| 渗漏溶蚀作用下碾压混凝土层(缝)面抗剪强度衰减规律试验研究 |
| |
| 引用本文： | 孔祥芝,陈改新,李曙光,纪国晋.渗漏溶蚀作用下碾压混凝土层(缝)面抗剪强度衰减规律试验研究[J].水利学报,2017,48(9):1082-1088. |
| |
| 作者姓名： | 孔祥芝 陈改新 李曙光 纪国晋 |
| |
| 作者单位： | 中国水利水电科学研究院 流域水循环模拟与调控国家重点实验室, 北京 100038;北京中水科海利工程技术有限公司, 北京 100038,中国水利水电科学研究院 流域水循环模拟与调控国家重点实验室, 北京 100038;北京中水科海利工程技术有限公司, 北京 100038,中国水利水电科学研究院 流域水循环模拟与调控国家重点实验室, 北京 100038;北京中水科海利工程技术有限公司, 北京 100038,中国水利水电科学研究院 流域水循环模拟与调控国家重点实验室, 北京 100038;北京中水科海利工程技术有限公司, 北京 100038 |
| |
| 基金项目： | 国家重点基础研究发展规划（2013CB035901）；国家十三五计划（2016YFB0303601-3）；国家自然科学基金项目（51409284）；流域水循环模拟与调控国家重点实验室项目（2016TS10，SKL2017CG05） |
| |
| 摘 要： | 采用硝酸铵溶液循环浸泡的方式加速并模拟碾压混凝土层(缝)间渗漏溶蚀过程,应用直剪法测试抗剪强度,研究了溶蚀对混凝土层(缝)面抗剪强度的影响。结果表明,碾压混凝土层(缝)间渗漏溶蚀沿着缝面的法向逐渐向两侧混凝土的内部延伸,缝面溶蚀深度,即溶蚀前锋线至缝面的距离,用酚酞指示剂+电子探针线扫描技术测定,与钙离子累计溶出量呈线性关系,可以定量表征溶蚀程度。渗漏溶蚀引起缝隙两侧混凝土的孔隙率增大,微观结构变差,混凝土层(缝)面摩擦系数、黏聚力下降,但下降速率逐渐降低,衰减规律遵循牛顿冷却定律。试验数据拟合表明,基于牛顿冷却定律建立的以缝面溶蚀深度为自变量的抗剪强度衰减模型能够很好地反映碾压混凝土层(缝)面抗剪强度变化规律。
|
| 关 键 词： | 碾压混凝土 层间 缝隙 渗漏溶蚀 抗剪强度 衰减 |
| 收稿时间： | 2017/3/5 0:00:00 |
Studies on the decreasing rule of the anti-shearing strength along RCC joints (cracks) subjected to leaching |
| |
| KONG Xiangzhi,CHEN Gaixin,LI Shuguang and JI Guojin.Studies on the decreasing rule of the anti-shearing strength along RCC joints (cracks) subjected to leaching[J].Journal of Hydraulic Engineering,2017,48(9):1082-1088. |
| |
| Authors: | KONG Xiangzhi CHEN Gaixin LI Shuguang and JI Guojin |
| |
| Institution: | China Institute of Water Resources and Hydropower Research State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China;Beijing IWHR-KHL Co., LTD, Beijing 100038, China,China Institute of Water Resources and Hydropower Research State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China;Beijing IWHR-KHL Co., LTD, Beijing 100038, China,China Institute of Water Resources and Hydropower Research State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China;Beijing IWHR-KHL Co., LTD, Beijing 100038, China and China Institute of Water Resources and Hydropower Research State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China;Beijing IWHR-KHL Co., LTD, Beijing 100038, China |
| |
| Abstract: | The evolution of anti-shearing strength along the joints (cracks) in roller-compacted concrete (RCC) subjected leaching is studied in this paper. The leaching process is accelerated and simulated by im-mersing RCC specimens in ammonium nitrate solution. The results show that the leaching process is devel-oped perpendicularly to the cracking plane gradually. The leaching depth can be measured by phenolphtha-lein indicator together with electron probe line scanning. The porosity of RCC in both sides of the joints (cracks) increases and the microstructure becomes loose. The friction of RCC along the joints (cracks) as well as the cohesion force decreases with the increase of the leaching time. The evolution of the anti-shear-ing strength of RCC joints (cracks) surface can be fitted by Newtonian cooling law. |
| |
| Keywords: | roller-compacted concrete joints cracks leakage and leaching anti-shearing strength de-crease |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《水利学报》浏览原始摘要信息 |
| 点击此处可从《水利学报》下载免费的PDF全文 |
|
