(1.北京科技大學(xué) 應(yīng)用科學(xué)學(xué)院，北京 100083；
2.中國科學(xué)院 地質(zhì)與地球物理研究所，北京 100029；
3.上海隧道施工技術(shù)研究所，上海 200233)
摘 要: 用類巖石材料白水泥多裂紋模型進行了雙向加壓實驗。實驗結(jié)果表明，在各種側(cè)壓σ2下，宏觀強度σc1基本上隨α增加而變大，但在α=45°左右呈現(xiàn)最低值；隨著側(cè)壓σ2增加，宏觀強度σc1明顯提高。用εθmax及σθmax斷裂判據(jù)對單個裂紋進行了分析，所給出的初始開裂角理論值與該多裂紋模型實驗值非常相符，對初始開裂載荷，能給出多裂紋模型實驗值的上限。以單向加壓實驗結(jié)果為基礎(chǔ)，建立了便于工程應(yīng)用且適用于多裂紋體的等效正交各向異性本構(gòu)關(guān)系。由此本構(gòu)關(guān)系所得的計算結(jié)果與雙向加壓實驗結(jié)果符合良好。
關(guān)鍵字: 雙向加壓；多裂紋體；正交各向異性；本構(gòu)關(guān)系
and orthotropic constitutive
relationship for regular cracks
in replicated rock mass
（1.School of Application Science,
University of Science and Technology Beijing，
Beijing 100083, China；
2.Institute of Geology and Geophysics，
Chinese Academy of Sciences，Beijing 100029, China;
3.Shanghai Institute of Tunnel，Shanghai 200233, China）
Abstract:A series of biaxial compression experiments，dealing with the effects of regular cracks in replicated rock mass，have been carried out. The results show that the macro-strength σc1 increases basically with the increasing inclined angle α of crack and remarkably with the increaseing side compression σ2.But when α≈45°，σc1 be comes the lowest. The initiation angle θ of the cracks and the up limit of the critical fracture load can be estimated well by the mixed-mode fracture criterions of εθmax and σθmax.Based on the results of uniaxial compression experiments，anorthotropic constitutive relationship is constructed，which can be applicable to the multi-cracked body problem of mining and other underground engineering.The computed re sults by this relationship agree well with the biaxial compression experime nt results.
Key words: biaxial compression; model experiment; multi- cracked body; orthotropy; constitutive relationship
