铁道科学与工程学报
鐵道科學與工程學報
철도과학여공정학보
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
2014年
6期
58-61
,共4页
砂桩-网复合地基%2次预压%固结度%升半柯西分布%工后沉降
砂樁-網複閤地基%2次預壓%固結度%升半柯西分佈%工後沉降
사장-망복합지기%2차예압%고결도%승반가서분포%공후침강
sand piles-net composite foundation%secondary preloading%degree of consolidation%semi-cauchy distribution%settlement after construction
京沪高速铁路昆山试验段技术升级改造,时隔5a后对原有砂桩-网复合地基进行2次预压,能否满足高速铁路工后沉降控制要求成为关键问题。分析了砂桩地基固结变形规律,利用模糊数学(Fuzzy)理论的“升半柯西分布”,建立隶属度函数描述砂桩-网复合地基从固结排水到复合地基的转化程度,提出固结度表达式,并通过实测数据验证该表达式计算精度。并对考虑土体应力历史影响的e -lgp曲线法计算2次预压沉降量进行探讨,该方法可最终实现工后沉降精确估算。
京滬高速鐵路昆山試驗段技術升級改造,時隔5a後對原有砂樁-網複閤地基進行2次預壓,能否滿足高速鐵路工後沉降控製要求成為關鍵問題。分析瞭砂樁地基固結變形規律,利用模糊數學(Fuzzy)理論的“升半柯西分佈”,建立隸屬度函數描述砂樁-網複閤地基從固結排水到複閤地基的轉化程度,提齣固結度錶達式,併通過實測數據驗證該錶達式計算精度。併對攷慮土體應力歷史影響的e -lgp麯線法計算2次預壓沉降量進行探討,該方法可最終實現工後沉降精確估算。
경호고속철로곤산시험단기술승급개조,시격5a후대원유사장-망복합지기진행2차예압,능부만족고속철로공후침강공제요구성위관건문제。분석료사장지기고결변형규률,이용모호수학(Fuzzy)이론적“승반가서분포”,건립대속도함수묘술사장-망복합지기종고결배수도복합지기적전화정도,제출고결도표체식,병통과실측수거험증해표체식계산정도。병대고필토체응력역사영향적e -lgp곡선법계산2차예압침강량진행탐토,해방법가최종실현공후침강정학고산。
Due to technology upgrading of the Beijing-Shanghai high-speed railway in KunShan test section, the original sand piles-net composite foundation was performed with secondary preloading after five years'opera-tion.The key problem was whether control requirements could meet the requirements of high-speed railway set-tlement after preloading.In this paper,the deformation law of consolidation of the sand piles foundation was ana-lyzed using the theory of Fuzzy mathematics (Fuzzy)“Semi-Cauchy Distribution”,through establishing mem-bership function to describe the sand piles-net from the consolidated drained condition to the conversion degree of composite foundation.In this case,the equation of consolidation degree was proposed and the calculation pre-cision was validated through measured data.Finally,this method can achieve precise estimation of settlement af-ter construction,by considering the effect of the soil stress history with e-lgp curve method to calculate the mag-nitude of settlement after secondary preloading.