| 刘道奇,许旭堂,鲜振兴,杨枫,徐祥,李光杰,黄剑斌.降雨入渗对三维刚架桩边坡渗流稳定性的影响[J].井冈山大学自然版,2023,44(4):97-106 |
| 降雨入渗对三维刚架桩边坡渗流稳定性的影响 |
| EFFECTS OF RAINFALL INFILTRATION ON SEEPAGE STABILITY OF THREE-DIMENSIONAL RIGID FRAME PILE SLOPES |
| 投稿时间：2022-11-15 修订日期：2023-01-20 |
| DOI：10.3969/j.issn.1674-8085.2023.04.015 |
| 中文关键词: 降雨入渗 刚架桩 边坡稳定性 孔隙水压力 桩间距 |
| 英文关键词: rainfall infiltration rigid frame anti-slide pile slope stability pore water pressure pile spacing |
| 基金项目:国家自然科学基金项目(41702288)；福建省自然科学基金项目(2022J01157)；福建农林大学杰出青年科研人才计划项目(XJQ202014) |
| 作者 | 单位 | | 刘道奇 | 福建农林大学交通与土木工程学院, 福建, 福州 350108 | | 许旭堂 | 福建农林大学交通与土木工程学院, 福建, 福州 350108 | | 鲜振兴 | 福建农林大学交通与土木工程学院, 福建, 福州 350108 | | 杨枫 | 福建农林大学交通与土木工程学院, 福建, 福州 350108 | | 徐祥 | 福建农林大学交通与土木工程学院, 福建, 福州 350108 | | 李光杰 | 福建农林大学交通与土木工程学院, 福建, 福州 350108 | | 黄剑斌 | 福建农林大学交通与土木工程学院, 福建, 福州 350108 |
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| 中文摘要: |
| 开展降雨入渗对三维刚架桩边坡渗流稳定性影响的数值分析研究，考虑长时小雨及短时强降雨，从土体位移、坡体孔压及边坡稳定性演变角度，重点讨论降雨入渗条件下刚架桩边坡的合理桩间距，以期为雨水充沛的福建山区刚架桩边坡设计提供参考。结果表明：三维刚架桩边坡土体位移受降雨条件影响显著，随着降雨强度和持续时间的增加，土体水平位移和竖向位移依次增加；降雨条件下三维刚架桩边坡坡体内孔隙水压力分布具有明显的时空效应，短时强降雨条件下，坡顶孔压增幅最大，降雨强度的持续增加导致刚架桩边坡安全系数降幅也增大；桩间距对刚架桩边坡的渗流稳定性有显著影响，无降雨时边坡的安全系数随桩间距增大而减小；基于研究区降雨特点及暴雨频次呈现逐年递增现象，应将桩间距设为3倍桩宽，以充分发挥短时大雨情况下刚架桩的抗滑效果。 |
| 英文摘要: |
| Numerical analysis is carried out to study the influence of rainfall infiltration on the seepage stability of three-dimensional rigid-frame pile slopes. From the perspectives of soil displacement, slope pore pressure and slope stability evolution under long-term light rainfall and short-term heavy rainfall conditions, the reasonable pile spacing of the rigid frame pile side slope under the seepage condition is expected to provide a reference for the design of the rigid frame pile side slope in Fujian mountainous areas with abundant rain. Results show that the soil displacement of the three-dimensional rigid frame pile slope is significantly affected by the rainfall conditions, and the horizontal and vertical displacements of the soil gradually increase with the increase of rainfall intensity and duration. Rainfall infiltration has a great influence on the distribution of pore water pressure in the slope body, under short-term strong rainfall conditions, the increase in pore water pressure at the top of the slope is the largest, and the continuous increase in rainfall intensity leads to an increase in the decrease in the safety coefficient of rigid frame pile slopes. The pile spacing has a significant impact on the seepage stability of the rigid frame pile slope, and the safety factor of the slope decreases with the increase of the pile spacing when there is no rainfall. Based on the characteristics of rainfall in the study area and the increasing phenomenon of rainstorm frequency year by year, the pile spacing should be set as 3 times the pile width to give full play to the anti-sliding effect of rigid frame piles under short-term heavy rain. |
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