英文篇名
APPLICATION OF ELECTRICAL RESISTIVITY IMAGINE PROFILE METHOD IN UNDERGROUND ENGINEERING
作者
李維峰、張嘉峰、梅興泰、蔡道賜
關鍵字
潛盾隧道、地質改良、非破壞性地球物理探測、地電阻影像剖面
摘要
大地工程中之地下鑽掘工程,如深開挖、捷運潛盾隧道等,皆是一般認定之高風險作業。地質改良效果確認於此類工程為極重要之步驟。一般地質改良均利用破壞性的鑽孔取樣或試水試驗來檢驗地改之成效。但採用鑽孔試水只能代表單點處或是小區域的狀況;並無法清楚明確的得知改良土體的完整性或分佈狀況的情形。針對此一工程問題本文提出一先進非破壞性地球物理探測方法—地電阻影像剖面探測,利用地質改良體或改良土體之高電阻率之特性、以及高含水量軟弱土壤之低電阻率特性;驗證地質改良效果並預測地下工程風險。除說明地電阻影像剖面探測原理與應用外,本文亦提出二個案例,證明此法已由傳統的之地質水文探測,進步到高精度之地下工程實務問題之解決。
英文摘要
In geotechnical underground engineering, such as deep excavation, shield tunneling construction, is generally considered as a high risk operation. It is very important stage to identify geology improving among these works. In traditional execution, they use destructive method, boring and water test, to verify the effect of geology improving. But they usually present the regional condition only, can not show the whole underground condition. Because of the improving soil or block have high resistivity characteristic and high water content soft soil have low resistivity. In this paper, we use developed non-destructive geophysical exploration, Electrical Resistivity Imagine Profile (RIP), to identify the quality of geology improving and predict the risk in underground engineering. We will introduce two cases and the results show that the RIP can clearly present the condition of underground anomaly. By doing this, we improve this method from 2D to 3D tomography. The outcome shows the traditional geological survey has been improved to a better accuracy in engineering problem solving.