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上第三系膨胀岩在南水北调中线工程总干渠黄羑段沿线的累计分布长度约36km,其胀缩变形、崩解等特性影响总干渠渠基和渠道衬砌的稳定,且其膨胀潜势的不均匀性、无规律性给工程设计和工程处理造成了不便。文章通过对沿线上第三系膨胀岩的野外分布特征及室内试验资料分析,对膨胀岩的膨胀潜势强弱进行划分,为工程设计和处理提供参考依据。
The accumulated length of the Tertiary expansive rock along Huangmao section of the main canal of the Middle Route Project of South-to-North Water Diversion Project is about 36km in length. Its characteristics such as expansion and shrinkage deformation and disintegration affect the stability of canal foundation and canal lining of the main canal and its expansion potential Uniformity and irregularity cause inconvenience to engineering design and engineering. By analyzing the field distribution characteristics and indoor test data of Tertiary expansive rocks along the line, the paper divides the expansive potential of expansive rock and provides a reference for engineering design and treatment.