软土路基侧向变形对邻近建筑基础的影响分析

发布时间：2018-01-05 07:24

本文关键词：软土路基侧向变形对邻近建筑基础的影响分析　出处：《铁道工程学报》2017年06期 　论文类型：期刊论文

【摘要】：研究目的:在软土上填筑路基不仅会产生沉降,而且会产生较大的侧向变形,对邻近建筑基础产生较大推力,导致基础变形、开裂,甚至倾倒。因此,有必要对软土路基侧向水平应力的分布规律进行研究,提出侧向变形影响范围的判定方法,对影响范围内基础所受水平推力进行求解,从而为邻近建筑基础的布置及加固分析提供科学依据。研究结论:以丽(江)香(格里拉)铁路跨越高速公路软基为例,应用弹性理论弗拉蒙(Flamant)应力解答和绕流阻力法进行计算分析,得出如下结论:(1)侧向水平附加应力随深度先增大后减小,呈"弓"形变化;(2)水平附加应力小于土的连结强度时,可忽略侧向变形的影响,据此判断侧向变形的影响宽度和深度;(3)影响范围内基础所受水平推力,可依据绕流阻力法进行求解;(4)本研究结论可对软土路基侧向变形范围分析及水平推力计算提供一定的理论依据。
[Abstract]:The purpose of this study is that filling subgrade on soft soil will not only produce settlement, but also produce large lateral deformation, which will produce greater thrust on adjacent building foundation, resulting in foundation deformation, cracking and even toppling. It is necessary to study the distribution law of lateral horizontal stress in soft soil subgrade, and put forward the method of determining the influence range of lateral deformation, and solve the horizontal thrust of foundation in the influence range. So as to provide scientific basis for the arrangement and reinforcement analysis of adjacent building foundation. Conclusion: take Lijiang (Jiang) Xiang (Grira) railway crossing the soft foundation of expressway as an example. The stress solution of Flamant and the method of flow resistance are used to calculate and analyze the elastic theory. The conclusion is as follows: 1) the lateral horizontal additional stress increases first with depth and then decreases. Changing in the shape of "bow"; (2) the influence of lateral deformation can be neglected when the horizontal additional stress is smaller than the bonding strength of the soil, and the influence width and depth of the lateral deformation can be judged accordingly; 3) the horizontal thrust of the foundation in the range of influence can be solved by the method of flow resistance. 4) the conclusion of this study can provide some theoretical basis for lateral deformation range analysis and horizontal thrust calculation of soft soil subgrade.
【作者单位】：西南交通大学;中铁二院工程集团有限责任公司;
【分类号】：TU470;U416.1
【正文快照】： 研究结论:以丽(江)香(格里拉)铁路跨越高速公路软基为例,应用弹性理论弗拉蒙(Flamant)应力解答和绕流阻力法进行计算分析,得出如下结论:(1)侧向水平附加应力随深度先增大后减小,呈“弓”形变化;(2)水平附加应力小于土的连结强度时,可忽略侧向变形的影响,据此判断侧向变形的影

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