【作者】 祝磊；

【导师】 孔思丽；

【作者基本信息】 贵州大学 ， 岩土工程， 2006， 硕士

【摘要】 基坑工程是集岩土工程和结构工程等多学科于一体的系统工程，综合性强，影响因素众多。深基坑工程不仅存在基坑本身的安全和稳定问题，而且还会因土方开挖引起的周围地层移动而可能危及相邻建筑物、地下管网和城市市政设施等。能否预测并控制住基坑及周围地表的变形往往是基坑设计成败的关键。 本文利用计算机分析的优势，用先进的大型有限元程序Ansys8.0对贵州山区基坑开挖对周围环境的影响进行分析。数值模拟模型采用Drucker-Prager理想弹塑性本构模型，土体采用八节点六面体等参数单元，桩采用梁单元，锚索采用空间杆单元。 本文阐述了基坑在无支护情况和有支护情况下(悬臂桩和桩、锚索共同作用支护结构体系)施工开挖引起的变形规律。确定出了基坑开挖后的应力场和位移场，得到了基坑边坡的侧向位移曲线和基坑周围地表沉降值及沉降范围。 本文的研究对基坑工程信息化施工有指导作用，并可供基坑工程优化设计和研究基坑开挖对周围环境造成的影响时参考。更多还原

【Abstract】 The Foundation Pit Engineering incorporates the geotechnique and structure Engineering into an organic integrity influenced by many factors. The problem of the Foundation Pit Engineering lies not only in the safety and stability of foundation, but also in the danger of the neighboring buildings, underground pipes, municipal equipment due to the displacement of stratum under excavation. It is the key to the success of foundation pit design that whether the displacement of the foundation and surrounding soils can be forecasted and controlled.Taking advantage of computer, this article adopts large finite element method programe Ansys8.0 to analyze, the influence of pit excavation of Guizhou mountainous area on its surrounding environment. The model adopts Drucker-Prager ideal elastic-plastic stress-strain model; soil body uses eight-nodes isoparametric heaxhedrite element, anchor ropes use space link element, and piles use beam element.This article describes deforming regularity of pit excavation in two deferent retaining structure (piles and coaction of piles and anchor ropes). So the stress field and displacement field after pit excavation are to be fixed. And the lateral displacement curve of the foundation slope, the settlement range and value of the surrounding ground are also to be calculated.This study is hoped to make a guidable role in designing the excavation and be a reference to the research of the influence to surrounding environment by deep excavation. Therefore we may fit the information construction process and optimum design.更多还原