玄武岩纤维增强复合材料锚固边坡与无支护边坡加速度响应对比研究

中外学者对于路堑高边坡的研究主要集中在其失稳机制及数值模拟方面,而对于路堑高边坡破坏特征方面的试验研究较少,对新型玄武岩纤维增强复合材料(basalt fiber reinforced polymer, BFRP)锚固结构下路堑高边坡动力学方面的研究就更加稀缺。鉴于此,以云南省功东高速公路的大营盘(K39-K41)碎石土边坡为典型工点,开展BFRP锚索+框架结构加固边坡及无支护边坡的振动台对比试验,旨在为BFRP锚索加固高边坡的动力合理性设计提供科学依据。通过试验现象分析可得:相较于无支护侧边坡而言,BFRP锚索在高边坡的加固过程中可以有效地提高边坡的整体稳定性;无支护侧坡面加速度的峰值随着高程的增大呈现"锯齿形"形状,且在四级坡和五级坡之间可能出现潜在的滑面;有支护侧坡面加速度的峰值随着高程的增大整体上呈现逐步增大的趋势,加速度随着高程放大的效应明显存在。

Comparative Study on Acceleration Response of BFRP Anchored Slope and Unsupported Slope

Scholars at home and abroad mainly focus on the study of the failure mechanism and numerical simulation of high cutting slope, while there are few experimental studies on the failure characteristics of high cutting slope, especially on the dynamics of high cutting slope under the new BFRP anchorage structure. In view of this, this paper takes Daying Pan (K39-K41) gravel soil slope of Gongdong Expressway in Yunnan Province as a typical site, and conducts shaking table comparison tests of BFRP anchor cable+frame structure reinforcement slope and unsupported slope, in order to provide scientific basis for dynamic rationality design of BFRP anchor cable reinforcement of high slope. The conclusions are as follows: (1) Through the analysis of experimental phenomena, it can be concluded that the BFRP anchor cable can effectively improve the overall stability of the slope in the process of high slope reinforcement compared with the side slope without support. (2) The peak acceleration of unsupported side slope presents a "zigzag" shape with the increase of elevation, and there may be a potential slip surface between the fourth grade slope and the fifth grade slope. (3) The peak acceleration of slope with support increases gradually with the increase of elevation, and the effect of elevation amplification is obvious.