摘要
为提高施工期土石坝沉降安全性,研究其具有复杂非线性特征的施工期沉降规律和相应的预警标准。基于国内某在建高土石坝的沉降数据,采用R/S法分析坝体不同高程测点、同高程测点和同测点不同时期沉降数据的Hurst指数及分形维数,提出评价坝体施工期沉降安全性的预警标准。结果表明:各测点的Hurst指数最小值为0.763,坝内各处沉降仍处于快速增长阶段;坝体下部比上部、中部比下游堆石区沉降能更快趋于稳定,且坝体下部的沉降速率已经渐趋平缓。
In order to improve the settlement safety of earth-rock dam during construction, the complex non-linear settlement regularity and the corresponding warning standard were studied. Based on settlement data of a certain domestic high earth-rock dam in construction, applying R/S method, Hurst index and fractal dimension of the settlement data from different elevation points, the same elevation points and the same point in different periods were analyzed, warning standard to evaluate settlement safety during construction was proposed. The results show that the minimum Hurst index is 0. 763, and dam settlement is still in the fast growth stage; the settlement in dam bottom can tend to be stable faster than the upper, also the middle than the downstream rock-fill area, and dam settlement rate in bottom has been gradually gentle.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2012年第8期164-170,共7页
China Safety Science Journal
基金
国家创新研究群体科学基金资助(51021004)
