摘要
为解决传统预应力锚索在边坡支护应用中存在安全耐久性不足、加固效果有限等的问题,通过室内和现场试验研究了预应力钢锚管注浆锚索力学特性,开发了边坡复合加固方法。研究结果表明,锚索荷载-位移曲线的非线性变化特征更明显;钢锚管的加卸载刚度变化规律不一致,而锚索的加卸载刚度变化均表现为幂函数衰减的规律;钢锚管和锚索的弹性位移随荷载呈线性增长,而塑性位移随荷载呈增长幂函数变化。边坡现场工程试验结果显示,新型加固技术对于不同地质边坡均适用。对于完整地层,锚固结构受力时产生的变形较少且刚度变化不大,不可恢复变形小,边坡变形易达到稳定状态;对于破碎地层,裂隙增加了浆体渗透提高了其与岩土体的黏结强度,增加了锚固力,因而受力时变形大,刚度变化大,产生的不可恢复变形量大,相对于传统锚索支护,新型支护技术能够更好发挥不同结构间的协作。可见新加固方法可为类似工程边坡加固设计提供参考。
In order to solve the problems of insufficient safety durability and limited reinforcement effect of traditional prestressed anchor cable in the application of slope,the methods of indoor and field tests used to investigate the mechanical properties of prestressed steel anchor pipe grouting anchor cable,and the composite reinforcement method of slope was developed.The research results show that the nonlinear variation characteristics of the anchor cable load-displacement curve are more obvious.The change law of loading and unloading stiffness of steel anchor pipe is inconsistent,while the change of loading and unloading stiffness of anchor cable shows the law of power function attenuation.The elastic displacement of steel anchor pipe and anchor cable increases linearly with the load,while the plastic displacement increases with the load in a power function.The field engineering test results of high and steep slope show that the new reinforcement technology is applicable to different slopes.For the complete stratum,the deformation of the anchorage structure is less and the stiffness changes little,the irreversible deformation is small,and the slope deformation is easy to reach a stable state.For broken strata,the fracture increases the slurry permeability,improves the bond strength with the rock and soil,and increases the anchoring force.Therefore,the deformation is large,the stiffness changes greatly,and the irreversible deformation is large.Compared with the traditional anchor cable support,the new support technology can better play the cooperation between different structures.It is concluded that the new reinforcement method can provide reference for slope reinforcement design of similar projects.
作者
万军利
冯文林
WAN Jun-li;FENG Wen-lin(Railway Construction Research Institute of China Academy of Railway Sciences Group Co.,Ltd.,Beijing 100081,China;School of Civil and Environmental Engineering Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China)
出处
《科学技术与工程》
北大核心
2024年第14期6012-6021,共10页
Science Technology and Engineering
基金
云南省交通运输厅科技计划(云交科教2018-34,云交科教2018-35)
中国铁道科学研究院集团有限公司基金(2021YJ178)
国家自然科学青年基金(51304068)。
关键词
公路路基
钢锚管注浆锚索
模型试验
边坡加固
锚固机制
highway subgrade
steel anchor pipe grouting anchor cable
model test
slope reinforcement
anchoring mechanism
