| 程振威,李又云,李松,张丙文,曹世江.沟谷地形高填方涵洞竖向土压力数值模拟与计算方法研究[J].,2021,61(5):506-513 |
| 沟谷地形高填方涵洞竖向土压力数值模拟与计算方法研究 |
| Numerical simulation and calculation method study of vertical earth pressure of high filling culverts in trench terrain |
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| DOI：10.7511/dllgxb202105009 |
| 中文关键词: 沟谷地形 高填方 涵洞土压力 土拱效应 数值模拟 理论公式 |
| 英文关键词: trench terrain high filling earth pressure of culverts arching effect numerical simulation theoretical formula |
| 基金项目:贵州省科技计划项目(黔科技合平台人才20195301号). |
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| 中文摘要: |
| 受地形、填料物理力学参数、结构尺寸等多种因素的影响，沟谷地形高填方涵洞受力计算较为复杂，相关理论研究尚不成熟．以某一高填方涵洞项目为依托，通过数值模拟得出：在一定条件下，涵洞两侧边坡阻碍了沟内填土的沉降，土中主应力方向发生调整，从而产生土拱效应．在数值模拟的基础上，运用小主应力拱概念，推导出了沟内黏性填土产生土拱效应时的侧压力系数与沟谷地形高填方涵洞竖向土压力理论公式．各种结果对比可见：所提公式计算结果与现场实测结果以及数值模拟结果相吻合；沟谷地形涵洞上方填土中产生土拱效应时，涵洞竖向土压力随着填土高度的增加非线性增大，增速逐渐减小． |
| 英文摘要: |
| Affected by many factors such as topography, physical and mechanical parameters of filling materials and structural size, the calculation of earth pressure for high filling culverts in trench terrain is complex, and the related theoretical research is not mature. Based on a high filling culvert project, the simulation is conducted and the results indicate that the direction of principal stress of soil changes because of slopes on both sides of culvert hampering the settlement of filling under certain conditions, which results in arching effect. Based on the modeling study, the calculation formulas of the lateral pressure coefficient and the vertical earth pressure of high filling culverts in the trench terrain when cohesive filling in ditch produces the arching effect are deduced by using the conception of the minor principal stress arch. The comparison of various results shows that the calculated results are close to the field measurement and numerical simulation results, the vertical earth pressure of culvert increases nonlinearly with the increment of filling depth when upper filling of culvert in the trench terrain produces the arching effect, and the growth rate gradually decreases. |
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