堤坝软土碎石桩复合地基计算参数研究

doi:10.16285/j.rsm.2022.0708

岩土力学 ›› 2023, Vol. 44 ›› Issue (S1): 669-677.doi: 10.16285/j.rsm.2022.0708

堤坝软土碎石桩复合地基计算参数研究

应宏伟^{1, 2, 3}，闫旭政^{2, 3}，周建^{2, 3}，龚晓南^{2, 3}，王阳扬¹，韩华超⁴，侯靖⁴

1. 河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京 210098；2. 浙江大学滨海和城市岩土工程研究中心，浙江杭州 310058； 3. 浙江大学浙江省城市地下空间开发工程技术研究中心，浙江杭州 310058；4. 中国电建集团华东勘测设计研究院有限公司，浙江杭州 310014

收稿日期:2022-05-12 接受日期:2022-07-27 出版日期:2023-11-16 发布日期:2023-11-21
通讯作者: 闫旭政，男，1997年生，硕士研究生，主要从事地基处理的相关科研工作。E-mail：yanxuzheng188@zju.edu.cn E-mail:ice898@zju.edu.cn
作者简介:应宏伟，男，1971年生，博士，教授，主要从事土力学及岩土工程的教学和科研工作。
基金资助:
中央高校基本科研业务费（No. B200201012）；国家自然科学基金（No. 51678523）；浙江省建设科研项目（No. 2018K119）

Calculation parameters of stone column improved soft soil composite foundation of dam

YING Hong-wei^{1, 2, 3}, YAN Xu-zheng^{2, 3}, ZHOU Jian^{2, 3}, GONG Xiao-nan^{2, 3}, WANG Yang-yang¹, HAN Hua-chao⁴, HOU Jing⁴

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. Engineering Research Center of Urban Underground Development of Zhejiang Province, Zhejiang University, Hangzhou, Zhejiang 310058, China; 4. PowerChina Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 310014, China

Received:2022-05-12 Accepted:2022-07-27 Online:2023-11-16 Published:2023-11-21
Supported by:
This work was supported by the Central Universities Basic Research Funding Project (B200201012), the National Natural Science Foundation of China (51678523) and the Zhejiang Province Construction Research Project (2018K119).

摘要/Abstract

摘要： 目前确定碎石桩复合地基参数时，工程界常采用碎石与原状土参数按平面面积占比叠加的简化方法进行计算，对其适用条件较少关注。以卢旺达那巴龙格河二号水电站高土石坝深厚覆盖层软弱地基处理项目为背景，基于PLAXIS有限元平台，对不同面积置换率下含碎石芯软黏土复合试样进行三轴固结排水试验数值模拟，经室内三轴试验验证了数值模拟方案的合理性。对软土碎石桩复合地基的桩-土作用机制和土体硬化模型计算参数进行研究，将所获参数应用于坝基的变形分析，并与传统参数叠加法和碎石桩墙法进行对比。结果表明：采用数值复合试样法确定的土石坝软土碎石桩复合地基参数是合理的，在计算复合地基沉降时误差小；传统参数叠加法低估了软土碎石桩复合地基的沉降，仅适用于低应力水平、高面积置换率的情况，并且会高估复合地基的强度参数。采用数值复合试样法参数对坝基变形的二维有限元分析表明，根据坝体高度不同采取不同置换率的碎石桩分区加固地基的优化方案是可行的。

关键词: 碎石桩, 软土地基, 三轴试验, 有限元, 参数叠加法, 土体硬化模型

Abstract: When determining the parameters of stone column composite foundation, the simplified method of superposition of gravel and undisturbed soil parameters according to the proportion of plane area is often used in engineering, but the application conditions are seldom focused on. Based on the soft foundation treatment project for the deep overburden layer of the high earth-rockfill dam of the Nyabarongo II Hydropower Station in Rwanda, the triaxial consolidated-drained test numerical simulation of composite soft clay samples with gravel core under different area replacement rates was carried out using the PLAXIS finite element platform, and the rationalization of the numerical simulation scheme was verified by laboratory triaxial tests. The pile-soil interaction mechanism of stone column improved soft soil composite foundation was analyzed and the calculation parameters of hardening soil model were obtained. These parameters were applied to analyze the deformations of the dam foundation, compared with the traditional parameter- superposition method and the stone-column-wall method. The study shows that the parameters determined by the numerical composite sample method are reasonable and the error is negligible to analyze the settlement of the composite foundation of the earth-rock dam. However, the traditional parameter-superposition method underestimates the settlement of composite foundation, and it is only suitable for the conditions of low stress level and high area replacement rate, and will also overestimate the strength parameters of the stone column improved soft soil composite foundation. The two-dimensional finite element analysis of dam foundation deformation using the parameters of numerical composite sample method shows that it is feasible to adopt different replacement rates of stone columns to reinforce the foundation according to the different heights of the dam.

Key words: stone column, soft soil foundation, triaxial test, finite element, parameter-superposition method, hardening soil model

中图分类号: TU 473.1

应宏伟, 闫旭政, 周建, 龚晓南, 王阳扬, 韩华超, 侯靖. 堤坝软土碎石桩复合地基计算参数研究[J]. 岩土力学, 2023, 44(S1): 669-677.

YING Hong-wei, YAN Xu-zheng, ZHOU Jian, GONG Xiao-nan, WANG Yang-yang, HAN Hua-chao, HOU Jing, . Calculation parameters of stone column improved soft soil composite foundation of dam[J]. Rock and Soil Mechanics, 2023, 44(S1): 669-677.

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堤坝软土碎石桩复合地基计算参数研究

Calculation parameters of stone column improved soft soil composite foundation of dam

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