| 钙质土颗粒咬合作用机制 |
| |
| 引用本文： | 王新志,翁贻令,王星,陈伟俊.钙质土颗粒咬合作用机制[J].岩土力学,2018,39(9):3113-3120. |
| |
| 作者姓名： | 王新志 翁贻令 王星 陈伟俊 |
| |
| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071； 2. 广西大学 海洋学院，广西 南宁 530004；3. 中国科学院大学，北京 100049 |
| |
| 基金项目： | 自然科学基金面上項目（No. 41572297，No.41372318）；中国科学院战略性先导科技专项（A类）资助（No.XDA13010203）。 |
| |
| 摘 要： | 形状不规则的钙质土在剪切应力作用下土颗粒之间存在咬合作用，从而使抗剪强度显著提高。为研究钙质土颗粒的咬合作用机制，针对不同粒径的钙质土开展三轴固结不排水和固结排水试验，并对颗粒形状进行了分析，揭示了钙质土咬合力的形成机制和表现形式。研究表明：①不规则的颗粒形状是钙质土产生咬合力的前提条件；②在不同粒径的钙质土中，因不同形状颗粒的含量存在差异导致咬合力大小也不同；③咬合力大小受应力水平影响较为明显，在低围压下咬合作用导致剪胀而提高内摩擦角；在高围压下咬合作用克服颗粒强度做功，造成颗粒破碎，提高黏聚力值而降低有效内摩擦角。钙质土颗粒之间的咬合对强度有明显增强作用，在工程设计中应充分考虑咬合力的影响。
|
| 关 键 词： | 钙质土 抗剪强度 颗粒咬合 剪胀 颗粒破碎 |
| 收稿时间： | 2017-12-05 |
Interlocking mechanism of calcareous soil |
| |
| WANG Xin-zhi,WENG Yi-ling,WANG Xing,CHEN Wei-jun.Interlocking mechanism of calcareous soil[J].Rock and Soil Mechanics,2018,39(9):3113-3120. |
| |
| Authors: | WANG Xin-zhi WENG Yi-ling WANG Xing CHEN Wei-jun |
| |
| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. School of Marine Sciences, Guangxi University, Nanning, Guangxi 530004, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | The interlocking effect of calcareous soil due to irregular particle shapes increases the shear strength markedly under shearing. To investigate the interlocking mechanism of calcareous soil, a series of triaxial tests was carried out for different particle sizes under consolidated undrained and consolidated drained conditions. Particle shape analysis was also conducted to reveal the formation mechanism and manifestation of occlusal force of calcareous soil. The test results show that: 1) irregular shape is the prerequisite for the occlusion of calcareous soil particles; 2) the difference in the content of particles for different shapes in calcareous soil with different particle sizes results in different values of occlusal force; 3)the occlusal force of calcareous soil is obviously affected by the stress level. Under low confining pressure, the occlusal action causes dilatancy and increases the internal friction angle. Conversely, under high confining pressure, the occlusal action causes particle breakage, raises cohesion, but reduces the internal friction angle. The occlusion of calcareous soil has obvious enhancement on the strength. Therefore, the occlusion of calcareous soil should be considered in engineering design work of coral reef. |
| |
| Keywords: | calcareous soil shear strength particle occlusion shear dilation particle breakage |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
