某碾压混凝土重力坝坝基扬压力监测成果分析

Analysis on monitoring results of foundation uplift pressure of a RCC gravity dam

为了解某碾压混凝土重力坝运行多年后出现坝基扬压力较高的原因并及时采取相应的措施,对该坝近几年坝基扬压力的安全监测资料进行了整理、分析和安全评价。借助渗压计和量水堰的监测数据,从扬压力系数、开合度、扬压力分布及变化等方面,分析了造成坝基扬压力较高的诸多原因,并提出通过新增排水孔的措施及时降低坝基扬压力。监测结果表明:采取相关措施后,总体上,该坝工作状态良好,坝基扬压力的升高未对大坝安全造成影响。

The foundation uplift pressure of a RCC gravity dam is becoming large after years of operation. To timely take ap- propriate measures, the RCC gravity dam safety monitoring data of the uplift pressure in recent years were reviewed, analyzed and evaluated. The causes for the high foundation uplift pressure were analyzed in terms of uplift pressure coefficient, openings, uplift pressure distribution and variation by using the monitoring data of osmometer and measuring weir, and the measures of increasing drainage holes to lower the foundation uplift pressure in time were put forward accordingly. After taking a series of measures, the gravity dam was in safe condition, and the elevation of foundation uplift pressure did not affect the dam safety from the overall perspective.