Model test on slope excavation effect based on PhotoInfor(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年03期
- Page:
- 36-44
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Model test on slope excavation effect based on PhotoInfor
- Author(s):
- XU Xutang; JIAN Wenbin; ZHANG Shaobo; CHEN Wei; HONG Rubao
- (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)
- Keywords:
- road engineering; residual soil; multi-stage slope excavation; PhotoInfor; geo-mechanical model; warning monitoring
- PACS:
- -
- DOI:
- -
- 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 geomechanical model using similar materials according to the similarity theory, was designed. A model test study was conducted, using a realtime monitoring system and digital photogrammetry technology on the multistage slope excavation effect based on PhotoInfor, and changes of displacement and stress during multistage 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 stressdistribution 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 readjustment. Meanwhile, the excavation effect possesses a certain timeeffect, 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.
Last Update: 2019-05-23