平推式岩质滑坡形成机理及治理措施

Formation Mechanism and Governance Measures of Translational Lithoid Landslides

平推式岩质滑坡作为一类容易被人们忽视的典型滑坡,有其特殊的成因与变形破坏特征。以广元市剑阁县坟林岩滑坡为背景,研究了缓倾岩质滑坡的特征、成因模式和变形破坏特征。归纳总结出降雨是降低滑坡体稳定性的主要因素,并对滑坡体进行了不同工况下的稳定性评价。分析认为,此类滑坡产生变形的主要因素是后缘裂隙水位抬升,裂隙水压力增加,同时裂隙水渗透在滑面上形成扬压力,滑面抗剪强度降低,最终导致滑坡整体失稳。在此基础上对不同整治措施的技术可行性及经济指标进行比较分析,提出了以排水为主,支挡为辅的治理措施。在滑坡后缘设置截、排水沟,前缘设置抗滑键进行支挡。工程实施两年来未发现任何变形,达到了治理的目的,经济效益明显。

The translational lithoid landslide as a kind of typical landslide is easy to be ignored by people;it has special cause of forma-tion and deformation characteristics. Taking the Fenlinyan landslide in Jiange County, Guangyuan City as an example, studied gently dipping lithoid landslide characteristics, genetic mode and deformation characteristics. Summed up the rainfall is main factor to reduce landslide stability, and carried out stability assessment of landslide mass under different operating modes. The analysis considered that main deforming factors of this kind landslide have trailing edge fissure water level upraising, pressure increased, simultaneously, the penetration of fissure water formed uplifting pressure on sliding face and reduced shear strength, finally caused landslide entire slope failure. On this basis carried out comparative analysis on technical feasibility and economic indicators of different governance mea-sures, put forward mainly drainage, assisted with retaining governance measures. On trailing edge has set intercepting and draining ditches, while on front edge set anti-slide ties to retain. After two years of project implementation, no any deformation happened, thus archived the objective of governance, and obvious economic benefits as well.