【摘要】 土石坝填筑材料长期在水动力作用下易产生异常渗流现象,对病险山塘实施地质勘察是防渗方案优化设计的前提。鉴于对大坝渗漏病害的分布及诱因不明,钻孔的布置只能依据规范而定,却忽视了查漏的初衷,提出一种综合性、分阶段的大坝勘察技术。以胜岭脚山塘渗漏探测为例,利用电阻率探测技术圈定大坝病患的主要部位,并对渗流薄弱区进行钻孔注压水试验,进一步结合钻孔电视成像技术对孔壁大坝填筑质量进行分析。结果表明,电阻率成像技术可准确查明病害区的分布,孔内成像可直观反映钻孔岩土体的原状赋存特征,综合检测技术可有效解决大坝渗漏病症不清的难题,为除险加固勘察提供了新的思路。更多还原

【Abstract】 The earth-rock dam filling materials are prone to generate abnormal seepage phenomenon under longterm hydrodynamic action,and implementing geological survey on dangerous small reservoir is the optimal design prerequisite of anti-seepage scheme. In view of the unknown distribution and incentives of dam leakage diseases,the arrangement of the drill holes can only be determined in the light of specifications. However,the original intention of leak detection is ignored. Therefore,a comprehensive and phased dam survey technique was proposed. By taking Shenglingjiao small reservoir survey for example,electrical resistivity tomography was applied to measure weakness part. According to the results of the injection water test in the hole,and further downhole television to the hole-wall,the problem of poor quality and easy collapse of the dam was revealed. The results show electrical resistivity tomography can quickly identify disease areas,and borehole televiewer can directly reflect the original occurrence characteristics of borehole rock and soil mass. Combined with the targeted arrangement of the electrical resistivity tomography and the borehole televiewer technique,the hard problem of unclear illness is avoided,which provides a new idea for the survey of danger removal and reinforcement.更多还原