- 期刊
台朔麥寮重機械廠動力壓密地盤改良
Soil Densification by Dynamic Consolidation for Formosa Heavy Industries Corp., Formosa Plastic Group
摘要
台朔麥寮重機械廠基址地層屬於飽和疏鬆的粉質細砂，為防止地震時土壤液化，地表下9m之深度以上的土壤必須施以地盤改良，以確保安全。針對各種深層夯實改良工法，就其改良成效、施工時效及經費節省等各方面的詳細效益評估，台塑企業集團選擇了動力壓密工法，作為該海埔新生地之地盤改良方法。該工法採用了單擊能量600t-m的動力壓密改造型吊車，以四階段格柵式夯擊法，在約6.5公頃的基地上，施以280 t-m/m^2之單位總夯擊能量，造成了地表總沉陷量約為50cm～55cm，即土壤平均密度增加約6%。更由改良前後SPT、CPT及PMT之結果比較，證明了動力壓密工法，在台灣西海岸海埔新生地地層獲致非常成功的改良成效。
並列摘要
The Dynamic consolidation (Dc) was lately applied to the Mailiao plant site of the Formosa Heavy Industries Corp. in November 1993. This method was applied in Taiwan for the first times although it has been successfully applied in about 2000 practical projects with various kinds of soil for more than two decades all over the world. In order to improve the subsoils down to nine meters in the above-mentioned plant site, an operational energy of 600 t-m was applied to the ground in various number of blows and in four phases, which induced a total average energy of 280 t-m/m^2 to the total improved area of about 65,100 m^2. Consequently, this increased the average soil density of about 6% as shown by the settlement of the ground surface ranging from 50cm to 55cm. Furthermore, the results of SPT, CPT and PMT tests in this improvement project also showed that the DC method is a very successful method for the improvement of dredged fills at the western coastal area of Taiwan island for anti-liquefaction purpose.