真空預(yù)壓發(fā)處理軟土地基施工方案英文版(已修改)
2025-05-28 14:47 本頁面
【正文】 Proposed Design Philosophy, Construction, Installation and Monitoring Method As per of Section of ITB 1 1 Proposed Design Philosophy, Construction, Installation and Monitoring Method ( as per of section ) 1. Source of borrows pit indicating the location and quantity We have license given by Vietnam authority to exploit a quantity of 8, 400,000 m3 in Nha Be river and the location is in Nhon Trach district, Dong Nai province. 2. Physical proprieties of proposed fill material The sampling test of sand proposed to use is carried out according to AASHTO M4589, C14488 (see Test Result of Analyses of Sand ponent). The specific weight of the sand is , unit weight , organic content % and modules . 3. Proposed method of statement and monitoring devices Method statement According to the geotechnical report of the site, the void ratio of the soft silty clay (e) is , and the permeability coefficient (Kv) *107cm/s. If we adopt “wick drains and preloading” method to reach a soil bearing capacity of 50Kpa, 75Kpa, 100Kpa under the site’s conditions, the consolidation period wo uld be far beyond the proposed work period. For the purpose of reducing the consolidation period of foundation soil an overload should be added, though the loading would be high to fulfill the bearing capacity of 100Kpa. Obviously, this technique would bear a tremendous number of loading and unloading, which would also mean a high construction cost. The stability of side slope would also be difficult to monitor. Based on our previous experience of soft soil improvement of China coastal and Hiep Phuoc Power Plant in Nha Be, 15km Southeast of Hochiminh City, the preloading method is appropriate only for general area. In process area we suggest to adopted the following method (details see drawings “ Proposed Process Area Plan” and “ Proposed Process Area Zone” in page 6, 7): f = 50 Kpa, vacuum prepression method。 f = 75 Kpa, vacuum prepression and filling water () on membrane method。 f = 100 Kpa, vacuum prepression pound with loading method. The hydraulic filling of sea sand should be adopted under the elevation +, which is specified in the tender documents. But based on our site investigation report, we propose to use sweet water sand instead of sea sand for these following reasons: Proposed Design Philosophy, Construction, Installation and Monitoring Method As per of Section of ITB 2 2 (1) Fine grade and high mud content of the sea sand。 (2) No local facilities available such as hydraulic filling mud absorption. The backfill material (sweet water sand) will be delivered by barges to the nearest dock and then carried by trucks to the site. Monitoring devices According to the requirement of the tender documents, settlement gauge should be installed at 50mx50m grid and be measured by leveling instruments. In accordance with the requirement of the owner, the static peration test should be carried out at the 10 specified points and the peration instruments should be buried through the whole depth of the pressible soil layers. The paction test of filling materials in site should be carried out with heavy pactor. 4. Design philosophy to a
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