本研究以數值分析軟體PFC2D，模擬一組規則節理岩盤承受建物荷載之裂縫發展，探討包括八種節理情況(無節理及七組不同節理傾角=0°、15°、30°、45°、60°、75°、90°)岩盤，兩種不同地表情況(水平地表、坡地及坡角=45°固定)情況。本研究在岩盤上方建置一剛性基礎，逐漸增加基礎載重使岩盤破壞，觀察上述組合情況之裂縫發展之初裂、裂縫延伸發展、建物下方整個破壞之裂縫發展趨勢，並分析討論觀查裂縫發展情況。
經模擬水平地表岩盤承載至岩盤破壞後發現，當節理傾角較小時，裂縫易朝橫向發展，裂縫分布區域接近扁平四邊形；當節理傾角變大，裂縫改朝偏向垂直向發展，裂縫分布區域呈倒三角形；No joint及七種不同傾角岩盤，裂縫分布最遠範圍右方、左方及深度約為4、3及1倍基礎寬。最後將模擬結果彙整，並提出定性及定量分析發現。

This study is using numerical analysis software PFC2D to simulate microcrack development of rock with one regular set of joint under foundation loading. Microcrack developmental tendencies are analyzed under the combination of eight joint conditions with different dip angle and two different surface conditions. Eight different joint conditions include seven different dip angle 0°、15°、30°、45°、60°、75°、90° and no joint. Two different surface conditions are horizontal surface and slope with slope angle 45°. In this study, the rigid foundation was built on the top surface of rock, and the loading of foundation increased gradually until the rock beneath foundation was failed. The whole process from microcrack initiation, development and linkage to fail under different dip angle were analyzed and comparison.
After simulated horizontal surface rock under loading to fail, it’s found that microcrack development is towards horizontal if dip angles is small, and the highly concentrated area is close to flat quadrilateral. When joints dip angle becomes larger, microcrack development is towards vertical and the highly concentrated area is close to inverted triangle. Eight different joint cases rock. The right, left and downwards farthest distances of highly microcrack concentrated area count from the midpoint of foundation bottom are about 4, 3 and 1 times width of foundation respectively. Finally, both qualitative and quantitative results are presented.

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