- 期刊
水平導向鑽孔對地面沉陷之影響
Evaluation of Surface Subsidence Induced by Horizontal Directional Drilling
摘要
水平導向鑽孔技術在近幾年引進台灣，成為管線敷設穿越障礙時的最佳新技術。其最大的優點之一在於它對地面建物的影響非常小，明顯優於傳統之明開挖法。採用此種工法，不但管線路線可以簡單化，對地面建物和人類活動的影響也可以降到最低。目前，國內現有的輸油或輸氣管線，除了近幾年新敷設或更新管線業務的需求大幅增加，益發凸顯水平導向鑽孔技術的重要性。以經驗公式概算所得到的結果顯示，因HDD施工而可能引起之路面沉陷量小於1cm，符合高工局訂定的安全標準；而有限元素法方面，利用所蒐集到鄰近地區之地質鑽探資料進行初步數值分析計算的結果顯示，在施工之後短期內所造成之最大路面垂直下陷量為0.21cm；而長期降伏區變位所造成之最大路面垂直下陷量為0.57cm，二者均在容許之下陷範圍內，並不會對高速公路造成人車安全之影響。
並列摘要
The horizontal Directional Drilling (HDD) has been introduced into Taiwan in recent years, and has become one of the best techniques when placing pipeline crossing obstructions. The greatest advantage of HDD technique is its much less impact on the surface structure compared with traditional techniques such as excavation. It allows not only simplifying the planning but also minimizing the impact exerted to the surface construct ions as well as human activities. At the moment, the existing oil or gas pipelines are mostly aged except those implemented recently. In addition, the economic growth has led to increasing demand of pipeline implementation, which maks the HDD even more important. The results calculated from the estimate equation show that the road surface subsidence resulting from HDD is less than 1cm which is within the tolerance of the safety regulation. The results of the finite element analysis using material chaacteristics obtained from neighboring geologic investigation indicate that the short term maximum subsidence is 0.21cm. In long term, when creep comes into the play, the maximum subsidence is 0.57cm. Both cases sit well within the safety regulation and will not cause any considerable impact to the free way.