國內隧道工程的建設逐漸朝向大尺度與大深度的方向發展，因此岩盤預應力的推估將日形重要，目前正在開挖中的曾文越域引水隧道預期隧道最大岩覆處可達1300公尺，高岩覆中較大規模的現地應力分佈情形左右著隧道開挖工程設計與施工安全，因此有必要發展一套簡便經濟的應力量測方法來了解其現地應力分佈情形。現地單一方向鑽孔的岩心直徑通常為五公分，若是能在單一方向岩心試體內部進行不同方向內鑽小試體的製作，並配合室內試驗法(音射法和變形率變化法)與三維應力場推導之結合將可建立現地三維應力場，然而材料在內鑽狀態下的應力記憶特性與以及材料的應力記憶值與所對應的方向是否正確將會影響三維應力推估結果，因此本研究以曾文越域引水隧道開挖至最大岩覆處所遭遇的岩體長枝坑層砂岩作為試驗材料，配合內鑽法進行該材料的應力記憶特性試驗，藉由試驗結果來作為未來室內試驗法應用在曾文越域隧道最大岩覆處之理論依據與試驗方法修正。而研究結果主要有以下幾點：
1.在試驗室條件給定試體預應力值來模擬現地應力時，高預應力加載下由於試體內部裂隙活動較不穩定，預應力反覆加載次數有可能會影響室內試驗法之推估結果，而要模擬現地三軸應力的狀態應以三軸預應力同時加載的條件較為理想。
2.長枝坑層砂岩試體在內鑽的情況仍不影響其Kaiser Effect現象下的應力記憶特性，且在三軸預應力同時加載下室內試驗法所推估出的應力值可以看出其方向性，說明了室內試驗法應用在現地三維應力推估的可行性。
3.未來以室內試驗進行曾文越域地區的現地應力量測時，有可能會遭遇到的問題有：岩體應力記憶值是否在其良好的應力記憶區間、轉折點判釋問題、應變片黏貼問題、解壓時間問題等，因此在岩心的挑選上或是試驗的過程中應針對這幾點予以加強改善。

As the increasing of size and depth of the tunnel constructions in Taiwan, measuring the pre-stress of the rock mass is an essential task for the tunnel design. For example, the maximum overburden thickness of the Tseng-wen reservoir tansbasin water tunnel is roughly 1300m, and the in situ stress condition will affect the design and safety. Therefore, it is necessary to develop an easy and economical technique to assess the in-situ stresses. The diameter of rock core samples taken from in situ borehole drilling is usually 5cm. In stead of conducting borehole drilling from different directions, in this study, we take under-cored samples at various directions from oriented rock core samples and integrate to the laboratory experiments (acoustic emission and deformation rate analysis) to analyze the in-situ three-dimensional stresses. To realize the stress memory characteristics of the under-cored rock samples and the accuracy of pre-stress estimations under different directions, we chose Changchikeng Sandstone as experiment specimen, and combined the artificial prestressed under-cored samples to the acoustic emission and deformation rate analysis to estimate the stress memory characteristic of the sandstone. The following test results of laboratory experiments will contribute to estimate the in situ stress on Tseng-wen reservoir tansbasin water tunnel region in the future.
1.High pre-stress loaded samples result in unstable crack activities. The number of loading cycles may affect the measuring results. It is appropriate that triaxial pre-stress loaded simultaneously for simulating in situ three dimensional stresses.
2.The triaxial pre-stress test resulted indicate that the under-cored Changchikeng Sandstone samples also perform Kaiser Effect, and the direction-dependency. In addition, the test results also proved that over-coring samples associating with acoustic emission and deformation rate analysis are feasible for estimating three dimensional stresses.
3.Future stress estimations conducted in the Tseng-wen reservoir tansbasin water tunnel region may encounter the following problems: the correctness of the pre-stress estimation depends on the value of the in-situ stress, determination of take-off point of the Kaiser Effect, stick strain gauge on the samples, and the delay time. Thus, when pick rock core samples or carry out experiments should modify these problem.

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