G217 国道南段沿线典型危岩体的稳定性分析摘 要:G217 国道横贯天山南北,沿线地质环境特别,生态条件恶劣,地形地貌差异较大,倒塌、滑坡等地质灾害频发,其中尤以倒塌灾害最为严重。据现场调查,目前仍存在多处危岩体,严重威胁行车安全。本文从危岩体潜在失稳方式的角度对沿线危岩体进行了分类讨论,对典型危岩体用 DDA 数值模型分析方法讨论其失稳方式的形成机制,构建力学模型用静力解析计算方法对潜在不稳定危岩体进行稳定性评价,为该路的养护、地质灾害治理和改扩建提供依据。关键词:危岩体、岩体结构、DDA 数值模型、失稳方式Stability Analysis for the Classic Dangerous Rock Mass of the south of G217 HighwayAbstract: The geological disasters are frequent along the G217 highway because the geology environment is special, the ecological condition is bad and the variation of topography is great. The collapse in these disasters is the most serious. According to the investigation, there are still lots of dangerous rock mass. This paper analyzes the different dangerous rock mass, researches the forming mechanism by DDA numerical model, makes the stability evaluation by the static analysis method to the dangerous rock mass,and provides the basis for the maintenance, treatment of the geological disaster reconstruction.Key words: dangerous rock mass ; rock mass structure ; DDA numerical model ; mechanism of destruction1 引言G217 国道南段为新疆天山公路小龙池至库车段,全长约 130 公里,由于公路早期设计施工不完善、灾害处治措施不到位,加之沿线地质环境特别,地表植被稀少,物理风化作用强,造成地质灾害频发,其中尤以倒塌最为严重,滑落的岩块常常堵塞公路,威胁行车安全。由于大部分倒塌(危岩体)受控于岩体结构而产生不同的失稳方式,本段沿线边坡危岩体可分为滑塌式、坠落式、倾倒式[1]。本文按失稳方式的不同,借助典型的实例分析其变形破坏机制,运用静力分析计算方法,评价各类倒塌(危岩体)的稳定性。2 危岩体的潜在失稳方式与稳定性评价2.1 滑塌式潜在失稳方式危岩体该类危岩体岩体结构类型主要为层状结构岩...