【作者】 李杰；

【导师】 葛克水；

【作者基本信息】 中国地质大学（北京） ， 地下建筑工程， 2008， 硕士

【摘要】 随着城市建设的飞速发展,地下空间的利用率越来越高,在建筑深基坑开挖深度越来越深的同时,深基坑建址的密集度也越来越高。正在施工的一片建筑群中时常出现相邻深基坑相互影响相互交叉的现象。深基坑工程常常用到锚杆、土钉等细长受拉杆件,在密集的基坑群中常出现地下杆件相互穿插相互影响的情况。受拉杆件的长度往往是深基坑支护设计的重点,相邻近基坑的建设必然影响到受拉杆件的长度。目前对地下杆件相互穿插,相互影响的临近的多个深基坑支护工程的研究并不常见,可以做为设计参考依据的工程实例也不多见。本文以北京五棵松一带两个相互临近的深基坑为对象,通过解析计算和FLAC-2D数值模拟对临近深基坑的构件和土体受力状况作出了初步研究。在本工程中技术人员初次设计并使用了将两支护工程的地下杆件合为一用的施工方法,本文称之为对拉式支护结构。本文对这种对拉式支护结构中的土钉墙、桩锚支护两个组成部分分别进行了设计验算;使用了极限平衡法对桩锚-土钉墙、土钉墙-土钉墙式对拉支护结构做了抗滑移、抗倾覆、内部整体稳定性的验算;使用了FLAC-2D有限差分程序对桩锚-土钉墙对拉支护模型进行了数值模拟计算;通过对工程中部分观测数据的分析和数值模拟结果的对比,解析设计结果和数值模拟结果的对比,总结了FLAC-2D数值模拟在对拉支护工程中的适用性。更多还原

【Abstract】 With the rapid development of urban, underground space utilization is geting more and more.Foundation pit is deeper and deeper, at the same time the density of foundation pit site is more intensive.Deep excavation bracing often used slender rods as anchor cable and soil nails.Adjacent constructing foundation pits usually influence mutually by the underground bars.The lengthe of anchor cable and soil nails is a keystone of design,but the adjacent constructing foundation pits strictly limit the length of cable and nails.At present the study of adjacent foundation pits and interactional underground bars is uncommon,and the engineering design examples are very infrequent.In this thesis the author taken two adjacent foundation pits as an example, and used the analytical calculation and FLAC-2D numerical simulation softwears as tools,and makes a preliminary study of mechanics characteristic of factors in adjacent foundation pits.In this project, the engineers designed and used the anchor cable and soil nails of two adjacent foundation pits combined together,and in this thesis the author named this foundation pit bracing construction technology as cross anchor structure.The thesis point did a analytical calculation to the soil nailing wall and anchored soldier piles in this project,and used the FLAC-2D programme to make a numerical simulation to the model of cross anchor structure,and contrast observation data nonlinear regression analysis result and the simulation result.更多还原