坪林隧道沿線水力破裂法現地應力量測

In-Situ Stress Determination Using Hydraulic Fracturing Technique along Pinglin Tunnel Alignment

陳錦清(Jin-Ching Chern) ； 俞旗文(Chi-Wen Yu)

《地工技術》 46期 (1994/06) Pp. 35-46

https://doi.org/10.30140/SG.199406.0003

摘要

水力破裂法為現地應力量測最廣為採行之技術之一。其原理為測試使完整孔壁張裂與使張裂之孔壁閉合所需之壓力，將所測得結果經由理論之解釋，並透過裂縫拓印等步驟，決定現地應力之規模與方向。本文旨在描述台灣地區大地工程界首次利用水力破裂技術，在坪林－頭城地區進行應力量測工作所使用設備、測試步驟、測試成果及成果之詮釋。量測獲得坪林頭城地區之現地應力狀態為最大應力比（KH）與最小應力比（Kh）分別為1.1與0.6左右，而水平最大應力方向約為北30°東，與本區目前若干地體研究之結果大致相符。

關鍵字

水力破裂 ； 大地應力

並列摘要

Hydraulic fracturing technique is one of the most widely acceptedin-situ stress determination method in rock strata. The methodutilizes the measurement of pressure required to initiate andreopen fractures in a sealed section of a borehole and the impression taking of the fracturing plane to determine the magnitudesand orientation of the in-situ rock stresses.This paper describes the first application of the method in Taiwan in the in-situ stress measurement along Pinglin tunnelalignment. It discusses the equipments, testing procedure, testresults and their interpretations. The results show that the ratiosof maximum and minimum horizontal stresses to the overburden stressare about 1.1 and 0.6 in average, and the bearing of themaximum horizontal stress is about N30°E. These were found to bein agreement with the results estimated by using theoretical studyand tectonic evidences.

並列關鍵字

hydraulic fracturing ； in-situ stress