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孙志浩,雷菲菲,薛文静,等. 非对称荷载下内撑式基坑受力变形分析[J]. 科学技术与工程, 2021, 21(24): 10222-10228.
Sun Zhihao,Lei Feifei,Xue Wenjing,et al.Stress and deformation analysis of internal bracing foundation pit under asymmetric load[J].Science Technology and Engineering,2021,21(24):10222-10228.
非对称荷载下内撑式基坑受力变形分析
Stress and deformation analysis of internal bracing foundation pit under asymmetric load
投稿时间:2021-03-01  修订日期:2021-06-07
DOI:
中文关键词:  基坑工程  小应变本构  非对称荷载  有限元  荷载距离
英文关键词:excavation engineering  small strain constitutive  asymmetric load  finite element  load distance
基金项目:国家自然科学基金-高铁联合基金(U1934208); 国家杰出青年科学基金(No.51725802);浙江省自然科学基金委员会-华东院联合基金(LHZ19E080001); 国家自然科学基金(51878276);浙江大学平衡建筑研究中心配套资金资助(20203512-10C).
                    
作者单位
孙志浩 浙江大学建筑工程学院
雷菲菲 杭州市钱江新城建设开发有限公司
薛文静 浙江省交通投资集团有限公司
范润东 浙江杭海城际铁路有限公司
侯世磊 中铁十四局集团第四工程有限公司
梁禄钜 浙江大学建筑工程学院
徐长节 浙江大学建筑工程学院
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中文摘要:
      本文以某坑边荷载距离不同的综合管廊基坑为例建立了二维有限元模型,土体采用基于硬化土模型的小应变本构模型,模型计算结果与实测数据吻合良好,从而验证了模型的有效性。在此模型基础上,通过改变基坑一侧荷载距离建立多组模型,研究了两侧荷载距离不同对支撑轴力及坑外地表沉降的影响。研究结果表明;下道支撑轴力对荷载距离的改变较为敏感,当D1由0.1m增加至2.0h时,下道支撑轴力将减小24%;当改变基坑左侧荷载距离时,基坑右侧坑外地表沉降值也会发生较大变化,当D1由0.1m增加至2.0h时,右侧坑外地表沉降最大值将增大33%。得到的结论可供类似工程参考借鉴。
英文摘要:
      In this paper, a two-dimensional finite element model was established for an excavation of a pipe gallery with neighboring loads of different distances. The hardening small strain constitutive model was applied to simulate the soil mass. The calculated results of the model are in good agreement with the measured data, showing the validity of the model. Based on the verified model, several sets of models were established by changing the load distance on one side of the excavation. The influence of different load distances on the axial force of the support and the ground settlement was studied. The results indicate the following conclusions. The axial force of lower support is more sensitive to the change of load distance. When D1 is increased from 0.1 m to 2.0 h, the axial force of lower support will decrease by 24 %. When the load distance on the left side adjacent to the excavation is changed, the ground settlement of the right side to the excavation will also be changed greatly. When D1 is increased from 0.1 m to 2.0 h, the maximum ground settlement of the right side will increase by 33%. The obtained conclusions can be used as a reference for similar cases in practice.
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