新技术在潭岭水库隐患排查安全检测中的应用研究

Application of New Technology in Dam Safety Detection of Tanling Reservoir

大量的研究和应用表明,物探方法的无损检测方式在水库安全鉴定和除险加固工程质量全面检测中能起到很好的检测效果。但由于单一的物探方法和技术都有一定的局限性,对水库的鉴定和质量检测的深部裂隙和渗漏等关键数据难以进行定量分析。该文进行了高密度电法、全方位电法和水坝电性渗漏检测法在潭岭水库拦河坝安全检测中的应用研究。研究表明,高密度电法在浅层处可以有效的应用,从约12m以下发现多处电阻率低阻异常形态,推断为水坝混凝土已有较严重的腐蚀,但深部反演数据的电阻率异常,存在技术方法的局限性。通过探测精度为常规物探方法3倍的全方位电法进行了拦河坝底部的检测,在泄洪洞上部低阻异常的部位,推断有较深的裂隙,混凝土存在较严重的腐蚀。水坝电性渗漏检测法显示拦河坝有4处电性异常,在距泄洪洞约4m的距离处的电性异常最大,推断水坝长期使用出现了局部渗漏的情况。通过将传统的物探方法和新的物探方法在水库安全检测中进行尝试性研究,可充分发挥新技术的技术优势,实现全面、有效和精确地检测成果。

There have been a lot of researches and applications on the geophysical explorations,which show that the comprehensive testing of reservoir safety appraisal and the quality of reinforcement can play a very good detection effect.But due to the limitations of single geophysical methods and techniques,it is difficult to quantitatively analyze the reservoir dam of the fissures and leakage in the identification and the quality detection.In this paper,the application of the Electrical Resistivity Tomography,the New Borehole-to-Surface Electrical Resistivity Tomography and the Water Leakage Electrical Detection in dam safety detection of Tanling Reservoir is studied.The results show that the Electrical Resistivity Tomography can be effectively applied in shallow part.Several low resistivity anomalies are found below 12 m.It is inferred that dam concrete has been corroded seriously.But the resistivity anomalies of deep inversion data have limitations of technical methods.The bottom of the dam is detected by the New Borehole-to-Surface Electrical Resistivity Tomography,which has a detection accuracy of 3 times that of the Direct Current Electric Method.It is inferred that there are deep cracks and serious corrosion in concrete at the low resistivity abnormal part of the upper part of the spillway tunnel.The Water Leakage Electrical Detection shows that there are four electrical anomalies in the dam,and the electrical anomalies are the greatest at the distance of about 4 m from the spillway tunnel.It is inferred that local leakage occurs in the long-term use of the dam.The new geophysical methods are tentatively studied in the reservoir dam safety detection,which can give full play to the technical advantages,effective and accurate detection results.