关于水电站工程区探硐封堵质量检测方法探讨与应用

Discussion and application of quality inspection methods for exploratory tunnel sealing in hydropower station engineering Area

水电站工程因前期勘察的需要,在坝址区、厂房区会布置一定数量的探硐,部分探硐与地下建筑物连通或穿越防渗帷幕线和坝基固结灌浆区。在施工过程中,所有探硐均需进行封堵,其中大坝建基面附近及帷幕防渗部分探硐封堵质量对工程安全质量尤其关键。因此,对关键部位探硐封堵质量的检测,是关系到整个水电站后期安全运行的重要因素。这里以溪洛渡水电站工区探硐封堵质量检测工程实践为例,根据帷幕灌浆区、固结灌浆区不同的设计要求,针对性运用钻孔压水、试验钻孔全景图像、钻孔单孔声波及芯样强度抗压试验检测方法进行质量检测。通过上述综合检测方法获取了硐室封堵段各项质量评价指标,从而进一步消除安全隐患,对类似工程问题具有借鉴意义。

In hydropower plants,several cavities are placed in the dam site and plant area,some of which are connected to underground buildings or cross the seepage curtain line and dam foundation consolidation grouting area.During the construction process,all cavities are sealed according to the design requirements,especially near the dam's foundation and the curtain wall.Therefore,testing the quality of the cavities is an essential factor for the safe operation of the hydropower plant.In this paper,we use the Xiluodu hydropower plant as an example of the quality testing of the refuge blocking process and use a combination of borehole piezometric,test borehole panoramic image,single-hole acoustic,and core sample compressive testing methods to test the quality of the refuge blocking process.The above-mentioned comprehensive testing methods were used to obtain the quality evaluation indexes of the blocked section of the chamber and to eliminate the safety hazards by reprocessing,which is of reference for similar engineering problems.