摘要
三峡库区云阳新县城高边坡的主要破坏形式有坡面剥落、滑移式崩塌和岩块坠落。未支护的高边坡变形破坏的主要控制因素包括软、硬相间的斜坡岩体组成结构,软弱泥化夹层,含膨胀性矿物及区域性构造裂隙和卸荷裂隙。利用RFPA软件模拟了高边坡在不支护条件下变形破坏的发展趋势。
A number of cut slopes have been left behind during the construction of the new resettlement town of the Yunyang County in the Three Gorges Reservoir region. Remedial measures have not been implemented for some of the slopes so far and caused deformation and failure. The paper presents several cases of instability of the slopes,with an emphasis was placed on the slope failure mechanisms and slope development tendency. It is shown that gradual surface scaling,sliding collapse,and block falling are the prevailing failure phenomena of the cut slopes. Rocks with abundant expansive minerals,strong sandstone interbedded with soft claystone, and regional structural joins coupled with stress-release fracturing are the controlling factors inducing the cut slope failure. To understand the deformational behavior of cut slopes under excavation and to examine their development tendency under nature （no remedies are implemented）, finite-element simulation is conducted to a case of the cut slopes. RFPA program developed by CRISR of the Northeastern University of China is applied in this simulation. Results indicate that ①stress-release rebound on surfaces of slope is the predominant performance at their initial stages after excavation,while local failures may occur;②slope deformation develops towards deeper and severe slope failure is expected if no remedies are carried out; ③pre-existing structural joints play an important role in instability of cut slopes.
出处
《地质科技情报》
CAS
CSCD
北大核心
2005年第B07期160-164,共5页
Geological Science and Technology Information
基金
三峡库区第二期地质灾害防治项目"三峡库区巴东组斜坡变形特性与机理研究"
关键词
高边坡
有限元模拟
变形
破坏
三峡工程
云阳新县城
cut slope
finite-element simulation
deformation
failure
Three Gorges Reservoir
new county town of Yunyang
