【摘要】：基于圓孔擴孔理論,考慮擠密砂樁擠密過程中砂樁本身的擠密體積變化,建立了砂樁樁身壓縮模量的計算方法。采用Mohr-Coulomb屈服準則計算樁周土屈服區(qū)范圍,同時結合樁間土的e-p曲線壓縮理論,提出了基于擴孔理論的樁周土平均壓縮模量計算公式,從而提出了考慮埋深影響的分層樁土應力比計算方法。結合越南河內(nèi)-海防高速公路實際工程進行了計算分析,隨著套管直徑增大(0.5~0.6 m),擠密砂樁和樁周土的壓縮模量都變小,但平均樁土應力比增大,從2.56增大至2.72,這符合《復合地基技術規(guī)范》中對于無實測資料時,樁間土強度低時樁土應力比取大值,樁間土強度高時取小值的規(guī)定。樁土應力比理論計算結果處于規(guī)范建議取值2~3之間。說明理論方法合理可靠,從而提高了擠密砂樁設計的科學性。
[Abstract]:Based on the theory of circular hole expansion and considering the change of compaction volume of sand pile during compaction, the calculation method of compression modulus of sand pile body is established. The Mohr-Coulomb yield criterion is used to calculate the yield zone of the soil around the pile, and combining with the e-p curve compression theory of the soil between piles, a formula for calculating the average compressive modulus of the soil around the pile based on the theory of hole expansion is proposed. A method for calculating the stress ratio of layered pile to soil considering the influence of buried depth is put forward. Combined with the actual project of Hanne-Haiphong Expressway in Vietnam, calculation and analysis are made. With the increase of casing diameter (0.5 ~ 0.6 m), the compression modulus of compacted sand pile and surrounding soil becomes smaller, but the average pile-soil stress ratio increases. The increase from 2.56 to 2.72 is in accordance with the stipulation that the stress ratio of pile to soil is large when the strength of soil between piles is low and the strength of soil between piles is small when there is no measured data in Technical Specification for Composite Foundation. The theoretical calculation results of pile-soil stress ratio are between 2 ~ 3 and 2 ~ 3 recommended in the code. The theoretical method is reasonable and reliable, and the design of compacted sand pile is more scientific.
【作者單位】： 河海大學巖土力學與堤壩工程教育部重點實驗室;河海大學土木與交通學院;
【基金】：江蘇省自然科學基金面上項目(No.BK20141419) 國家博士后基金(No.2015M571656) 浙江省交通運輸廳科技計劃重點項目(No.2015J09) 中央高�；究蒲袠I(yè)務費專項資金(No.2015B25914) 廣東省交通運輸廳科技支撐項目(No.201302023)~~
【分類號】：TU432;TU473.1

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1 馬海龍;陳云敏;;水泥土樁樁土應力分擔及曲線形式研究[J];巖石力學與工程學報;2006年S2期

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本文編號：2220108