【正文】 pression method in process area Scheme Process Area (m2) Average depth of soft soil (m) Bearing Capacity of foundation soil (t/m2) Interval of vertical drains (m) Treatment Depth (m) Estimated Settlement (m) 1 28254 * _______________ 25286 5 10 2 41428* _______________ 37450 5 10 3 54313 * ________________ 49603 5 10 Note: 1) “ * ” : the numerator indicates the proposed process area, which is extended from the area specified in the tender documents (denominator). The edge of the specified area is extended by m. 2) The length of vertical drains = treatment depth + sand bed thickness ( ) + end margin () = . Geotechnical design of preloading method in general area Average depth of soft Interval of vertical Single films drainage 中國最大的管理資源中心 第 9 頁 共 10 頁 Scheme general Area (m2) soil (m) drains (m) Treatment Depth (m) Estimated settlement (m) 1 110934 2 98770 3 88617 Note: The length of vertical drains = treatment depth + sand bed thickness ( ) + end margin () = . 中國最大的管理資源中心 第 10 頁 共 10 頁 Geotechnical design of vacuum prepression method of general area Scheme Process Area (m2) Average depth of soft soil (m) Interval of vertical drains (m) Double films drainage Single films drainage Depth of vertical drains (m) Calculated Final consolidation settlement (m) Depth of vertical drains (m) Calculated Final consolidation settlement (m) 1 110934 / () 2 98770 3 88617 Note: The length of vertical drains = soft soil depth + sand bed thickness ( ) + end margin () = . 。 (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 achieve the requirement of the specification for soil improvement philosophy of vacuum prepression method The vacuum prepression method is used to consolidate foundation soil. This method consists in laying on the surface of foundation soil a sand bed, and in installing a