向启安



摘 要:湖南省永顺—吉首高速公路(以下简称“永吉高速”)第11合同段K48+957~K49+112段在建设中边坡发生较大面积的顺层滑塌、块状崩塌现象,滑塌体形成巨大的岩堆塌落于已开挖路基上,导致桥梁施工与路基施工进度受阻。研究者通过工程地质勘察,查明滑坡场地地层岩性、地层结构、不良地质、水文地质条件以及滑坡范围、周界、揭露厚度等滑坡要素。同时,根据勘察结果,分析滑坡产生的原因,评价滑坡的稳定性以及滑坡的发展动向,并根据该滑坡的性质特征,对其进行稳定性定量评价,并提出了“锚固+排水+抗滑桩”的工程治理措施。
关键词:滑坡;边坡稳定性;剩余下滑力;抗滑桩
中图分类号:U418.55文献标志码:A文章编号:1003-5168(2021)08-0109-04
Analysis and Evaluation of Stability of the Landslide along
Yongshun—Jishou Highway
XIANG Qian
(Zhongxiang Mine Technical Service Center,Zhongxiang Hubei 431900)
Abstract: During the construction of K48+957~K49+112 section of contract section 11 of Yongshun—Jishou Expressway (hereinafter referred to as "Yongji expressway") in Hunan Province, a large area of bedding collapse and massive collapse occurred on the slope. The huge rock pile formed by the landslide collapsed on the excavated subgrade, which hindered the progress of bridge construction and subgrade construction. Through the engineering geological survey, the researchers found out the landslide site stratum lithology, stratum structure, adverse geological, hydrogeological conditions, landslide scope, perimeter, exposed thickness and other landslide elements. At the same time, according to the survey results, the causes of the landslide were analyzed, the stability and development trend of the landslide ere evaluated, and the stability was quantitatively evaluated according to the characteristics of the landslide, and the engineering treatment measures of "anchoring + drainage + anti slide pile" were put forward.
Keywords: landslide;slope stability;residual sliding force;anti slide pile
1 研究背景
近年来,我国高速公路建设快速发展。但是,在高速公路施工过程中出现了一系列问题,公路滑坡是严重威胁高速公路建设的问题之一,特别是在线路经过山区和丘陵地带时,滑坡问题较为严重。因此,分析评價高速公路的边坡稳定性并加强滑坡治理显得尤为重要。国内外诸多学者对公路滑坡影响因素及滑坡治理方法进行了研究。姚劲松等系统地介绍了边坡工程稳定性分析的全过程,从环境保护的角度提出了生态护坡的治理措施[1]。刘德平等对滑坡的稳定性进行了定量分析和验算,得出滑坡在非正常工况下处于变形失稳状态,并提出了短隧道、整体削方减载、锚索框架支护、抗滑桩、截排水、坡面防护等滑坡综合治理方案[2]。……