【摘要】：為研究滲透壓下巖石翼形裂紋面部分閉合情況下的破壞行為,建立多裂紋間相互作用下壓剪翼形裂紋的力學(xué)模型,推導(dǎo)得到巖石翼形裂紋尖端應(yīng)力強(qiáng)度因子表達(dá)式.分析不同起裂角條件下,應(yīng)力強(qiáng)度因子隨巖石翼裂紋長(zhǎng)度的變化規(guī)律,并對(duì)參數(shù)進(jìn)行敏感性分析.基于摩爾-庫(kù)倫準(zhǔn)則,推導(dǎo)考慮裂紋間相互作用的部分閉合型裂紋的斷裂韌度表達(dá)式,得到巖石在壓剪應(yīng)力作用下Ⅰ,Ⅱ型裂紋的復(fù)合斷裂判據(jù).分析結(jié)果表明:裂紋間相互作用對(duì)應(yīng)力強(qiáng)度因子的影響效果顯著;應(yīng)力強(qiáng)度因子在起裂角為65°左右時(shí)達(dá)到最大;應(yīng)力強(qiáng)度因子對(duì)裂紋起裂角和翼形裂紋長(zhǎng)度較敏感,對(duì)裂紋閉合度的敏感性較小.
[Abstract]:In order to study the failure behavior under partial closure of rock wing crack surface under osmotic pressure, a mechanical model of compression shear wing crack under multi-crack interaction is established, and the expression of stress intensity factor at the tip of rock wing crack is derived. The variation rule of stress intensity factor with crack length of rock wing under different crack initiation angles is analyzed, and the sensitivity of parameters is analyzed. Based on the Moore-Coulomb criterion, the expression of fracture toughness of partially closed crack considering the interaction between cracks is derived, and the composite fracture criterion of crack 鈪，

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