【作者】 张东亮；

【导师】 刘保县；

【作者基本信息】 西华大学 ， 岩土工程， 2010， 硕士

【摘要】 我国西部地区存在着许多土石混合体边坡,且西部大部分地区又处于强震区,地震活动强、频度高,这样的环境不可避免地带来了大量和地震作用有关的土石混合体边坡问题,随着西部大开发战略的实施,相当多的岩土工程将建在强震区,土石混合体边坡的地震稳定性问题也显得日趋突出。地震效应对土石混合体边坡的影响是个极其复杂的动力过程,国内对此课题的研究尚不多见,到目前为止,边坡地震作用下稳定性分析仍采用基于极限平衡理论的拟静力法,抗震设计方面仍停留在经验状态,严重影响了设计的可靠性、经济性和科学性。因此对土石混合体边坡在地震作用下失稳机制以及稳定性评价方法进行深入研究,不仅能推动地震作用下土石混合体边坡稳定性理论的发展和创新,而且能够为岩土工程建设的决策、设计和施工提供技术支持,具有重要的理论意义和实践意义。本文以汶川茅草坪滑坡为研究对象,在野外地质调查、资料收集和分析基础上,详细的阐述了茅草坪边坡的工程地质特征,并由此概化出滑坡基本地质模型。在相关领域已有的研究基础上,开展了地震作用下土石混合体边坡的稳定性研究,具体的研究内容与取得的成果如下:(1)分析了地震作用下土石混合体边坡稳定性的影响因素,讨论地质构造、地层岩性、地形地貌、边坡内部结构等内因和地震荷载、人为因素等外因对边坡的稳定性影响,从而为土石混合体边坡的设计和加固提供指导。(2)分析了地震作用下土石混合体边坡失稳破坏机理,主要有累积和触发效应、高位滑坡抛射运动、碎屑流化等。(3)运用基于FLAC-3D弹塑性理论对都汶路茅草坪边坡工点进行了天然状态下和地震作用下的稳定性分析,分析结果显示了对土石混合体边坡地震稳定性总体态势的把握。更多还原

【Abstract】 There are many mixture slope in western china , and most of western china are in the earthquake zone.The environment, in seismicly strong and high frequency activity, inevitably leads to many problems of earthquake-related mixture slope. With the implementation of the western development strategy, a significant number of geotechnical engineerings will be built in earthquake zone mixture slope of the seismic stability.The problem appears to becoming more prominent.Seismic effect on the slope of rock and soil blending is a very complex dynamic process, the domestic research on this subject is still few. so far, seismic slope stability analysis is still under the limit equilibrium theory which is based on quasi-static .Seismic design experience is still at the state, it has seriously affected the reliability of the design, economic and scientific. Therefore, a mixture of earth and rock slope under seismic stability evaluation of failure mechanism. The method of in-depth study would not only promote mixed under earthquake debris slope stability theory development the innovation for the geotechnical engineering construction, which is in the decision-making, design and construction to provide technical support, has important theoretical and practical significance.In this paper, Wenchuan turf landslide study is based on the field of geological survey, data collection and analysis .The paper elaborates the detail of the Lawn Slope engineering geological characteristics. Thus,it takes the basic geological model of the landslide. In related fields based on existing research carried out under earthquake mixture slope stability studies, the specific content and the results are as follows:(1) The paper is analysis of the seismic mixture slope stability factors.It is not only discussed the geological structure, lithology, topography, slope of the internal structure of the internal,also discussedthe seismic loading, human factors impact of external factors. It is on the slope stability, so as to mixture slope design and reinforcement to provide guidance.(2) The paper is analysis of the Seismic mixture slope failure mechanism.It is mainly accumulated and trigger effects, high projectile motion landslide, debris flow and so on.(3) The FLAC-3D elastic-plastic theory is based on duwen Road Turf point slope workers under natural conditions. The earthquake is on the stability analysis and the results demonstrated a mixture slope seismic stability of the overall situation of grasp.更多还原