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GEOTECHNICAL INVESTIGATIONS AT MARTIS CREEK DAM, TRUCKEE, CA

机译：加利福尼亚TRUCKEE的MARTIS CREEK DAM的岩土工程勘察

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Martis Creek Dam was constructed by the U. S. Army Corps of Engineers in 1972 for flood control and potential water supply. Initial geotechnical investigations identified potential seepage issues and the dam was constructed according to accepted practices at the time with measures to mitigate those issues. During subsequent test fillings of the lake, significant seepage developed beneath the left abutment of the dam and on the hill side downstream of the dam. This is understood to be due to groundwater flow through coarse glacial deposits beneath the dam's foundation. In 2007, the US Army Corps of Engineers began a series of subsurface investigations of the dam and vicinity to improve knowledge of the geology. The investigations used conventional drilling as well as geophysical techniques to expand subsurface knowledge. A marker bed in the Prosser Creek Formation locally referred to as the "Blue Silt" was used to tie in observations from across the site. A synthesis of the borehole and geophysical data has permitted a refinement in the understanding of the groundwater flow beneath the dam. Data indicates the presence of a paleochannel eroded into the Prosser Creek Formation filled with coarse glacial outwash deposits beneath the left abutment. This channel is suspected of being the major seepage pathway beneath the dam's left abutment. Investigations have also improved the knowledge and definition of a recently discovered transform fault that passes between the dam and the spillway.
机译：马蒂斯溪大坝是由美国陆军工程兵部队于1972年建造的，用于防洪和潜在的供水。最初的岩土工程调查确定了潜在的渗水问题，并根据当时公认的惯例建造了大坝，并采取了缓解这些问题的措施。在随后的湖水充填测试中，大坝左支座下方和大坝下游的山坡上出现了明显的渗流。据了解，这是由于地下水流经大坝基础下方的粗大冰川沉积物。 2007年，美国陆军工程兵团开始对大坝及其附近地区进行一系列地下调查，以提高对地质的了解。调查使用常规钻探和地球物理技术来扩展地下知识。在Prosser Creek地层中的一个标记床，在当地被称为“蓝色淤泥”，用于结合来自整个站点的观测资料。钻孔和地球物理数据的综合，使人们对了解大坝下方的地下水流有了进一步的了解。数据表明存在一条侵蚀进入Prosser Creek地层的古河道，在左桥台下方充满了粗糙的冰川冲积物。该水渠被怀疑是大坝左坝肩下方的主要渗水通道。调查还提高了最近发现的在大坝和溢洪道之间通过的变形断层的知识和定义。

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