CAJ | 학술논문

在深厚软土地区进行打桩施工时,土体中会产生较大的超孔隙水压力（简称＂超孔压＂）。通过杭甬铁路客运专线上虞北站路基下预应力管桩沉桩过程中的孔隙水压力监测试验,探讨了深厚软土地区群桩施工过程中产生的超孔压的累积及其消散规律。研究认为群桩施工对超孔压的影响范围为27.5倍桩径,且超孔压在水平和深度方向上的分布规律受土层分布的影响较为明显。通过实测与理论计算的对比,分析了各种理论的差异,可供类似地质条件下预应力管桩的施工组织借鉴。
재심후연토지구진행타장시공시,토체중회산생교대적초공극수압력（간칭＂초공압＂）。통과항용철로객운전선상우북참로기하예응력관장침장과정중적공극수압력감측시험,탐토료심후연토지구군장시공과정중산생적초공압적루적급기소산규률。연구인위군장시공대초공압적영향범위위27.5배장경,차초공압재수평화심도방향상적분포규률수토층분포적영향교위명현。통과실측여이론계산적대비,분석료각충이론적차이,가공유사지질조건하예응력관장적시공조직차감。
In deep soft soil areas,higher excess pore water pressure would be induced by hammering method to install the pre-stressed pipe pile.Based on the in-situ monitoring test of pore water pressure during the process of pre-stressed pipe piles were driven which were used to improve foundation soil at Shangyu North Station of Hangzhou-Ningbo Passenger Railway,the development trend of accumulation and dissipation of excess pore water pressure during the pile groups were driven into stratified soil in deep soft ground.The results indicate that the influence area of excess pore water pressure caused by driving pile group was spread to 27.5 times of the pile diameter,and the distribution form of excess pore water pressure both at horizontal and vertical were affected obviously by the distribution of soil strata.Also,based on comparison analysis between tested results and calculated results,the difference among various theoretical approach was discussed,which can provide reference to construction organization of the pre-stressed pipe pile at similar geological conditions.