新疆呼图壁河青年渠首坝体稳定监测与分析

Dam body stability observation and analysis at Qingnian canal head in Hutubi river basin of Xinjiang

为了解新疆呼图壁青年渠首改造后坝体稳定性,采用坝坡和深部位移监测的方法,探究坝坡和边坡体深部、滑带的位移情况及变化规律。结果表明:3个表面测点x、y、z方向的位移较小,尤其是经过5次监测后,其位移不到1 mm;4个测斜孔位移的总体变化趋势基本一致,其最大位移分别发生在距坡面9.5、12.2、5.7、12.8m处,A、B方向位移均随深度的增加而降低,但A方向变形量较B方向要大,即主要沿下游方向发展;深部位移变形量相对较小;坝体失稳的可能性极小。

In order to investigate the stability of dam body at Qingnian canal head in Hutubi river basin of Xinjang, dam slope and deep displacement monitoring was conducted to observe the displacement and change rule. The results demonstrate that displacement at three surface monitoring positions in x, y and z directions is little, less than lmm after 5 times of monitoring; the displacement at four inclined monitoring holes have a basically identical change trend, with the maximum displacement respectively occurred at depth of 9.5m, 12.2m, 5.7m and 12.8m from the slope surface; displacement decreases with the increase of depth in both direction A and B, but displacement in direction A is greater than that in direction B, indicating that displacement mainly developing along downstream direction; displacement at deep positions is relative smaller; the probability of dam instability is minimal.