ترجمه مقاله نقش ضروری ارتباطات 6G با چشم انداز صنعت 4.0
- مبلغ: ۸۶,۰۰۰ تومان
ترجمه مقاله پایداری توسعه شهری، تعدیل ساختار صنعتی و کارایی کاربری زمین
- مبلغ: ۹۱,۰۰۰ تومان
Trench Remixing and Deep wall method (TRD) developed in Japan was recently used to construct two demonstration test cells at a site in Long Beach, California. Seawater intrusion occurs through a shallow aquifer of 30 meters in depth, which fouls the fresh water supply aquifers farther inland. The physical cutoff wall concept calls for a soil mix wall constructed into the underlying aquifer, and spanning the 3.5- kilometer length of the gap. During design, hydrogeologic evaluation indicated variability in the aquitard beneath the shallow aquifer; therefore, test cells to depths of 20 and 24 meters were utilized to assess seepage under the wall with respect to wall depth. Testing of 5 different soil-mixes indicated a slag-cement-sepiolite-soil mix as optimal for field application that could achieve a permeability of 1x10-6 cm/sec or less in the saline environment. Use of the TRD method to construct the test cells proved to be effective at producing a homogeneous soil-sepiolite mix wall to a depth of 24 meters. The resulting permeability of the wall as demonstrated by laboratory and field tests is less than 1x10-6 cm/sec. During testing, seepage past the wall into the test cells was predominantly through the aquitard sediments beneath the test cell walls with the deeper wall more effective at cutting off the underflow.