曾文越域隧道最大厚度為1300公尺，現地應力預期將影響隧道穩定性，因此本研究以曾文越域引水工程東引水隧道東口附近沿岸露頭的長枝坑層砂岩做為材料，此材料與該隧道岩覆最高段之岩層屬同一岩層，但並未實際以工址處岩石做為材料。本研究以MTS反覆加載應力於試體之上使應力記憶於試體之中，再以音射法(AE)與變形率變化法(DRA)推估其室內預應力大小，探討將來運用此方法在岩覆最高處之長枝坑層砂岩現地應力推估的可行性。由於考慮未來運用本研究於現地應力量測時，岩心從現地取出至試驗進行需花費時間，因此需考慮延遲時間(Delay Time)對推估精度之影響。進而利用DSCA法與DRA法的觀念開發三向度(三維)預應力推估之方法，驗證以三維反覆均壓的方式，能否在有效防水之下，量測應變變化情形推估三維預應力的大小，省去以圓柱試體推估其它方向預應力需以不同方向鑽取岩心之不便。試驗中預應力的給定為σv、1.4σv、2.2σv三類，研究結果如下:
1.以超音波量測P波波速時，發現P波波速與單壓強度大小有關，P波波速較快單壓強度較高，反之，P波波速較慢單壓強度較低，其P波波速分界以4000m/s區別波速快慢。
2.本研究證明長枝坑層砂岩以AE法推估時有Kaiser Effect的現象，且以DRA法推估預應力亦為可行之方法，比較兩方法的推估準確性後發現DRA法較AE法來得準確。
3.延遲時間在14天之內以AE法與DRA法推估預應力時，誤差率隨著延遲時間的增長有遞減之趨勢，本研究研判延遲時間在14天之內對此兩種方法推估結果影響不大。
4.本研究證實以DRA法的觀念推估三維預應力，利用立方型試體進行試驗時，若能在有效的防水情況下，量測應變之變化則可有效推估其結果。

Tsengwen reservoir transbasion diversion tunnel has the largest thickness of overburden roughly 1300 m, which will be excavated in Changchikeng sandstone. The in-situ stress is expected to govern the stability of the tunnel. Thus, this study is focus on investigating the applicability in using Acoustic Emission (AE) and Deformation Rate Analysis (DRA) to estimate different pre-stress of Changchikeng sandstone. Since the tunnel construction has not reached the site with largest thickness, the investigated Changchikeng sandstones are obtained from the outcrops at the ground surface near the east entrance. Different pre-stress states 1、1.4、2.2 times of vertical stress and delay time are investigated because the rock samples from in-situ may be in different stresses and are unable to carry out uniaxial tests without sample preparation and transportation. In addition, combining differential strain curve analysis (DSCA) and DRA, we attempted to develop a new method to simultaneously measure three-dimensional (3D) pre-stresses. The test results show that,
1.P-wave velocity correlates with compressive strength. The higher P-wave velocity is, the stronger compressive strength is and vice versa. The P-wave velocity of 4000m/s is set to distinguish the sandstone.
2.The study proved that Changchikeng Sandstone has Kaiser Effect phenomenon and it is also feasible to estimate pre-stress by DRA. The pre-stress evaluated by DRA is more precise than AE.
3.The delay time insignificantly influences the pre-stress estimation in AE or DRA methods. The errors of testing results decreased when the delay time increased.
4.The study proved that the 3D DRA is workable if waterproof is well done.

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