| 济南典型地层HSS参数选取及适用性研究 |
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| 引用本文： | 李连祥,刘嘉典,李克金,黄亨利,季相凯.济南典型地层HSS参数选取及适用性研究[J].岩土力学,2019,40(10):4021-4029. |
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| 作者姓名： | 李连祥 刘嘉典 李克金 黄亨利 季相凯 |
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| 作者单位： | 1. 山东大学 基坑与深基础工程技术研究中心，山东 济南 250061；2. 山东大学 土建与水利学院，山东 济南 250061；
3. 中铁十四局集团隧道工程有限公司，山东 济南 250013 |
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| 基金项目： | 国家自然科学基金(No. 51508310)；山东省自然科学基金(No. ZR2018QEE008)；济南市科技计划项目(No. 201201145)；中铁十四局紧邻平行地铁车站结构群施工效应控制技术研究与应用项目。 |
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| 摘 要： | 针对济南地区典型地层上的基坑工程，土体采用PLAXIS 3D中的硬化土小应变（HSS）模型，建立了有限元模型，并根据实际监测数据结合位移反分析技术，得到了该典型地层下土体HSS模型参数的一般选取方法。之后简化模型，分别采用土体的HSS模型与Mohr-Coulomb（M-C）模型进行有限元分析，对比基坑开挖至不同深度时，应用两种模型模拟所得挡土墙变形与墙后地表沉降的差异。结果表明：基坑数值分析中，土体采用M-C模型与HSS模型所得结果的差异随基坑挖深增加而增加，且采用HSS模型所得结果更符合深基坑的实际变形。综合考虑采用HSS模型与M-C模型建模时的参数选取难易程度、经济性以及两种模型数值分析的工程适用性，建议基坑开挖超过15 m时，土体采用HSS模型进行数值分析，反之可采用M-C模型。研究结果对指导深基坑支护设计及岩土工程参数的勘察、选取，具有重要参考价值。
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| 关 键 词： | HSS模型 位移反分析 适用性 深基坑 |
| 收稿时间： | 2018-07-29 |
Study of parameters selection and applicability of HSS model in typical stratum of Jinan |
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| LI Lian-xiang,LIU Jia-dian,LI Ke-jin,HUANG Heng-li,JI Xiang-kai.Study of parameters selection and applicability of HSS model in typical stratum of Jinan[J].Rock and Soil Mechanics,2019,40(10):4021-4029. |
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| Authors: | LI Lian-xiang LIU Jia-dian LI Ke-jin HUANG Heng-li JI Xiang-kai |
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| Institution: | 1. Foundation Pit and Deep Foundation Engineering Research Center, Shandong University, Jinan, Shandong 250061, China;
2. School of Civil Engineering, Shandong University, Jinan, Shandong 250061, China;
3. China Railway 14th Bureau Group of the Tunnel Engineering Co., Ltd., Jinan, Shandong 250013, China |
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| Abstract: | Aiming at the foundation pit engineering in the typical stratum of Jinan, the hardening soil small-strain (HSS) model in PLAXIS 3D is adopted to establish the finite element model, and according to the actual monitoring data and the displacement back analysis, a general method of selecting the parameters for the HSS model in this typical stratum is obtained. Then the HSS model and the Mohr-Coulomb (M-C) model are analyzed by the simplified finite element analysis. The simulation results of the deformation of the retaining wall and the ground surface settlement behind the wall under different excavation depths are compared. The results show that the difference between the simulation results of M-C model and HSS model increases with the increase of excavation depth, and the results of HSS model are more in line with the actual deformation. Considering the difficulty and economy of parameters selection and the engineering applicability of the two models, it is suggested that when the excavation exceeds 15 m, the HSS model should be taken, otherwise, the M-C model should be taken. The research results have important reference value to guide the design of deep foundation pit and the investigation and selection of geotechnical engineering parameters. |
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| Keywords: | HSS model displacement back analysis applicability deep foundation pit |
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