单排微型桩加固缓倾长大裂隙土边坡的力学机制  

Mechanical Mechanism of Single Row of Micro Piles StrengtheningGently Inclined Long Fissured Soil Slope

作　　者：马鹏杰 魏凯 康静伟 芮瑞[3] 蔡正乾 夏荣基 MA Peng-jie;WEI Kai;KANG Jing-wei;RUI Rui;CAI Zheng-qian;XIA Rong-ji(Head Section Branch of China South-to-North Water Diversion Middle Route Co.,Ltd.,Nanyang 473000,China;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]中国南水北调集团中线有限公司渠首分局,南阳473000 [2]长江勘测规划设计研究有限责任公司,武汉430010 [3]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《长江科学院院报》2024年第3期178-185,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金面上项目(42272315)。

摘　　要：预制混凝土微型桩广泛应用于南水北调工程含长大裂隙膨胀土边坡抢险加固工程,研究其加固力学机制,对膨胀土边坡安全防护具有重要意义。在相似模型试验的基础上,建立含裂隙面边坡滑体及微型单排桩模型;以平行裂隙面方向施加推阻力,开展了相似模型试验及数值模拟。结果表明:微型单排桩加固表现出较好的阻滑效果,将坡体系统的抗滑力维持在较高水平,边坡抵抗破坏的韧性增加,边坡稳定性显著提高。边坡抗滑阻力随桩间距增加而减小,单根微型桩的影响范围有限,随着桩间距的增大,土拱效应逐渐减弱,当桩间距为12倍桩直径时,桩之间的相互作用可以忽略,建议桩间距取8倍桩直径;布置在边坡中部的微型桩加固效果较布置在边坡上1/3位置的微型桩加固效果更好。The widely application of precast concrete micro piles in the emergency reinforcement of expansive soil slope with long cracks in the South-to-North Water Diversion Project highlights their significance in ensuring slope safety.Studying the reinforcement mechanism is essential.Based on similar model test,a model was established to examine the interaction between the sliding mass and the micro single row pile in the slope with fracture surface.A thrust force was applied parallel to the fracture surface,and both similar model test and numerical simulation were conducted.The results demonstrated the effectiveness of preventing sliding by micro single row pile reinforcement.It maintained a high level of anti-sliding force in the slope system,increased slope toughness against failure,and significantly improved slope stability.The slope’s resistance to sliding decreased as the pile spacing increased.The influence of a single micro pile only extended over a limited range.As the pile spacing increased,the soil arching effect gradually weakened.Ignoring the interaction between piles became feasible when the pile spacing exceeded 12 times the pile diameter.It is recommended to maintain a pile spacing 8 times of the pile diameter.Moreover,the strengthening effect of micro piles arranged in the middle of the slope surpassed that of those arranged in the upper 1/3 of the slope.

关 键 词：微型桩 缓倾长大裂隙 膨胀土边坡 相似模型试验 数值模拟 

分 类 号：TU472.99[建筑科学—结构工程]