[1]许旭堂,简文彬,张少波,等.基于PhotoInfor的边坡开挖效应模型试验[J].长安大学学报(自然科学版),2019,39(03):36-44.
　XU Xu tang,JIAN Wen bin,ZHANG Shao bo,et al.Model test on slope excavation effect based on PhotoInfor[J].Journal of Chang’an University (Natural Science Edition),2019,39(03):36-44.
点击复制

基于PhotoInfor的边坡开挖效应模型试验()
分享到：

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第39卷
期数:
2019年03期
页码:
36-44
栏目:
道路工程
出版日期:
2019-05-15

文章信息/Info

Title:
Model test on slope excavation effect based on PhotoInfor
作者:
许旭堂; 简文彬; 张少波; 陈玮; 洪儒宝
(1. 福建农林大学 交通与土木工程学院，福建 福州 350108； 2. 福州大学 岩土工程与工程地质研究所，福建 福州 350108)
Author(s):
XU Xutang;  JIAN Wenbin;  ZHANG Shaobo;  CHEN Wei;  HONG Rubao
(1. College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, Fujian, China; 2. Institute of Geotechnical and Geological Engineering, Fuzhou University, Fuzhou 350108, Fujian, China)
关键词:
道路工程; 残积土; 多级边坡开挖; PhotoInfor; 地质力学模型; 预警监测
Keywords:
road engineering;  residual soil;  multi-stage slope excavation;  PhotoInfor;  geo-mechanical model;  warning monitoring
文献标志码:
A
摘要:
为了研究开挖效应对残积土坡坡体内部变形特征及边坡失稳机理的影响，以福宁（福鼎—宁德）高速公路某高路堑边坡为原型，依据相似理论设计地质力学模型所需相似材料及其合理配比，结合自制监测系统和数字照相量测技术，开展基于PhotoInfor的多级边坡开挖效应模型试验研究，分析多级开挖过程中模型边坡坡体位移及应力的变化规律。研究结果表明：开挖过程中边坡坡体变形是由缓慢至加速滑动的渐进过程，坡体中部和坡脚开挖时，坡体内部位移增长速率最快；坡体上部位移大于下部土体位移，且从坡体内部向临空面方向位移逐渐增大；边坡在开挖过程中坡体内部土体应力分布不均，坡脚处应力集中度高，边坡前端推力随着开挖过程逐渐增大；开挖卸载效应打破了边坡原有应力平衡，坡体后缘出现张拉裂隙，裂隙在整个开挖过程中不断发育、扩展和连通，形成贯通裂缝及滑动带，滑动带的形成过程与应力集中→释放→转移→重新调整造成的局部应变集中现象一致；开挖效应具有一定时效性，应力与位移变化并不同步，应变集中具有一定的滞后性，对此类边坡的早期监测，应以水平位移增长速率为控制指标，后期监测应兼顾水平位移和应力水平增长速率，两者缺一不可。该研究成果可为中国东南沿海地区多级边坡开挖的预警监测和支护加固提供重要依据。
Abstract:
The effects of deformation characteristics and slope instability mechanism on residual soil slope under the excavation effect were investigated, by using a high cutting slope of the Funing (Fuding to Ningde) Expressway as a sample, a geomechanical model using similar materials according to the similarity theory, was designed. A model test study was conducted, using a realtime monitoring system and digital photogrammetry technology on the multistage slope excavation effect based on PhotoInfor, and changes of displacement and stress during multistage excavation of model slope were analyzed. The results show that the variation in the excavated slope is a gradual process from slow deformation to accelerated sliding, the rate of displacement increases the fastest in the slope under the slope excavation at the middle and top positions, the soil displacement at the slope top position is greater than that at the lower part, and the displacement from the slope inside to the hollow face increases gradually. Further, soil stressdistribution is not uniform in the slope excavation process, the stress concentration at the foot of slope is higher, and the thrust at the front end of slope accelerates gradually during the excavation process. The original stress balance of the slope is disturbed when the excavation. A tension crack formed in the rear edge of the slope and then the crack developed, expanded, and connected continuously during the whole excavation process. Then, the crack formed through the fracture and sliding zone. The forming process of the slip zone is consistent with that of the local strain concentration caused by stress concentration, release, transfer and readjustment. Meanwhile, the excavation effect possesses a certain timeeffect, the stress and displacement change are not synchronized, and the strain concentration shows a certain hysteresis, therefore, the early monitoring of this kind of slope should be considered to choose the control index of the horizontal displacement growth rate. The stress horizontal growth rate should be consider in the post monitoring, both growth rates are indispensable. The research results provide an important basis for early warning monitoring and support reinforcement of excavated slope in the southeast coastal area of China. 3 tabs, 12 figs, 25 refs.

相似文献/References:

[1]武建民,祝伟,马士让,等.应用加权密切值法评价基质沥青抗老化性能[J].长安大学学报(自然科学版),2012,32(01):0.
[2]张宜洛,袁中山.SMA混合料结构参数的影响因素[J].长安大学学报(自然科学版),2012,32(01):0.
[3]陈璟,袁万杰,郝培文,等.微观指标对沥青热稳定性能的影响[J].长安大学学报(自然科学版),2012,32(01):0.
[4]周兴业,刘小滔,王旭东,等.基于轴载谱的沥青路面累计当量轴次换算[J].长安大学学报(自然科学版),2012,32(01):0.
[5]李祖仲,王伯禹,陈拴发,等.轴载对复合式路面应力吸收层荷载应力的影响[J].长安大学学报(自然科学版),2012,32(01):0.
[6]关博文,刘开平,陈拴发,等.水镁石纤维路面混凝土路用性能[J].长安大学学报(自然科学版),2012,32(01):0.
[7]翁效林,王玮,张留俊,等.拓宽路基荷载下管桩复合地基沉降变形模式[J].长安大学学报(自然科学版),2012,32(01):0.
[8]穆柯,王选仓,柳志军,等.基于非饱和渗流原理的路基含水率预估[J].长安大学学报(自然科学版),2012,32(01):0.
[9]李振霞,陈渊召.不同类型半刚性基层材料性能的试验与分析[J].长安大学学报(自然科学版),2012,32(01):0.
[10]马 骉,马 晋,周宇鹏.沥青混合料降温收缩断裂特性[J].长安大学学报(自然科学版),2012,32(03):1.
　MA Biao,MA Jin,ZHOU Yu-peng.Cooling shrinkage fracture characteristic of asphalt mixture[J].Journal of Chang’an University (Natural Science Edition),2012,32(03):1.

更新日期/Last Update: 2019-05-23