| 高铁软基工后沉降特性与加固效果 |
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| 引用本文： | 王敏,徐林荣,黄宇华,周俊杰,蔡雨.高铁软基工后沉降特性与加固效果[J].重庆建筑大学学报,2019,41(1):29-35. |
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| 作者姓名： | 王敏 徐林荣 黄宇华 周俊杰 蔡雨 |
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| 作者单位： | 中南大学 土木工程学院, 长沙 410075,中南大学 土木工程学院, 长沙 410075;中南大学 高速铁路建造技术国家工程实验室, 长沙 410075,中南大学 土木工程学院, 长沙 410075,中南大学 土木工程学院, 长沙 410075,中南大学 土木工程学院, 长沙 410075 |
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| 基金项目： | 国家自然科学基金（51778634）;高铁联合基金（U1134207） |
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| 摘 要： | 高速铁路深厚软土地基的工后沉降控制是世界性难题,为此,依托于沪宁城际高速铁路,统计分析100余公里路基段3 a运营期的沉降监测数据,将工后沉降划分成可以评价沉降控制效果的4个等级,并结合沉降推测评估,将其区划为稳定、基本稳定、临界超限与超限4个状态;针对地基处理措施工后沉降控制效果分析中传统方法存在的问题,提出"当量软弱土厚度"概念,可量化分析地基处理措施的工后沉降控制效果。分析表明：高铁路基的工后沉降与当量软弱土厚度成正相关关系,不同处理措施加固地基存在一个"临界"当量软弱土厚度,桩板结构处理的地基沉降处于临界超限时,对应的当量软弱土厚度是桩筏复合地基的1.7倍,是桩网复合地基的2.2倍;桩板结构处理的地基单位当量软弱土厚度工后沉降值仅为桩筏复合地基的59%,桩筏复合地基是桩网复合地基的76%。
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| 关 键 词： | 高速铁路 桩筏、网复合地基 桩板结构 沉降特性 加固效果 |
| 收稿时间： | 2018/6/14 0:00:00 |
Post-construction settlement characteristics analysis and reinforcement effect of soft soil subgrade of high-speed railway |
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| Wang Min,Huang Yuhu,Zhou Junjie,Cai Yu and Cai Yu.Post-construction settlement characteristics analysis and reinforcement effect of soft soil subgrade of high-speed railway[J].Journal of Chongqing Jianzhu University,2019,41(1):29-35. |
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| Authors: | Wang Min Huang Yuhu Zhou Junjie Cai Yu and Cai Yu |
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| Affiliation: | School of Civil Engineering, Central South University, Changsha 410075, P. R. China,School of Civil Engineering, Central South University, Changsha 410075, P. R. China;National Engineering Laboratory for High-Speed Railway Construction, Central South University, Changsha 410075, P. R. China,School of Civil Engineering, Central South University, Changsha 410075, P. R. China,School of Civil Engineering, Central South University, Changsha 410075, P. R. China and School of Civil Engineering, Central South University, Changsha 410075, P. R. China |
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| Abstract: | How to control the post-construction settlement of deep soft soil foundation in high-speed railway is a worldwide problem. Therefore, analysis of settlement monitoring data of 100 km subgrade during the operation period of 3 years based on the Shanghai-Nanjing inter-city high-speed railway is performed in this paper, and the post-construction settlement is divided into four grades which can be used to evaluate the settlement control effect. Combined with the sedimentation estimation, it is further divided into four states:stability, basic stability, critical overrun and overrun. Aiming at addressing the problems existing in the routine analysis method of post-construction settlement control of foundation treatment measures, the concept of "equivalent soft soil thickness" is proposed, which can quantitatively analyze the effect of post-construction settlement control of foundation treatment measures. Results obtained from the comprehensive analysis show that the post-construction settlement of the high-speed railway subgrade is positively related to the thickness of the weak soil. There exists a "critical" equivalent soft soil thickness in the different treatment measures, and the thickness of the equivalent settlement of the foundation in the pile-soil is 1.7 times of that of pile-raft composite foundation, and it is 2.2 times of pile-net composite foundation. Pile-plate structure treatment foundation is equivalent to weak soil thickness, and its corresponding post-construction settlement is only 59% of pile-raft composite foundation. In addition, the raft composite foundation is 76% of the pile-net composite foundation. |
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| Keywords: | high-speed railway pile-raft(net) composition foundation pile-plank structure settlement characteristics reinforce effect |
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