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| 含水率对煤系土抗剪强度的影响 | |
| 引用本文： | 胡昕,洪宝宁,杜强,孟云梅.含水率对煤系土抗剪强度的影响[J].岩土力学,2009,30(8):2291-2294. |
| 作者姓名： | 胡昕 洪宝宁 杜强 孟云梅 |
| 作者单位： | 1. 中国电力工程顾问集团,西北电力设计院,西安,710065;河海大学,岩土力学与堤防工程教育部重点实验室,南京,210098 2. 河海大学,岩土力学与堤防工程教育部重点实验室,南京,210098 3. 南京工程学院,建筑工程学院,南京,211167 |
| 基金项目： | 国家自然科学基金资助项目，广东省交通厅科技项目 |
| 摘 要： | 煤系土具有遇水软化的特点,强度随含水率的增加急剧下降.以分布在广州-梧州高速公路沿线的煤系土为研究对象,在分析其物理特性的基础上,通过常规直接剪切试验测定了不同含水状态煤系土试样的抗剪强度,分析了含水率对煤系土抗剪强度的影响,并提出了实际工程中处治煤系土的建议.研究结果表明:煤系土抗剪强度与起始含水率具有明显的相关关系,且起始含水率越大,抗剪强度越小.随着含水率的增大,煤系土黏聚力总体呈减小趋势,但变化趋势具有显著的阶段性.当含水率小于某一值时,煤系土黏聚力随含水率增大变化幅度较小;当含水率高于该值后,煤系土黏聚力随含水率增大急剧降低,凝聚力对数与含水率呈线性关系.含水率变化对煤系土内摩擦角的影响较小,但在含水率增大过程中,煤系土内摩擦角先增后减,具有明显的峰值. |
| 关 键 词： | 煤系土 抗剪强度 水敏感性 直剪试验 |
| 收稿时间： | 2007-09-12 |
Influence of water contents on shear strength of coal-bearing soil |
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| HU Xin,HONG Bao-ning,DU Qiang,MENG Yun-mei.Influence of water contents on shear strength of coal-bearing soil[J].Rock and Soil Mechanics,2009,30(8):2291-2294. | |
| Authors: | HU Xin HONG Bao-ning DU Qiang MENG Yun-mei |
| Institution: | 1. Northwest Electric Power Institute, China Power Engineering Consulting Group Corporation, Xi’an 210098, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 3. College of Architecture and Engineering, Nanjing Institute of Technology, Nanjing 211167, China |
| Abstract: | Coal-bearing soil is weakened when encountering water and its strength is sharply dropped down with increasing water content. Taking coal-bearing soil which ranges along with Guang-Wu Expressway for example, and based on analyzing the physical properties of coal-bearing soil, its shear strength is measured through direct shear test; influence of water contents on shear strength of coal-bearing soil is analyzed; and some suggestions are put forward to treat coil-bearing soil. The results indicate that the shear strength and initial water content of coal-bearing soil have marked correlationship; and the bigger initial water content of coal-bearing soil is, the smaller its shear strength is. With water content increasing, cohesion of coal-bearing soil decreases overall; but its changing trend is of marked characteristic of stage. When water content of coal-bearing soil is under some value, its cohesion changes in small ranges; after water content of coal-bearing soil is over the value, its cohesion decreases with water content increasing; and the interrelationship between the logarithm of its cohesion and water content is linear. Water content of coal-bearing soil has no marked effect on its internal friction angle; but its internal friction angle firstly increases and then decreases, so it has marked peak value. |
| Keywords: | coal-bearing soil shear strength water sensitivity direct shear test |
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