李永刚, 李 珠, 张善元. 矩形沟埋涵洞顶部垂直土压力[J]. 工程力学, 2008, 25(1): 155-160.
引用本文: 李永刚, 李 珠, 张善元. 矩形沟埋涵洞顶部垂直土压力[J]. 工程力学, 2008, 25(1): 155-160.
LI Yong-gang, LI Zhu, ZHANG Shan-yuan. EARTH PRESSURE ON THE TOP OF RECTANGULAR TRENCH-BURIED CULVERTS[J]. Engineering Mechanics, 2008, 25(1): 155-160.
Citation: LI Yong-gang, LI Zhu, ZHANG Shan-yuan. EARTH PRESSURE ON THE TOP OF RECTANGULAR TRENCH-BURIED CULVERTS[J]. Engineering Mechanics, 2008, 25(1): 155-160.

矩形沟埋涵洞顶部垂直土压力

EARTH PRESSURE ON THE TOP OF RECTANGULAR TRENCH-BURIED CULVERTS

  • 摘要: 在刚性涵洞和刚性地基条件下,考虑矩形沟埋涵洞胸腔土体的变形和承载作用,建立矩形沟埋涵洞土压力计算模型和计算公式,理论计算与有限元计算结果相吻合。研究表明:槽洞宽比为1时,洞顶土压力系数随填土高度的增大呈单调减小的规律;槽洞宽比大于1时,洞顶土压力系数随填土高度的增大呈先增后减的变化规律,初始等沉面高度附近有最大土压力系数。槽洞宽比、涵洞高宽比和填土内摩角增大时,土压力系数增大;填土凝聚力增大时,土压力系数减小。槽洞宽比增大使等沉面高度增大;填土高度增大使等沉面高度减小。

     

    Abstract: Under the condition of rigid culverts and rigid subgrade, the vertical earth pressure on the top of rectangular trench-buried culverts was analyzed theoretically, and a new model and formulae to evaluate the earth pressure are proposed with the consideration of the effect of soil mass beside culverts. The calculated results agree with those from finite element method. The results show that the coefficient of earth pressure decreases monotonously with the increasing depth of soil overlying culverts if trench width equals the outer width of the culverts, while the coefficient increases at first and decreases later if trench width exceeds the outer width of the culverts and the maximum coefficient appears at the depth close to the height of the plane of initial identical settlement. The coefficient increases with the growing of ratio of the trench width to the culvert width and with the increase of high-width ratio of the culverts. It also grows with the increase of the angle of internal friction of the soil. The coefficient decreases as the increasing cohesive strength of the soil. The height of the plane of identical settlement increases as the ratio of trench width to culvert width increases and decreases as the depth of soil overlying culverts increases.

     

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