| 石灰改良红层无侧限抗压强度试验研究 |
| |
| 引用本文： | 周宇,李国玉,武红娟,穆彦虎,赵文斌,毛云程.石灰改良红层无侧限抗压强度试验研究[J].冰川冻土,2021,43(2):535-543. |
| |
| 作者姓名： | 周宇 李国玉 武红娟 穆彦虎 赵文斌 毛云程 |
| |
| 作者单位： | 中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;中国科学院大学,北京100049;中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;中国科学院大学,北京100049;中国科学院西北生态环境资源研究院大兴安岭冻土工程与环境观测试验研究站,黑龙江加格达奇165000;西北民族大学,甘肃兰州730030;中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000;甘肃民航机场集团有限公司,甘肃兰州730020 |
| |
| 基金项目： | 甘肃省交通运输厅科技项目(201600009);NSFC-新疆联合基金项目(U1703244);国家自然科学基金项目(41672310);甘肃省科技重大专项(143GKDA007);国家重点研发计划项目(2017YFC0405101) |
| |
| 摘 要： | 红层是一种特殊岩土，作为路基材料时，常会导致不均匀沉陷、翻浆冒泥等病害。为改善其力学性质，工程上通常掺入一定剂量的石灰（Ca（OH）2）进行改良。由于降水-蒸发的周期性变化，运营期间反复干湿循环作用对路基土的工程性质造成较大影响。基于此，结合室内无侧限抗压强度试验，研究了干湿循环作用对不同掺量的石灰改良红层无侧限抗压强度的影响。结果表明：在最佳含水率下，石灰改良红层的无侧限抗压强度随石灰掺量的增加而增大；干湿循环作用对改良红层无侧限抗压强度的影响与石灰掺量有关，石灰掺量较低时，改良红层的抗压强度随干湿循环次数的增加而减小，石灰掺量较高时，改良红层的无侧限抗压强度随干湿循环次数的增加而显著增大；未改良红层塑性较大，试样均为塑性鼓胀破坏，掺入石灰后，红层强度增大，脆性增强，呈脆性剪切破坏，经历干湿循环作用后，石灰改良红层试样呈多缝锥形破坏。
|
| 关 键 词： | 红层 干湿循环作用 石灰改良红层 无侧限抗压强度 |
| 收稿时间： | 2019-12-21 |
| 修稿时间： | 2020-04-22 |
Experimental study on the unconfined compressive strength of lime stabilized red-mudstone |
| |
| ZHOU Yu,LI Guoyu,WU Hongjuan,MU Yanhu,ZHAO Wenbin,MAO Yuncheng.Experimental study on the unconfined compressive strength of lime stabilized red-mudstone[J].Journal of Glaciology and Geocryology,2021,43(2):535-543. |
| |
| Authors: | ZHOU Yu LI Guoyu WU Hongjuan MU Yanhu ZHAO Wenbin MAO Yuncheng |
| |
| Abstract: | Red-mudstone is a kind of special soil. When the weathering red-mudstone was used as the filling materials，lots of engineering problems appeared， such as the uneven settlement， the lower bearing capacity and shoulder of road gushing， etc. In order to improve its mechanical properties， a certain amount of lime （Ca（OH）2） is usually added in engineering. However， the cyclic drying and wetting during operation has a great influence on the engineering properties of roadbed soil due to periodic variation of rainfall and draught. A series of unconfined compression tests were conducted to study the influence of wetting-drying cycle on the unconfined compressive strength of the stabilized red-mudstone with different content of lime. The test results show that the unconfined compressive strength of the stabilized red-mudstone increases with the increase of the content of lime. The influence of wetting-drying cycle on the unconfined compressive strength of the stabilized red-mudstone is related to the content of lime. When the content of lime is low， the compressive strength of the stabilized soil decreases with the increase of the number of wetting-drying cycles. When the content of lime is high， the unconfined compressive strength of the stabilized soil increases significantly with the increase of the number of wetting-drying cycles. The destruction model of untreated red-mudstone specimens is plastic bulging failure. Due to the increase of soil strength and brittleness， the lime stabilized red-mudstone specimens show brittle shear failure. After the wetting-drying cycle， the destruction model of lime stabilized red-mudstone specimens is cone-shape failure. |
| |
| Keywords: | red-mudstone wetting-drying cycle lime stabilized red-mudstone unconfined compressive strength |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《冰川冻土》浏览原始摘要信息 |
| 点击此处可从《冰川冻土》下载免费的PDF全文 |
