【摘要】：為完善圓形地連墻設計理論,探討了現(xiàn)行規(guī)范方法的力學概念、環(huán)向應力計算方法、土-結構相互作用及環(huán)向剛度折減系數(shù)等關鍵問題,基于薄殼理論推導了地基雙向彈簧條件下圓形地連墻的基本微分方程,改進非線性土體彈簧模型以考慮土壓力發(fā)揮極限值所需的位移,引入連續(xù)彈簧模擬環(huán)形內襯,采用增量法計入施工過程影響,并編制了有限元程序;同時,提出采用單元體試驗研究圓形地連墻環(huán)向剛度折減系數(shù)取值方法,考慮接縫剛度與寬度、地連墻半徑、槽段平均長度等因素建立了折減系數(shù)計算公式,最后,以陽邏大橋圓形錨碇基坑工程為例進行了計算與對比分析。結果表明:典型條件下折減系數(shù)為0.467~0.679;該方法位移計算值與實測值基本吻合,克服了現(xiàn)行方法無法分析支護結構環(huán)向應力及地連墻兩側土壓力發(fā)展過程的缺陷;計算參數(shù)物理意義明確、易于獲取,可為工程設計提供較為全面的參考依據(jù)。
[Abstract]:In order to perfect the design theory of circular earth connecting wall, the key problems such as mechanical concept of current code method, calculation method of circumferential stress, soil-structure interaction and coefficient of toroidal stiffness reduction are discussed. Based on the thin shell theory, the basic differential equation of circular earth wall under the condition of bidirectional spring is derived. The nonlinear soil spring model is improved to take into account the displacement required for the earth pressure to exert its limit value, and the continuous spring is introduced to simulate the ring lining. The incremental method is used to take into account the influence of the construction process, and the finite element program is compiled. At the same time, a method for calculating the circumferential stiffness reduction coefficient of circular earth connecting wall is put forward by using the element body test, considering the joint stiffness and width, the radius of the ground connecting wall. The calculation formula of the reduction coefficient is established by the factors such as the average length of the slot section. Finally, the calculation and comparative analysis of the circular Anchorage foundation pit of Yangluo Bridge are carried out. The results show that the reduction coefficient is 0. 467 ~ 0. 679 under typical conditions, the calculated displacement value of this method is in good agreement with the measured value, which overcomes the defects of the current method which can not analyze the circumferential stress of the supporting structure and the development process of the earth pressure on both sides of the retaining wall. The physical meaning of the calculation parameters is clear and easy to obtain, which can provide a more comprehensive reference for engineering design.
【作者單位】： 長沙理工大學土木與建筑學院;廣東長大公路工程有限公司;湖南省交通規(guī)劃勘察設計院;
【基金】：國家自然科學基金項目(51478051) 交通運輸部建設科技項目(2013 318 798 320)
【分類號】：U443.1

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