新型高聚物微型桩加固工程斜坡的抗滑性能模型试验研究  

Study on anti-sliding performance of engineering slope reinforced by new polymer micropile based on model test

作　　者：王钰轲 尚海威 贾朝军 余翔 钟燕辉[1,2,3] WANG Yuke;SHANG Haiwei;JIA Chaojun;YU Xiang;ZHONG Yanhui(School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China;National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology,Zhengzhou 450001,China;Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety,Zhengzhou 450001,China;School of Civil Engineering,Central South University,Changsha,410075,China)

机构地区：[1]郑州大学水利与交通学院,河南郑州450001 [2]重大基础设施检测修复技术国家地方联合工程实验室,河南郑州450001 [3]水利与交通基础设施安全防护河南省协同创新中心,河南郑州450001 [4]中南大学土木工程学院,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2024年第10期3803-3813,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52178369,52109140);河南省自然科学基金优秀青年基金资助项目(232300421069);中原科技创新领军人才项目(234200510014)。

摘　　要：基于高聚物材料成型快、力学性能优异与微型桩施工非开挖、扰动小、场地适应性强的特点,提出一种用于工程斜坡突发滑坡灾害防治加固的新型高聚物微型桩技术。通过自主设计的工程斜坡加固模型试验装置,开展不同设计方案下高聚物微型桩加固效果试验,分析高聚物微型桩的抗滑性能、加固机理、桩体破坏形式与受力变形特征。研究结果表明:高聚物微型桩成型快,具有优异的强度性能,能够有效提高滑坡体的承载能力。在滑坡推力的作用下,桩身呈现出“S”型变形,变形区域主要集中在滑面附近,桩体会发生一定程度的偏转。不同埋深处桩体的剪力与弯矩沿滑面整体呈对称三角形分布,靠近滑面附近的剪力与弯矩最大。在无筋和加筋2种方案下,滑坡体所能承受的极限荷载分别为35 kPa和50 kPa,桩体偏转角度分别为2°和1°,加筋后,桩体承受的最大剪应力约为无筋桩体的1.55倍,其最大弯矩约为无筋桩体的2.75倍。Based on the characteristics of fast forming and excellent mechanical properties of polymer materials,and the non-excavation,low disturbance,and strong site adaptability of micropile construction,a new type of polymer micropile technology for the prevention and reinforcement of sudden landslide disasters in engineering slopes was proposed.Through the self-designed engineering slope reinforcement model test device,the reinforcement effect test of polymer micropile with different design schemes was carried out.The anti-sliding performance,reinforcement mechanism,pile failure mode and stress deformation characteristics of polymer micropile were analyzed.The results show that the polymer micropile has fast forming velocity,excellent strength performance and can effectively improve the bearing capacity of the landslide.Under the action of landslide thrust,the pile body shows"S"type deformation,the deformation area is mainly concentrated near the sliding surface,and the pile will deflect to a certain extent.The shear force and bending moment of the pile at different buried depths are symmetrically triangularly distributed along the sliding surface,and the maximum value occurs near the sliding surface.In the two design schemes of no reinforcement and reinforcement,the ultimate load that the landslide can bear is 35 kPa and 50 kPa respectively,the deflection angles of the pile is 2°and 1°respectively.The maximum shear stress and the maximum bending moment of the reinforced pile body are 1.55 times and 2.75 times as many as that of unreinforced piles,respectively.

关 键 词：高聚物微型桩 抗滑性能 工程斜坡 模型试验 变形破坏机制 

分 类 号：U213.15[交通运输工程—道路与铁道工程]