[1]徐林荣,陈昀灏,商拥辉,等.基于力学-经验模型的交通荷载作用下软基长期沉降计算[J].长安大学学报(自然科学版),2021,41(5):1-10.
 XU Lin rong,CHEN Yun hao,SHANG Yong hui,et al.Long-term settlement calculation of soft soil foundation undertraffic load based on mechanical-empirical model[J].Journal of Chang’an University (Natural Science Edition),2021,41(5):1-10.
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基于力学-经验模型的交通荷载作用下软基长期沉降计算()
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长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年5期
页码:
1-10
栏目:
道路工程
出版日期:
2021-09-15

文章信息/Info

Title:
Long-term settlement calculation of soft soil foundation undertraffic load based on mechanical-empirical model
作者:
徐林荣陈昀灏商拥辉冯多丁奎
(1. 中南大学 土木工程学院,湖南 长沙 410075; 2. 中南大学 高速铁路建造技术国家工程实验室,湖南 长沙 410075; 3. 黄淮学院 建筑工程学院,河南 驻马店 463000)
Author(s):
XU Linrong CHEN Yunhao SHANG Yonghui FENG Duo DING Kui
(1. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China; 2.NationalEngineering Laboratory for Construction Technology of High Speed Railway, Central South University,Changsha 410075, Hunan, China; 3. School of Civil Engineering and Architecture,Huanghuai University, Zhumadian 463000, Henan, China)
关键词:
道路工程软土地基交通荷载累积塑性应变动、静偏应力强度弱化长期沉降计算
Keywords:
road engineering soft soil foundation traffic load cumulative plastic strain dynamic and static deviatoric stress intensity weakening longterm settlement calculation
文献标志码:
A
摘要:
为合理表征交通荷载循环作用下各因素对软土累积塑性应变的影响,并对运营期内车辆荷载引起的软土地基沉降进行有效预测,在总结归纳上海地区典型饱和软黏土动三轴试验基础上,充分衡量动、静偏应力耦合效应的影响,给出耦合应力水平的定义,利用耦合指数χ反映动、静偏应力的各自影响程度,以此对循环荷载影响下软土的强度弱化模型进行指数化修正;引入软化指数极限值,提出修正耦合应力水平的概念,建立起综合反映动、静偏应力耦合作用、固结围压、土体结构性、强度弱化及循环加载次数因素影响的软土累积塑性应变模型,并以此模型为基础进行交通荷载诱发的软土地基长期沉降计算,结合申嘉湖(上海—嘉兴—湖州)高速公路沉降实测数据对计算结果进行检验。研究结果表明:通过对强度弱化模型及累积塑性应变模型进行参数分析可知,耦合应力水平对模型的描述在等向、偏压固结状态下具有统一的适用性;申嘉湖高速公路长期沉降计算表明地基浅表层塑性变形最为显著;在运营初期理论计算曲线与实测曲线略有差异,在运营1年后两者差异逐渐减弱,后期保持较强的一致性;随着运营年限逐渐增大,沉降逐渐趋于稳定,预估通车550 d后软土地基累积沉降量达128 mm,与实测数据的相对误差仅为1.68%,说明该模型合理可靠。
Abstract:
To reasonably characterize the influence of various factors on the cumulative plastic strain of soft soil under the cyclic action of traffic load, and effectively predict the settlement of soft soil foundation caused by vehicle load during the operation period, based on summarizing the typical dynamic triaxial test of saturated soft clay in Shanghai, and on the basis of fully measure the effect of dynamic and static deviatoric stress coupling effect, the definition of coupling stress level was given, the parameter χ that reflect the dynamic and static deviatoric stress the degree of their influence, in order to strength weakening of soft clay under the influence of cyclic loading model to correct the indexation. By introducing the limit value of softening index, the concept of modified coupling stress level was proposed, and the cumulative plastic strain model of soft soil was established, which comprehensively reflected the influence of coupling effect of static and static deviator stress, consolidation confining pressure, soil structure, strength weakening and cyclic loading times. Based on this model, the longterm settlement of soft soil foundation induced by traffic load was calculated, and the calculated results were tested with the measured data of Shenjiahu (ShanghaiJiaxingHuzhou) Expressway settlement. The results show that the description of the coupling stress level has uniform applicability in the isotropic and biased consolidation state, through the parameter analysis of the strength weakening model and the cumulative plastic strain model. The calculation results of longterm settlement of Shenjiahu Expressway show that the plastic deformation of shallow surface layer is the most significant. There is a slight difference between the theoretical calculation curve and the measured fitting curve in the initial operation period, and the difference between them gradually weaken after one year of operation, and maintain a strong consistency in the later period.With the increasing of operation years, the settlement gradually tends to be stable. The estimated cumulative settlement of soft soil foundation reaches 128 mm in 550 d after operation, and the relative error is only 1.68% compared with the measured data, indicating that the model is reasonable and reliable. 7 tabs, 11 figs, 28 refs.

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更新日期/Last Update: 2021-09-30