| 垃圾土中排水柱孔扩张问题弹塑性解 |
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| 引用本文： | 赵云,杨忠方,凌道盛,陈鹏,肖昭然.垃圾土中排水柱孔扩张问题弹塑性解[J].岩土力学,2022,43(7):1825-1832. |
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| 作者姓名： | 赵云 杨忠方 凌道盛 陈鹏 肖昭然 |
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| 作者单位： | 1. 河南工业大学 土木工程学院，河南 郑州，450001；
2. 浙江大学 软弱土与环境土工教育部重点实验室，浙江 杭州，310058 |
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| 基金项目： | 国家自然科学基金项目(No.51978247)； |
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| 摘 要： | 随着城市规模扩大，一些垃圾场地被再次利用进行工程建设。垃圾土具有高压缩性、可降解性，其纤维成分具有一定的加筋作用，这些特性给垃圾场地中静力触探、沉桩、旁压试验等工程的开展带来新的挑战。为此，基于考虑纤维加筋作用的垃圾土本构模型和大变形理论，通过引入中间变量，将孔扩张问题转化为求解一组给定边界条件的常微分方程组，继而给出垃圾土中排水柱孔扩张问题的弹塑性理论解。通过将退化解与既有基于修正剑桥模型的柱孔扩张解答对比验证了结果的可靠性。在此基础上，系统分析了超固结比和纤维含量对柱孔扩张过程中孔周应力分布和应力路径的影响。结果表明：与黏性土相比，垃圾土具有更大的塑性区半径；随着超固结比和纤维含量的增加，孔壁处极限压力和塑性区半径分别呈增加和减小趋势，不同纤维含量的垃圾土经历塑性阶段后，均达到泥状物成分的临界状态线附近。
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| 关 键 词： | 垃圾土 柱孔扩张 弹塑性解 纤维含量 超固结比 |
| 收稿时间： | 2021-10-11 |
| 修稿时间： | 2022-04-11 |
Drained elasto-plastic solution for cylindrical cavity expansion in refuse soil |
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| ZHAO Yun,YANG Zhong-fang,LING Dao-sheng,CHEN Peng,XIAO Zhao-ran.Drained elasto-plastic solution for cylindrical cavity expansion in refuse soil[J].Rock and Soil Mechanics,2022,43(7):1825-1832. |
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| Authors: | ZHAO Yun YANG Zhong-fang LING Dao-sheng CHEN Peng XIAO Zhao-ran |
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| Institution: | 1. College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou, Henan 450001, China;
2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China |
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| Abstract: | With the development of urban city scale, more and more refuse soil land is used to conduct engineering construction. Since the refuse soil has the characteristics of high compressibility, biodegradability, and fiber reinforcement, geotechnical engineering such as the cone penetration test, pressure-meter tests, static pile, etc., will meet new challenges in this kind of site. Based on the modified Cam-clay model with fibrous reinforce considered and large deformation theory, through introducing an auxiliary variable, the cavity expansion issue is transformed to solve a set of first-order differential equations with given boundary conditions. The modified Cam-clay model is used to verify the accuracy of this research. Then the effect of over consolidation ration and fiber content to the solution is studied systemically. The results show that the refuse soil has a larger plastic radius compared with clay soil. With the increase of over consolidation ratio and fiber content, the inter cavity pressure and plastic radius show an increasing and decreasing tendency, respectively. After elastic and plastic stage, the refuse soil element with different fiber content reaches nearby the critical state of the paste component. |
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| Keywords: | refuse soil cylindrical cavity expansion elasto-plastic solution fiber content over consolidation ration |
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