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基坑底部土体裙边加固模型试验与数值模拟研究
熊伟1,2, 邓建林3, 钟庆华3, 徐立明3, 徐长节1,2,4,5
1.华东交通大学 江西省岩土工程基础设施安全与控制重点实验室;2.江西省地下空间技术 开发工程研究中心, 南昌 330013;3.浙江杭海城际铁路有限公司, 浙江 嘉兴 314000;4.浙江大学 滨海和 城市岩土工程研究中心;5.浙江省城市地下空间开发工程技术研究中心, 杭州 310058
摘要:
为研究基坑底部土体裙边加固对基坑变形和内力的影响,分别对未进行坑底加固和采用坑底裙边加固2种工况进行模型试验。在填土过程中预先浇筑加固土体,实现坑底土体加固。在基坑开挖过程中对地表沉降、冠梁侧向位移、桩身弯矩以及桩后土压力进行监测。用有限元软件Abaqus对模型试验进行拓展,将基坑变形的计算结果进行极差分析。研究表明,对坑底土体采用裙边加固,可以有效地减小支护结构的侧向位移;坑顶地表沉降虽有减小,但效果不明显;桩身弯矩略小于未进行坑底加固的工况;土体开挖,桩随着坑底下某一点发生转动,造成桩上半部分土压力减小,桩底处土压力增大;裙边加固尺寸中深度相较于宽度对基坑的变形影响更大;土体加固深度与宽度超过一定范围,控制基坑变形的效果有所提高但不明显,加固深度宜取0.3~0.4倍的开挖深度,宽度宜取0.35~0.45倍的开挖深度。
关键词:  基坑开挖  模型试验  有限元  裙边加固  加固范围
DOI:10.11835/j.issn.2096-6717.2019.089
分类号:
基金项目:国家杰出青年科学基金(51725802);国家自然科学基金(51878276);江西省落地计划成果转化项目(KJLD4036)
A model test and numerical study of skirt border reinforcement in the bottom of the excauation
Xiong Wei1,2, Deng Jianlin3, Zhong Qinghua3, Xu Liming3, Xu Changjie1,2,4,5
1.Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering;2.Engineering Research & Development Centre for Underground Technology of Jiangxi Province, East China Jiaotong University, Nanchang 330013, P. R. China;3.Zhejiang Hanghai Intercity Railway Co., Ltd, Jiaxing 314000, Zhejiang, P. R. China;4.Research Center of Coastal and Urban Geotechnical Engineering;5.Engineering Research Center of Urban Underground Development of Zhejiang Province, Zhejiang University, Hangzhou, 310058, P. R. China
Abstract:
In order to study the effect of skirt soil reinforcement on the deformation and stress of foundation pit, model tests were carried out for cases without bottom reinforcement and skirt reinforcement respectively. To realize the reinforcement of bottom soil, the method of reinforcing soil by pre-pouring in the process of filling was adopted. The ground subsidence,the lateral displacement of top beam,the bending moment of piles and the earth pressure are measured during excavation. Extensive FE parametric studies indicate that the skirt reinforcement can effectively reduce the lateral displacement of the supporting structure. Although surrounding settlements decreased, the effect is less obvious. The bending moment of the pile is slightly less than that of the pile without reinforcement. With the excavation, the earth pressure in the upper part of the pile decreases and pressure at the bottom increases as the pile rotates at a certain point under the pit. The depth of skirt reinforcement has greater influence on the deformation of foundation pit than the width of reinforcement. When the depth and width of soil reinforcement exceed a certain range, the effect of controlling the deformation of foundation pit is marginaly improved. The reinforcement depth should be 0.3~`0.4 times of the excavation depth and the width should be 0.35~0.45 times of the excavation depth.
Key words:  basement excavation  model test  finite element method  skirt border reinforcement  reinforced range
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