固化人工硬壳层双层地基承载试验及理论研究  

Experimental and theoretical study on bearing capacity of double artificial crust layers foundation formed by consolidation

作　　者：胡振华[1] 王颖 李大勇[1] 肖洪天[1] HU Zhenhua;WANG Ying;LI Dayong;XIAO Hongtian(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Transportation,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学交通学院,山东青岛266590

出　　处：《人民长江》2020年第2期147-152,共6页Yangtze River

基　　金：山东省自然科学基金项目(ZR2017BD037,ZR2019PEE044);山东省博士后创新项目(201703023);山东科技大学人才引进科研启动基金项目(2017RCJJ055)。

摘　　要：在围海造陆工程中为了缩短工期,同时解决砂石填料紧缺、成本高,以及减少弃土的开挖、运输和堆放等问题,常采用就地固化处理形成人工硬壳层,为后续工程的开展提供作业平台。从室内模型试验和理论分析两方面入手研究了人工硬壳层下的地基承载力。结果发现:模型试验中地基破坏的模式为上层固化层剪切破坏,下卧层发生整体剪切破坏;就地固化形成的人工硬壳层可大幅提高地基的承载力。对比两种试验结果可知下卧层的强度对地基承载力影响大。此外,基于双层地基冲剪破坏理论推导了模型试验中方形基础的地基承载力公式,发现其计算结果与试验结果符合良好。最后用应力扩散原理研究了地基承载力,推荐上层土扩散角应大于30°。To shorten the construction time, solve the problems of filling materials shortage and to avoid high cost and huge excavation, transport and stacking of abandoned soil in projects such as embankments and deep soft subgrade embankments, artificial hard shell layer formed by in-situ curing treatment is used, which can provide a working platform for the subsequent project. The bearing capacity of the double artificial crust layers foundation is studied by indoor model test and theoretical analysis. It shows that shear failure is in upper crust layer and complete shear failure is in the underlying layer. The local crust consolidation can improve the bearing capacity of the compound foundation. The results show that the strength of the underlying layer has a great influence on the bear capacity of the whole foundation. Based on the model test and the punching theory of the double artificial crust layers foundation, we induced a formula of bearing capacity for square foundation, and the calculated results from the formula were well in accordance with test results. Finally, the stress dispersion principle is used to study the bearing capacity, and it is found that the dispersion angle of the upper crust is larger than 30 degrees.

关 键 词：人工硬壳层 就地固化处理 地基承载力 模型试验 应力扩散原理 双层地基冲剪破坏 

分 类 号：TU472[建筑科学—结构工程]