Geotechnical Design And Construction Issues For Guanella Dam, Near Empire, Colorado

机译：科罗拉多州帝国附近的瓜纳拉水坝的岩土工程设计和施工问题

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Guanella Dam is a new 34-foot (10-meter) high, zoned earthfill embankment dam completed in the fall of 2003 and put into service in 2004. The dam was designed and constructed using a fast-track approach to meet water needs of the City of Golden. The dam is located near Empire, CO at the site of a previous aggregate quarry operation. The off-channel reservoir created by the dam will impound a water supply of about 2,140 acre-feet (2.64 million cubic meters). Several unique site conditions presented interesting geotechnical challenges that had to be overcome to develop a successful project. The site stratigraphy varied significantly over short distances, and the dam alignment was carefully selected to take advantage of a high ridge in a low permeability silt layer. On-site soils had to be carefully evaluated to allow for economic development of embankment materials. Because ground water was very shallow, a soil-bentonite seepage barrier wall through a foundation sand and gravel layer was selected to connect the embankment Zone 1 core to the foundation silt layer. The barrier wall was constructed using slurry trench methods. Finally, the highly pervious sand and gravel deposits in the quarry area extended away from the reservoir, beneath the adjacent creek. The seepage barrier wall beneath the dam had to be extended across the adjacent creek valley through these deposits to limit reservoir leakage. However, to allow for expedited permits, the valley cutoff wall had to include two "windows" to avoid working in the creek or in the embankment of adjacent US Highway 40. Seepage analyses were completed to verify that the partial valley cutoff wall would produce acceptable leakage rates.

机译：Guanella大坝是34英尺（10米）高的新型带分区填土路堤，于2003年秋季完工，并于2004年投入使用。该大坝的设计和建造采用了快速通道的方法，可以满足大坝的水需求。金城。该大坝位于先前的集料采石场所在的科罗拉多州帝国附近。大坝造成的河道外水库蓄水约2140英呎-英尺（264万立方米）。几个独特的工地条件提出了有趣的岩土工程挑战，开发一个成功的项目必须克服这些挑战。场地地层在短距离内变化很大，并且仔细选择了坝的走向以利用低渗透性淤泥层中的高脊。必须仔细评估现场土壤，以使路堤材料经济发展。由于地下水非常浅，因此选择了穿过基础砂砾层的土壤-膨润土防渗墙，以将路堤1区的岩心连接至基础淤泥层。阻挡壁是使用浆料沟槽法构造的。最后，采石场区域中高度渗透的沙子和砾石沉积物远离水库，延伸到相邻小河的下方。大坝下方的防渗墙必须通过这些沉积物穿过相邻的溪谷，以限制水库的渗漏。但是，为了获得快速许可，山谷防渗墙必须包括两个“窗户”，以避免在小溪或相邻的US Highway 40的路堤中工作。渗流分析已完成，以验证部分山谷防渗墙会产生可接受的效果。泄漏率。

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《Geotechnical Practice Publication no.2; Biennial Denver Geotechnical Symposium; 20041022; Denver,CO(US)》|2004年|P.14-27|共14页
会议地点 DenverCO(US)
作者
John W. France; Steve Jamieson; Paul Perri;
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URS Corporation, 8181 East Tufts Avenue, Denver, Colorado, 80237;

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原文格式 PDF
正文语种 eng
中图分类水利工程施工;
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Geotechnical Design And Construction Issues For Guanella Dam, Near Empire, Colorado

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