交通荷载作用下堆积层边坡稳定性试验研究  

Experimental Study on Slope Stability of Accumulation Layer Under Traffic Load

作　　者：贾玉跃[1] 吕伟 贺可强[1] 刘俊伟[1] 崔林 于秀霞[1] JIA Yuyue;LV Wei;HE Keqiang;LIU Junwei;CUI Lin;YU Xiuxia(School of Civil Engineering,Qingdao University of Technology,Qingdao,Shandong 266520,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520

出　　处：《水利与建筑工程学报》2023年第3期65-73,共9页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金(42277135);国家自然科学基金联合基金重点项目(U2006225);山东省优秀青年人才基金(ZR2021YQ31);山东省海外高层次人才工作站。

摘　　要：为探究交通荷载下堆积层边坡的破坏模式及抗滑桩的加固效果,通过室内相似试验,开展有抗滑桩和无抗滑桩两组堆积层边坡模型试验,研究了坡体表面不同位置处的加速度响应和坡体内部的动土压力响应以及抗滑桩桩身的弯矩响应规律,并结合DIC技术,研究了交通荷载施加过程中坡面的应变场和运动场情况。试验结果表明:交通荷载作用下,无抗滑桩支护的堆积层边坡堆积体动力响应存在趋高趋表效应,坡顶位置响应最为强烈,因此靠近坡顶位置应作为重点防护位置;堆积层边坡上部最先出现应变集中区域,裂缝形态呈“局部单一”特征,破坏时边坡表面出现张裂和崩塌,裂缝表现出“交错溃散”的特征;抗滑桩支护后堆积层边坡稳定性明显提升,边坡整体性增加,边坡的动态响应更易传递;动力荷载的幅值会影响土压力与加速度的相应幅值,呈正相关,与动力荷载加载点的距离呈负相关。To explore the failure modes of slopes consisting of accumulation layers under traffic loads and the reinforcement effect of anti-slip piles,two groups of accumulation layer slope model tests were conducted,one with anti-slip piles and the other without,through indoor similarity experiments.The acceleration response at different positions on the slope surface,the earth moving pressure response inside the slope,and the bending moment response of the anti-slip pile body were studied.The Digital Image Correlation(DIC)technology was used to analyze the strain field and motion field of the slope during the application of traffic loads.The test results show that,under traffic loads,the dynamic response of the accumulation body slope without anti-slip pile support exhibits a surface effect with a tendency for higher response at the surface.Therefore,the position near the top of the slope should be used as a key protection position.The upper part of the slope of the accumulation layer first exhibits a strain concentration area,and the fracture morphology is characterized by"local single".When the slope fails,tensile and collapse occur on the slope surface,and the cracks show the characteristics of"staggered collapse".After anti-slip pile support,the stability of the accumulation layer slope is significantly improved,the integrity of the slope is increased,and the dynamic response of the slope is easier to transmit.The amplitude of the dynamic load affects the corresponding amplitude of the earth pressure and acceleration,which is positively correlated and negatively correlated with the distance from the dynamic loading point.

关 键 词：交通荷载 抗滑桩 数字图像相关(DIC)技术 动力响应 边坡稳定 

分 类 号：TU473.1[建筑科学—结构工程]