基于微震监测的大岗山高拱坝坝踵蓄水初期变形机制研究

发布时间：2018-05-27 05:17

本文选题：岩石力学 + 高拱坝　；参考：《岩石力学与工程学报》2017年05期

【摘要】：混凝土高拱坝坝踵是蓄水初期阶段拱坝安全的重点关注部位。通过构建国内首套高拱坝坝踵微震监测系统,实现对蓄水初期阶段大岗山拱坝坝踵区微破裂的实时监测,探究坝踵蓄水初期变形机制及其与微震活动性的关系。采用人工敲击试验确定坝踵等效P波波速为4 300 m/s,系统定位误差小于8 m。对系统获取的事件波形进行噪声滤除,并在自动定位基础上进行人工二次校核,提高定位精度,验证了微震监测技术应用于大体积混凝土工程的可行性。分析认为:蓄水初期阶段,大岗山高拱坝坝踵区微震活动性与库水位密切相关,微震事件聚集区实现从坝踵向坝趾的转移,坝踵压缩变形减小,而坝趾区变形量增加。此外,通过拱坝坝踵区微震变形演化过程,揭示了导流洞下闸蓄水前940 m高程基础廊道拱顶裂缝产生的根本诱因。研究成果可为混凝土高拱坝微震监测和真实工作性态研究提供参考。
[Abstract]:The heel of concrete high arch dam is the key focus of the safety of arch dam in the initial stage of water storage. Through the construction of the first domestic high arch dam heel microseismic monitoring system, the real time monitoring of the micro fracture in the heel area of Dagangshan arch dam in the initial stage of the impoundment is realized, and the relationship between the deformation mechanism of the dam heel and its microseismic activity in the early stage of the dam heel is explored. The shock test confirms that the equivalent P wave velocity of the heel of the dam is 4300 m/s and the system positioning error is less than 8 M. to filter the event waveform obtained by the system, and the manual two checks are carried out on the basis of automatic positioning to improve the positioning accuracy, and the feasibility of the application of microseismic monitoring technology to the mass coagulation soil engineering is verified. The microseismic activity of the dam heel area of the Dagangshan high arch dam is closely related to the reservoir water level. The microseismic event gathering area is transferred from the dam heel to the dam toe, and the deformation of the dam heel decreases, and the deformation of the dam toe area is increased. In addition, the arch roof crack of the 940 m elevation foundation corridor before the impoundment of the diversion tunnel is revealed through the evolution process of the microseismic deformation in the heel area of the arch dam. The research results can provide references for the study of microseismic monitoring and real work behavior of concrete high arch dams.
【作者单位】：大连理工大学岩石破裂与失稳研究中心;清华大学水沙科学与水利水电工程国家重点实验室;国电大岗山水电开发有限公司;
【基金】：国家自然科学基金资助项目(51504233) 国家重点基础研究发展计划(973)项目(2014CB047100) 中央高校基本业务费(DUT15YQ106)~~
【分类号】：TV698.13

【相似文献】