| 十天高速成县段路堑边坡失稳机理分析及治理方案 |
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| 引用本文： | 安玉科,樊江,马建全.十天高速成县段路堑边坡失稳机理分析及治理方案[J].路基工程,2019,0(3):223-228. |
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| 作者姓名： | 安玉科 樊江 马建全 |
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| 作者单位： | 甘肃省交通规划勘察设计院有限责任公司,兰州,730000;西安科技大学地质与环境学院,西安,710054 |
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| 摘 要： | 针对十天高速成县段路堑边坡有挖必滑的现象，从地质条件和坡体物质结构方面进行分析，发现边坡破坏内在因素为构造、坡体物质结构和地下水渗流，诱发因素为坡脚开挖，边坡破坏力学机理是堆积层的蠕变-拉裂-蠕滑式破坏，变形破坏过程为开挖卸荷蠕变、后缘拉裂滑面贯通和蠕滑破坏。根据坡体物质成分和变形机理，分别提出综合治理方案:坡冲积粉质黏土堑坡采取坡脚支挡、坡面防护和截排水；崩坡积粉质黏土夹块石堑坡采取坡脚支挡、坡面绿化和截排水；崩积块碎石堑坡采取坡面绿化或坡面圬工防护工程和地表截排水方案。治理方案得到了工程验证。
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| 关 键 词： | 十天高速 徽-成盆地 路堑边坡 失稳机理 治理方案 |
| 收稿时间： | 2019-11-11 |
Instability Mechanism Analysis and Treatment Scheme of Cutting Slope in Chengxian Section of Shiyan-Tianshui Highway |
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| Abstract: | Aiming at the phenomenon that cut slope must slip when excavated in the Cheng County section of Shiyan-Tianshui highway, the geological conditions and material structure of slope body are analyzed, it is found that the internal factors of slope failure are structure, material structure of slope body and groundwater seepage and the inducing factors are slope foot excavation. The mechanical mechanism of slope failure is the creep-tensile crack-creep slip failure of accumulation layer and the process of deformation failure is the creep of excavation unloading, penetration of tensile crack slip surface at the back edge and creep slip failure. According to the material composition and deformation mechanism of slope body, the comprehensive treatment schemes are proposed respectively. The alluvial silty clay cut slope is supported by slope toe, slope protection and drainage. The colluvial silty clay cut slope with stone blocks is supported by slope toe, slope greening and drainage. The colluvial block gravel cut slope is provided with slope greening or slope masonry protection works and surface drainage schemes. The control scheme have been subject to engineering verification. |
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