三峡永久船闸直立坡岩体变形监测与变形分析

众多不同类的监测仪器设备和长时间的观测资料,较全面地揭示了三峡永久船闸直立坡岩体的变形规律,在分析了大地测量点、滑动变形计、钻孔测斜仪和多点位移计的观测资料后,认为直立坡岩体整体稳定性良好.实测直立坡顶最大水平位移为32.72 mm;直立坡深层岩体的水平和竖向位移分布符合一般变形规律;统计模型分析表明,中隔墩侧直立坡岩体时效变形远小于边坡侧直立坡岩体;微新岩体上测点的时效变形小于强风化岩体上的测点.此外,北坡三闸首的观测成果说明,在槽挖结束后的第5个月开始浇筑混凝土是合理的.

Deformation monitoring and analysis of rock mass behind vertical slope at TGP's permanent shiplock

Long-time observed data obtained by using various kinds of monitoring instrument all-sidely reveal the rockmass deformation law of the vertical slopes of the Three Gorges permanent shiplocks. Through analyzing the observed data obtained at geodetic survey points and by using sliding deformation gauges, borehole inclinometers and multi-point displacement meters, the integral stability of the rockmass of the vertical slopes is considered to be good. The observed maximum horizontal displacement at the top of the vertical slopes is 32.72 mm, and the distribution of horizontal and vertical displacement of deep-layer rockmass of the vertical slopes conforms to general deformation law. Analysis by using a statistic model shows that the time-effect deformation of the rockmass of the middle separating wall's vertical slopes is much less than that of the left and right side vertical rock slopes , and that the time-effect deformation at the observation points on slightly-weathered and fresh rockmass is less than that of the observation points on strongly weathered rockmass. In addition, the observed results of the north-slope No. 3 lockhead show that starting to place concrete there 5 months after finishing the rock excavation of the lock chamber channel is reasonable.