基于示踪法的土石坝裂缝发育深度检测及成因分析
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摘要
根据探地雷达的检测原理,引入与土体介电常数差异较大、具有强烈反射性的示踪剂,结合探地雷达技术来检测某黏心墙土石坝裂缝的发育深度。通过对灌入示踪剂前后探地雷达检测剖面图像裂缝深度的对比分析,发现裂缝深度检测值提高了20%～50%。通过对坝体监测资料中坝体变形、库水位和裂缝开度进行相关性分析,发现土石坝正常运行情况下,坝体前后变形、水平竖向变形的不一致会引起坝体的开裂,库水位的变化是导致土石坝坝体开裂的主因。通过对坝体的裂缝发育深度的检测以及裂缝成因分析,为土石坝工程的管理和维修加固提供了科学的决策依据。
Combined with ground penetrating radar technology, we introduces a highly reflective tracer, which has a large difference in dielectric constant compared with soils, to detect the development depth of earth-rock dam cracks. Through the comparative analysis on the crack depth of GPR detection profile image before and after filling the tracer, the crack depth detection value is increased by 20% ～ 50% after the filling. Through analysis of the correlation between dam body deformation, water level and cracks opening degree of dam body monitoring data, it is found that the inconsistent deformation between front and back of the dam as well as between horizontal and vertical orientation, and the variation of water level are the cracking causes of the dam. Through detection of the crack development depth of the dam body and the cause analysis of the cracks, the crack development and causes of the earth-rock dam are grasped in time, which provides a scientific decision-making basis for the management, maintenance and reinforcement of the earth-rock dam project.
Combined with ground penetrating radar technology, we introduces a highly reflective tracer, which has a large difference in dielectric constant compared with soils, to detect the development depth of earth-rock dam cracks. Through the comparative analysis on the crack depth of GPR detection profile image before and after filling the tracer, the crack depth detection value is increased by 20% ～ 50% after the filling. Through analysis of the correlation between dam body deformation, water level and cracks opening degree of dam body monitoring data, it is found that the inconsistent deformation between front and back of the dam as well as between horizontal and vertical orientation, and the variation of water level are the cracking causes of the dam. Through detection of the crack development depth of the dam body and the cause analysis of the cracks, the crack development and causes of the earth-rock dam are grasped in time, which provides a scientific decision-making basis for the management, maintenance and reinforcement of the earth-rock dam project.
引文
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[2] 汤雷.一种裂缝深度的检测方法:中国,CN102944195[P].2013
[3] 王淼,郭秀军,孙振水,等.快速探测水库库容和淤积量的探地雷达技术[J].人民长江,2009,40(15):26-29.
[4] 高士佩,徐毅,赵钢,等.基于探地雷达隐患检测的堤防渗流数值模拟[J].人民长江,2017(s1):40-43.
[5] 高华喜,殷坤龙.降雨与滑坡灾害相关性分析及预警预报阀值之探讨[J].岩土力学,2007,28(5):1055-1060.
[6] 王淼,郭秀军,孙振水,等.快速探测水库库容和淤积量的探地雷达技术[J].人民长江,2009,40(15):26-29.
[7] 陆俊,游日,牛志国.高速地质雷达在公路隧道衬砌质量检测中的应用[J].筑路工程与施工机械化,2010,27(5):24-27.
[8] 卢成明,秦臻,朱海龙,等.探地雷达检测公路结构层隐含裂缝实用方法研究[J].地球物理学报,2007,50(5):1558-1568.
[9] 胡少伟,陆俊,王国群.地质雷达在探测地下富含水区域中的应用[J].水利水运工程学报,2012(6):1-5
[10] 洪庆仁,吴勇,卓勇,等.综合超前地质预报在大秦岭隧道中的应用[J].人民长江,2017,48(7):56-59.
[11] 秦承彬.探地雷达在隧道超前地质预报与衬砌检测中的应用研究[D].绵阳:西南交通大学:2011.
[12] 顾淦臣.土石坝的裂缝和压实质量[J].岩土工程学报,1982,4(4):56-67.
[13] 彭翀,张宗亮,张丙印,等.高土石坝裂缝分析的变形倾度有限元法及其应用[J].岩土力学,2013,34(5):1453-1458.