采矿与安全工程学报
採礦與安全工程學報
채광여안전공정학보
JOURNAL OF MINING AND SAFETY ENGINEERING
2015年
3期
414-419
,共6页
岩石断裂力学%应力强度因子%劈裂演化模型%翼型裂纹
巖石斷裂力學%應力彊度因子%劈裂縯化模型%翼型裂紋
암석단렬역학%응력강도인자%벽렬연화모형%익형렬문
rock fracture mechanics%stress intensity factor%splitting evolution model%wing crack
深部围岩常常产生较深的劈裂破坏区。针对这一现象，引入表征体积单元，考虑原生裂隙的闭合效应，采用双曲线模拟翼裂纹扩展路径，建立了基于曲线扩展路径的劈裂破坏模型。从微观角度出发，运用应力强度因子、最大周向拉应变理论推导了劈裂裂缝扩展演化方程，提出了劈裂破坏的预测新方法。采用FISH语言，将方程内嵌入FLAC软件中，使新方法程序化。新模型与Lajtai经验公式计算结果具有很好的一致性。与旧模型相比，新模型计算结果具有更高的精度，最大相对误差减小量为25.5%。
深部圍巖常常產生較深的劈裂破壞區。針對這一現象，引入錶徵體積單元，攷慮原生裂隙的閉閤效應，採用雙麯線模擬翼裂紋擴展路徑，建立瞭基于麯線擴展路徑的劈裂破壞模型。從微觀角度齣髮，運用應力彊度因子、最大週嚮拉應變理論推導瞭劈裂裂縫擴展縯化方程，提齣瞭劈裂破壞的預測新方法。採用FISH語言，將方程內嵌入FLAC軟件中，使新方法程序化。新模型與Lajtai經驗公式計算結果具有很好的一緻性。與舊模型相比，新模型計算結果具有更高的精度，最大相對誤差減小量為25.5%。
심부위암상상산생교심적벽렬파배구。침대저일현상，인입표정체적단원，고필원생렬극적폐합효응，채용쌍곡선모의익렬문확전로경，건립료기우곡선확전로경적벽렬파배모형。종미관각도출발，운용응력강도인자、최대주향랍응변이론추도료벽렬렬봉확전연화방정，제출료벽렬파배적예측신방법。채용FISH어언，장방정내감입FLAC연건중，사신방법정서화。신모형여Lajtai경험공식계산결과구유흔호적일치성。여구모형상비，신모형계산결과구유경고적정도，최대상대오차감소량위25.5%。
Splitting failure zones always appear in deep surrounding rocks. In response to this pheno-menon, the research has introduced REV and considered closure effect of pre-existing fracture. The hyperbolic curve has been applied to simulate the wing crack propagation path, and a splitting failure model has been established based on curve propagation path. From the microscopic point of view, stress intensity factor and maximum tensile strain theories have been applied to deduce the splitting crack propagation evolution equation. A new method to predict splitting failure has been obtained. FISH lan-guage has been applied to embed equation into FLAC, thus this new method has been programmed. The new model is well consistent with Lajtai empirical results. Compared with the old model, new model calculated results are more precise. The maximum decrease of relative error is 25.5% by using new model.
