松散体边坡开挖及支护前后的稳定性分析

The Analysis on Stability of Loose Deposit Slope with Excavation and Support

松散体边坡常位于高烈度地震峡谷区公路两侧,具有结构复杂、影响因素多等特点,易对山区公路的选线设计和运营造成较大的威胁,因此,采用合理的方法研究松散体边坡的稳定性具有非常重要的实用意义。结合实际工程案例,基于强度折减法,建立松散体边坡有限元模型,对其进行不同阶段开挖和有无支护的稳定性分析,结果表明:松散体边坡的稳定性与开挖高度、开挖量有关,并且预应力锚杆加固可以明显加强其整体性,提高稳定性。

Loose deposit slope is usually located to the side of highway in the high-intensity seismic valley region,which has the characteristics of complicated structure and various kinds of influencing factors,and it will cause a great threat to the design and operation of highway probably. Therefore, it is greatly important to research the stability of loose deposit slope through reasonable methods. Combined with the case of practical projects and based on strength reduction method,a finite-element model of loose deposit slope is built to analyze the stability in the different stages of excavation and support. The results shows that the stability of loose deposit slope is related to the excavation height and excavated volume. What’s more, the support with prestressed bolts can significantly enhance its integrity and improve the stability.