The reinforcement effect of quick-setting polymer micro anti-slide piles on sand slope
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 1, Pages: 119-132(2024)
- 作者机构：
1.福建省地质工程勘察院 自然资源部丘陵山地地质灾害防治重点实验室，福建 福州 350002
2.自然资源部东南生态脆弱区监测修复工程技术创新中心，福建 福州 350001
3.西北大学 地质学系/大陆动力学国家重点实验室/西安市黄土动力灾害防控与地质环境修复重点实验室，陕西 西安 710069
- 作者简介：
- 基金信息：
DOI：10.16152/j.cnki.xdxbzr.2024-01-014
CLC：
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TANG Xuefeng, XIE Wanli. The reinforcement effect of quick-setting polymer micro anti-slide piles on sand slope. [J]. Journal of Northwest University (Natural Science Edition) 54(1):119-132(2024)
TANG Xuefeng, XIE Wanli. The reinforcement effect of quick-setting polymer micro anti-slide piles on sand slope. [J]. Journal of Northwest University (Natural Science Edition) 54(1):119-132(2024) DOI： 10.16152/j.cnki.xdxbzr.2024-01-014.
摘要
针对常规混凝土凝固较慢、工期长、施工复杂等缺陷，提出速凝高聚物微型抗滑桩加固边坡的新思路，开展高聚物微型抗滑桩加固砂土边坡的模型试验与数值模拟研究。结果表明，在数值模拟中，将Mohr-Coulomb强度参数转换为Drucker-Prager强度参数时，应力洛德角取0能够更准确地反映边坡岩土体的强度特征；模拟得到的各边坡工况的位移、变形发展过程和破坏特征都与试验结果较为吻合，在一定程度上验证了数值模拟的准确性；在施加了5级水平推力(1 500 N)后，单排高聚物微型抗滑桩加固后的坡脚、坡中和坡顶的实测位移分别比加固前减小了33.4%、33.3%和33.3%，而双排桩加固后的坡脚、坡中和坡顶的实测位移分别比加固前减小了55.9%、53.4%和43.4%。加固前的坡面呈现波浪状的变形特征，加固后的坡体变形显著改善。在水平推力达到1 800 N时，单排桩工况中的桩体断裂，而当水平推力达到2 400 N时，双排桩工况中的后排桩首先发生断裂。研究结果验证了速凝高聚物微型抗滑桩在边坡加固中具有一定有效性和可行性。
Abstract
In view of the defects of conventional concrete such as slow setting, long construction period and complex construction, the new idea of slope reinforcement by quick-setting polymer micro anti-slide piles is put forward, and model tests and numerical simulation of sand slope reinforced by quick-setting polymer micro anti-slide piles are carried out. The results show that when the Mohr-Coulomb strength parameter is converted to Drucker-Prager strength parameter in numerical simulation, the value of the Lode angle is set to 0, which can reflect the strength characteristics of the slope soil more accurately. The displacement, deformation development and failure characteristics of the slope under different conditions obtained by numerical simulation are in good agreement with the experimental results, which verifies the accuracy of the numerical simulation to a certain extent. After the 5,th, level of horizontal thrust (1 500 N), the measured displacement of the slope foot, slope middle and slope top reinforced by a single row of polymer micro anti-slide piles decreased by 33.4%, 33.3% and 33.3%, respectively, compared with that before reinforcement, while the measured displacements of the slope foot, slope middle and slope top reinforced by double-row piles decreased by 55.9%, 53.4% and 43.4%, respectively. Before reinforcement, the slope surface showed wavy deformation characteristics, and the deformation was significantly improved after reinforcement. The pile body in single-row pile condition breaks when the horizontal thrust reaches 1 800 N, while the back pile in double-row pile condition breaks first when the horizontal thrust reaches 2 400 N. The conclusion of the study verifies the effectiveness and feasibility of fast-setting polymer micro anti-slide piles in slope reinforcement.
关键词
速凝高聚物抗滑桩砂土边坡加固效果模型试验数值模拟
Keywords
quick-setting polymermicro anti-slide pilesand slopereinforcement effectmodel testnumerical simulation
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