三峡永久船闸一期高边坡监测锚杆应力分析

Analysis of first?stage monitoring anchor bar stress on high slope of TGP permanent lock during operation

为监测三峡永久船闸一期高边坡运行期岩体锚固效果,在部分断面的锚杆上安装了锚杆应力计。监测结果为:32根监测锚杆中,拉应力大于30MPa的有3支;压应力大于30MPa的有4支;其余锚杆应力计测值绝对值均小于20MPa,绝大部分锚杆应力基本稳定。这表明边坡锚杆受力不大。对"变形应力为主型"锚杆应力测值统计模型分析得出,近3年的趋势分量增量分别为2.34,1.85,1.53MPa,也说明监测锚杆处的高边坡岩体已趋于稳定。

For monitoring the effects of anchorage of the anchor bars buried in the high slope of TGP permanent lock, 32 anchor stress?meters were installed in partial cross?soctions. Among them, the tensile stress in 3 instruments was over 30 MPa, the pressure stress in 4 instruments more than 30 MPa, and the absolute values of the rest were lower than 20 MPa. The monitoring results show that most of anchor bar stresses are stable basically and the stresses in anchor rods small. A statistics model was established by analyzing superposition streses caused by deformation and by temperature. It was concluded from analysis that the increments of trend component in recent 3 years were (2.34 MPa), (1.85 MPa) and (1.53 MPa),respectively. These data indicate that the deformation of the high slope with anchor bars tends towards stability.