广州市梅州水库土坝险情原因分析与加固处理OA

In 2012,the water level of the Meizhou Reservoir in Guangzhou City dropped below the dead water level,and more serious damage to earth dam occurs during the precipitation process:Staggered settlement and fracture cracks were found on the concrete slope protection upstream of the main dam,and the structural joints along the dam axis were opened on the concrete pavement at the dam crest.It is considered that the internal factors of dangerous situation are the loose and uneven soil of the dam body,the incomplete foundation cleaning and the existence of soft soil layer,the unfavorable topographic and geological conditions of the left dam section,etc.,the dangerous situation was induced by the external factor that the water level of the reservoir was continuously lowered to the lowest level since the construction of the reservoir.On the basis of the latest investigation results,the anti-slide stability of the upstream slope of the earth dam was analyzed.It was found that the factor of safety was greater than 1 under all working conditions,but under the condition that the water level of the reservoir fell very much,the anti-slide stability factor of safety of the upstream dam slope of the left dam section is less than the minimum value of 1.20 required by the code.Therefore,a new counter-weight platform is built at the dam base,which makes the minimum factor of safety of anti-slide of the dam slope 1.22,and the crack at the dam top is excavated and backfilled.