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| 路基拓宽工程的基本特性分析 | |
| 引用本文： | 刘金龙,张勇,陈陆望,王吉利.路基拓宽工程的基本特性分析[J].岩土力学,2010,31(7):2159-2163. |
| 作者姓名： | 刘金龙 张勇 陈陆望 王吉利 |
| 作者单位： | 1. 合肥学院,建筑工程系,合肥,230022 2. 浙江工业大学,建筑工程学院,杭州,310032 3. 合肥工业大学,资源与环境工程学院,合肥,230009 4. 中国科学院,武汉岩土力学研究所,武汉,430071 |
| 基金项目： | 安徽省高等学校省级自然科学研究项目，住房和城乡建设部研究开发项目 |
| 摘 要： | 基于非线性有限元方法,对路基拓宽工程的基本特性进行探讨。对比分析表明:拓宽部分竖向沉降与侧向位移的数值明显大于旧路基的相应值,且侧向位移在新旧路基结合处取得最大值,这必然导致新旧路基结合处容易出现拉应力区,从而形成常见的纵向裂缝。对于指定的拓宽宽度来说,在路基两侧进行拓宽比仅在某一单侧拓宽更容易减小新旧路基的沉降差,工程实际中应尽量在旧路基两侧同时进行拓宽。路面竖向沉降的峰值随着土体变形模量的增大而减小,随着土体重度的增大而增大。路基的稳定性随着土体黏聚力或内摩擦角的增大而增大,随着填土重度及车辆等效均布荷载的增大而减小。工程实际中应尽量选用重度小、变形模量大且强度高的土体作为路基拓宽部分的填料。 |
| 关 键 词： | 路基拓宽 竖向沉降 侧向位移 稳定性 |
| 收稿时间： | 2008-08-21 |
Basic characters of road widening engineering |
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| LIU Jin-long,ZHANG Yong,CHEN Lu-wang,WANG Ji-li.Basic characters of road widening engineering[J].Rock and Soil Mechanics,2010,31(7):2159-2163. | |
| Authors: | LIU Jin-long ZHANG Yong CHEN Lu-wang WANG Ji-li |
| Institution: | 1. Department of Civil Engineering, Hefei University, Hefei 230022, China; 2. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310032, China; 3.School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 4. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
| Abstract: | Based on the nonlinear finite element method, the basic characters of road widening engineering are studied. It is found that the vertical settlements, lateral displacements of widening part of subgrade are lager than those of old subgrade. The lateral displacements of road widening engineering get its maximal value at the conjunction between old and new subgrades, which make the longitudinal cracks along road easy to be generated. With a fixed width of widening, it is easy to reduce differential settlement of road with widening at two sides of road than that at one side. The vertical settlement of road is decreased with increase of deformation modulus of soil, which is increased with increase of gravity of soil. Furthermore, the stability of road increased with enhancing of soil strength, which decreased with increase of gravity of soil or equivalent uniform load of vehicle. It is more available to fill the widening engineering with the soil charactered with less dead-weight, large deformation modulus and higher strength. |
| Keywords: | road widening vertical settlement lateral displacement stability |
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