径向振动激励作用下饱和砂层中浆液扩散特性试验研究  

Experimental research on slurry diffusion characteristics in saturated sand under radial vibration

作　　者：李晓龙[1,2] 陈永利 肖伟帆 范新健 钟燕辉 王复明[1,2] LI Xiaolong;CHEN Yongli;XIAO Weifan;FAN Xinjian;ZHONG Yanhui;WANG Fuming(School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,China;National&Local Engineering Laboratory of Major Infrastructure Detection and Rehabilitation Technology,Zhengzhou 450001,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

出　　处：《铁道科学与工程学报》2025年第3期1087-1099,共13页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52178401);河南高校科技创新团队支持计划(23IRTSTHN014);中原英才计划(234200510014);河南省2021年水利科技攻关项目(2021-72)。

摘　　要：振动注浆通过对饱和砂层施加振动激励作用,使其受扰动后有效应力下降、强度降低,从而减小浆液扩散阻力,增强其扩散性能,提升注浆效率和加固效果。目前振动注浆试验多采取轴向振动方式,其振动能量集中作用于钻杆端部土体,对径向土体几乎无扰动效应,影响范围有限。针对该问题,研发了一种具有径向激振和频率可调功能的振动注浆模型试验装置,杆体末端的振动器通过隔振接头与杆体连接,以减少振动能量沿杆体的传播,提升能量利用率。首先利用该装置研究了10、30和50Hz径向振动作用下,饱和砂土超孔隙水压力演变规律和时空分布特征,然后进行振动注浆试验,测试不同振动频率、注浆压力和注浆时间条件下地聚物浆液在饱和砂土中的扩散特性。结果表明,随着振动频率的增加,超静孔压比越大,达到液化状态越早,且持续时间越长,不同埋深下与振动器中心等高的测点扰动效应最强烈,在水平方向随着与振动中心距离的增加,扰动影响逐渐减弱。与静态注浆相比,施加振动激励后浆液扩散性能显著增强,浆液扩散半径随振动频率、注浆压力、注浆时间增加而增大,振动频率为10、30和50Hz时,浆液扩散半径相对于无振动时分别增加15.7%、60.2%和174.1%。不同工况下浆液固结体长度较为接近,平均长度比振动器长度增大约20%。浆液扩散的最终形态与砂土受扰动程度和空间分布特征基本一致。Vibratory grouting can reduce the effective stress and strength of the saturated sand layer after being disturbed by vibration excitation,thus reducing the diffusion resistance of grout,enhancing its diffusion performance,improving the grouting efficiency,and strengthening effect.In current vibratory grouting experiments,the prevailing approach was to use axial vibration,where the vibratory energy was focused on the soil at the end of the drill rod,with minimal disturbance to the soil in radial directions,thereby constraining the area of impact.To address this issue,the vibration grouting model test device with radial excitation and adjustable frequency function was developed.The vibrator at the end of the rod was connected to the rod through the vibration isolation joint to reduce the propagation of vibration energy along the rod and enhance energy utilization efficiency.Firstly,the evolution law and spatial-temporal distribution characteristics of excess pore water pressure of saturated sand under the action of 10 Hz,30 Hz,and 50 Hz radial vibration were investigated using this system.Subsequently,the vibration grouting test was conducted.The diffusion characteristics of grout in saturated sand under varying vibration frequencies,grouting pressures,and grouting time were tested.The findings indicate that as the vibration frequency increases,the ratio of excess pore pressure becomes larger,resulting in an earlier onset of liquefaction and a longer duration.The disturbance effect at the measuring point,which is at the same height as the center of the vibrator,is the strongest across different burial depths.As the distance from the center of vibration increases,the impact of the disturbance decreases in the horizontal direction.The grout diffusion performance is markedly improved following vibration excitation,in contrast to static grouting.Furthermore,the radius of slurry diffusion increases with increasing vibration frequency,grouting pressure,and the duration of the grouting process.The radius of slurry spreadi

关 键 词：振动注浆 模型试验 径向振动 饱和砂层 扩散性能 

分 类 号：TU17[建筑科学—建筑理论]