从50kN提高到了100kN以上。理论与实践均证明了用真空预压法提高桩基水平承载力的有效性。更多还原

【Abstract】 According to the p-y curve method and the bearing behaviors of laterally loaded piles,it is found that the lateral bearing capacity of a pile is directly related to the strength of the shallow soft soil.Theories and practices indicate that consolidation settlement and strength increase can be significant with proper technical condition of vacuum preloading.Therefore,by means of establishing the relationship between the lateral bearing capacity of single pile and the shear strength of UU test and calculating the amplitude of soil shear strength increased by vacuum preloading,the method for improving the lateral bearing capacity of pile by vacuum preloading is determined.The initial value of shear strength of super soft soil on the tidal flat was cu=6kPa,and it was improved to more than 30kPa after three months’ vacuum preloading.The lateral bearing capacity of Ф600×110 single PHC pile was promoted from 50kN to more than 100kN.Both theory and practice verified the effectiveness of vacuum preloading method for improving the lateral bearing capacity of pile.更多还原