Fly Ash Reducing the Permeability of Soil-Cement Mixture for the Application of Seepage Cutoff
Fly Ash Reducing the Permeability of Soil-Cement Mixture for the Application of Seepage Cutoff
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DOI：
10.1061/47625(404)19
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发表时间：
2011-05
期刊：
影响因子：
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通讯作者：
D. Chang;Wen-Chuan Lee;Lillian Guo;Kai Yang
中科院分区：
文献类型：
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作者：
D. Chang;Wen-Chuan Lee;Lillian Guo;Kai Yang
桃园国际机场捷运系统集埔车厂正在施工中。由于新街河的渗透，防洪墙下须设计一个截水系统，以防止邻近新街河的渗透造成的隆起和管涌。由于地下存款（原地土壤存款被归类为GP-GM）中存在大尺寸的卵石，因此典型的现浇防渗墙或水泥深层土壤搅拌将非常困难。为克服这些困难，提出了加宽浅截水沟与现拌水泥土相结合的设计方案。根据试验结果，应指出替代设计的两个优点。首先，土壤通过添加水泥的胶凝粘结获得更高的强度。第二，通过掺入粉煤灰，渗透性从k = 3.58 × 10- 5cm/sec降低到k = 1.03 × 10- 7 cm/sec。建议水泥掺量为7，粉煤灰掺量为15%的配合比设计。同时，替代设计的成本明显低于原始设计。
Chi-Pu depot of Taoyuan International airport MRT system is under construction. River, a cutoff system is required to be designed underneath the flood wall to prevent uplift and piping caused by seepage flow from the adjacent Shin-Jie river. Due to large size cobbles found in the subsurface soil deposit (in-situ soil deposit is classified as GP-GM), the typical cast-in-place cutoff wall or cement deep soil mixing will be very difficult. To overcome such difficulties, an alternative design of widen and shallow cutoff trench combining with mixed-in-place soil cement is proposed. Based on test results, two benefits should be pointed out for the alternative design. First, the soil gains higher strength through the cementitious bonding by adding cement. Second, the permeability was reduced from k = 3.58 × 10-5 cm/sec to k = 1.03 × 10-7cm/sec by adding fly ash. The proposed mix design for cement content is 7 ,and fly ash content is 15%. Simultaneously, the cost for alternative design is significantly lower than the original designs.