不确定地层属性相关的地下工程鲁棒性

发布时间：2018-02-12 01:52

  本文关键词： 不确定地层属性 地下工程结构设计体系 鲁棒性 破坏机理 相关性　出处：《铁道学报》2017年05期 　论文类型：期刊论文

【摘要】：提出地下工程结构设计体系的鲁棒性概念,建立地下结构力学响应与鲁棒性的联系,明确土压对地下结构鲁棒性产生的控制性影响,以典型地下结构桩基础为样本,讨论主被动土压-地下结构位移-破坏机理-体系鲁棒性之间的联成关系。给出鲁棒-应力解析模型,对不确定地层属性相关的软硬互层(如特殊液化滑移)、交界面地层中地下结构的鲁棒响应进行针对性评价。结合地下工程典型桩基的破坏实例,分析其破坏机理及鲁棒应力响应模式,以给出特殊边界条件下的应力解。对比桩基破坏的监测调查实例发现:桩基础等典型地下结构的整体鲁棒性特征与地上结构的鞭梢效应不同,呈现与不确定地层属性密切相关的类线性整体折断+局部塌沉特点,初步验证评价解析方法的有效性及实用性,为不确定地层属性相关地下工程的鲁棒性及地下结构设计提供一种对比参考。
[Abstract]:The robustness of the concept of underground engineering structure design system, establishing the mechanical response of the underground structure and the robustness of the control effect, clear soil pressure generated on underground structural robustness, a typical underground structure pile foundation as a sample, discuss the main passive earth pressure and underground structure displacement and failure mechanism between the robustness of the system Liancheng. Give a robust stress analytical model of uncertain stratigraphic attributes related to soft and hard interbedded (such as special slip, robust to liquefaction) of underground structure in the formation of the interface for evaluation of response. Combined with the typical failure case of pile foundation of underground engineering, analyzes the failure mechanism and robust stress response mode to stress solution under special boundary conditions are given. Compared the pile foundation failure monitoring survey examples: characteristics and the overall robustness of the pile foundation and other typical underground structure on whiplash effect of structure is not the same, showing The characteristics of the linear global fracture and local collapse are closely related to the uncertain stratigraphic attributes. It preliminarily verifies the effectiveness and practicability of the evaluation and analysis method, and provides a reference for the uncertainty of the underground properties related to the formation attributes and the design of underground structures.

【作者单位】： 北京交通大学城市地下工程教育部重点实验室;北京交通大学土木建筑工程学院;中国中建设计集团有限公司;
【基金】：国家自然科学基金(51378051,51678038) 霍英东教育基金会应用优选资助(122009) 中国国家留学基金(201707095041)
【分类号】：TU93
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本文编号：1504511