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| 原状土e-lgp曲线的S形函数表达及简化加载固结试验方法 |
| On the expression of e-lgp curve S-shaped function for undisturbed soil and simplified loading and consolidation experimental method |
| Received:April 08, 2017 Revised:July 23, 2017 |
| DOI：10.7520/1001-4888-17-088 |
| 中文关键词: 原状细粒土 e-lgp曲线 S形曲线函数 先期固结压力 正常固结状态带 简化固结试验 |
| 英文关键词:undisturbed fine-grained soil e-lgp curve S-shaped curve function preconsolidation pressure normal consolidation status zone simplified consolidation test |
| 基金项目:国家973计划课题(2013CB036204) |
| Author Name | Affiliation | | ZHAO Ming-zhi | 1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China | | LUO Qiang* | 1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China | | JIANG Liang-wei | 1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China | | WEI Ming | 1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| 中文摘要: |
| 为能够较为合理地确定土体压缩参数并简化固结试验加载过程，结合京沪高铁李窑试验段地基原状细粒土样标准固结试验数据，对比分析了多项式和三种S形曲线函数在描述原状土e-lgp曲线发展规律时的差异性，探讨了先期固结压力的合理计算原则，提出了简化加载级数的固结试验方法。结果表明，多项式函数易受数据波动而导致整体拟合偏差，S形曲线函数的待定参数可良好稳定地反映曲线最小曲率半径点和直线段斜率，为较理想的e-lgp曲线数学函数表达式；通过分析Arvidsson法、Gregory法和Casagrande法,确定先期固结压力时的不同取值原则，获得了先期固结压力值的变化区间，提出土体由超固结过渡到欠固结状态时存在正常固结状态带的概念，用于判断土体固结特性较为客观合理；利用土体初始孔隙比和两级或三级荷载下的变形值可确定S形曲线函数待定参数，据此建立了简化加载级数的固结试验方法。上述研究成果可为准确判定土体固结特性、快速获取土体压缩参数提供理论指导。 |
| 英文摘要: |
| In this paper, in order to reasonably determine the compression parameters of soil and to simplify the loading process of consolidation experiment, combined with the standard consolidation experimental data of the undisturbed fine-grained soil taken from the foundation in Liyao test section of Beijing to Shanghai high-speed railway, the difference among polynomial and three S-shaped curve functions used in describing e-lgp curve development of undisturbed soil is compared and analyzed, the reasonable calculation principle of preconsolidation pressure is discussed, and simplified loading series consolidation experiment method is put forward. Study results show that the polynomial function is susceptible to data fluctuation, which leads to the deviation of the whole fitting; The undetermined parameters of S-shape curve functions can well and stably reflect the minimum curvature radius point and the slope of straight line segment of curve, therefore become an ideal mathematical function expression of e-lgp curve; through analysis of Arvidsson method, Gregory method and Casagrande method, different selection principles for preconsolidation pressure are determined, the variation interval of preconsolidation pressure is obtained; when soil is in transition from overconsolidation to underconsolidation, the concept of normal consolidation zone existence is proposed, which is more objective and reasonable to judge the consolidation characteristics of soil; the undetermined parameters in S-shape curve functions can be determined by initial void ratio and deformation values under two-stage or three-stage loading conditions; based on this, consolidation experimental method of simplified loading series is established. Above results can provide theoretical guidance to correctly determine soil consolidation characteristics and rapidly obtain soil compression parameters. |
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