轻量土最优含水率模型与检验

侯天顺; 徐光黎

轻量土最优含水率模型与检验 English Version

侯天顺^1,2,
徐光黎¹

（ 1.中国地质大学生物地质与环境地质教育部重点实验室，湖北武汉430074 ; 2. 西北农林科技大学水利与建筑工程学院，陕西杨凌712100 ）

基金项目: 质教育部重点实验室开放基金项目(BGEGF200814)

详细信息

作者简介:
侯天顺(1981– )，男，湖北省郧西县人，博士研究生，主要从事土力学基本理论与土体工程性质研究。

中图分类号: TU411.3
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出版历程
- 收稿日期: 2010-04-11
- 发布日期: 2011-07-14

Optimum water content models and tests of lightweight soil

HOU Tian-shun^1,2,
XU Guang-li¹

(1. Key Lab of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China; 2. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China)

摘要

摘要: 为确定不同配比轻量土的最优含水率，提出ρ_d-w模型，qu-w模型，RS-w模型3种最优含水率模型，假设3种模型可以统一表示为开口向下的抛物线函数，从理论上推导出了最优含水率解析式。为检验3种最优含水率模型及确定模型系数，通过试验对轻量土物理力学特性进行了研究。结果表明：轻量土的干密度、无侧限抗压强度、比强随着含水率的增大，先增大后减小，存在最优含水率，曲线形态类似于抛物线。用3种最优含水率模型对实测数据进行回归分析，模型计算得到的最优含水率与图解法直接得到的含水率值是极其接近的。结合前人成果，qu-w模型，RS-w模型对应的最优含水率几乎相同，而与ρ_d-w模型对应的含水率略有差别，3种模型对应的最优含水率基本上是相同的。轻量土的最优含水率为混合物物理需水与化学需水的总和，是复杂物理化学反应需水量的外在表现，是3种模型具有统一性的理论基础。以RS-w模型为例，计算出了轻量土各组分的质量需水率，与原材料性质关系较为密切。
- 轻量土 /
- 最优含水率 /
- 密度 /
- 无侧限抗压强度 /
- 比强 /
- 击实试验
Abstract: To determine the optimum water content of light weight soil with different mixture proportions, three kinds of models for the optimum water content are put forward: ρ_d–w model, qu–w model and RS-w model. It is supposed that three models can be expressed as a uniform downward opening parabola function. Analytic expressions for the optimum water content are theoretically derived. To test the above three models and to determine model coefficients, physical mechanical properties of light weight soil are studied by laboratory tests. The results show that the dry density, unconfined compressive strength and specific strength first increase and then decrease with the increase of water content, each of them has an optimum water content, and their curve shapes are similar to parabola. The measured data are analyzed based on the three models, the optimum water content calculated by models are very close to that obtained directly by the graphic method. By use of the precursors’ research achievements, the corresponding optimum water contents of qu–w model and RS-w model are almost the same, but they are slightly different from the corresponding optimum water content of ρ_d–w model. The optimum water contents of the three models are essentially the same. The optimum water content of light weight soil is the sum of physical and chemical water demand, it is an external appearance of water demand of complex physical and chemical reactions, and it is a theoretical basis for the three models to be unified. Taking RS–w model for an example, the water demand rate of mass of different components are calculated, and the results are closely related to properties of materials.
- light weight soil /
- optimum water content /
- density /
- unconfined compressive strength /
- specific strength /
- compaction test

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参考文献(15)

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