反倾岩质边坡破坏机理模型试验研究
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摘要
通过室内物理力学模型试验研究发现,对于反倾边坡,其主要的变形破坏形式为倾倒变形折断破坏,破坏首先发生在坡顶;通过试验研究反倾岩层的层面剪切强度(c,?值)、岩层厚度及岩层倾角对反倾边坡变形的影响发现,反倾岩层的层面强度(c,?值)和岩层厚度是影响边坡稳定性的重要因素,而岩层倾角对反倾边坡的变形影响不大。对试验结果进行分析,显示此类边坡的变形破坏过程具有明显的“叠合悬臂梁”的特征,并得出反倾岩质边坡的抗倾覆能力随着反倾岩层的层面强度(c,?值)、岩层厚度及岩层倾角的增大而增大的结论,与工程实际比较吻合。
Based on the example of a certain slope in Guangdong segment of Beijing?Zhuhai Expressway,several groups of physical model tests are performed;and the factors affecting the stability of slope are analyzed.The testing results show that the main failure mode of counter-tilt slopes is a toppling one,which appears first on the top of the slope.The stability of counter-tilt slopes does not rest on terrane obliquity but on strength and thickness of terrane interface.It is also indicated that the failure characteristic of this kind of slope is similar to that of superposition cantilever;and the anti-toppling capability of counter-tilt slope increases with the increases of the parameters such as the parameters of interface(c,?),thickness,and obliquity of terrane.
Based on the example of a certain slope in Guangdong segment of Beijing?Zhuhai Expressway,several groups of physical model tests are performed;and the factors affecting the stability of slope are analyzed.The testing results show that the main failure mode of counter-tilt slopes is a toppling one,which appears first on the top of the slope.The stability of counter-tilt slopes does not rest on terrane obliquity but on strength and thickness of terrane interface.It is also indicated that the failure characteristic of this kind of slope is similar to that of superposition cantilever;and the anti-toppling capability of counter-tilt slope increases with the increases of the parameters such as the parameters of interface(c,?),thickness,and obliquity of terrane.
引文
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