(1. 江西理工大學(xué) 資源與環(huán)境工程學(xué)院，贛州 341000；
2. 江西理工大學(xué) 建筑與測繪工程學(xué)院，贛州 341000)
摘 要: 通過塑性功增量分析離子型稀土礦體的剪脹特性，并在修正劍橋模型剪脹方程的基礎(chǔ)上，提出離子型稀土礦體的剪脹方程，從而構(gòu)建出適用于離子型稀土礦體的彈塑性本構(gòu)模型。結(jié)果表明：1) 所構(gòu)建新的剪脹方程能夠較好地描述離子型稀土礦體的剪脹比和其應(yīng)力比之間的關(guān)系；2) 確定了模型在一般應(yīng)力狀態(tài)下的彈塑性剛度矩陣，證明其對離子型稀土礦體的室內(nèi)三軸CD試驗(yàn)結(jié)果具有較好的擬合效果，并進(jìn)一步通過室內(nèi)等p三軸試驗(yàn)和減p三軸試驗(yàn)驗(yàn)證了模型的有效性。
關(guān)鍵字: 離子型稀土礦體；剪脹方程；彈塑性本構(gòu)模型；三軸試驗(yàn)
（1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. School of Architectural and Surveying& Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:The dilatancy behaviors of ion-absorbed rare earth ore body were analyzed by the increment of plastic deformation work. On the basis of the dilatancy equation of the modified Cambridge model, the dilatancy equation suitabled for ion-absorbed rare earth ore body was proposed, then a new elastoplastic constitutive model was proposed. The results show the main conclusions are as follows: 1) The new dilatancy equation can well describe the relationship between dilatancy ratio and stress ratio of ion-absorbed rare earth ore body; 2) The elastoplastic stiffness matrix of the model under the general stress state is deduced, the model has made considerable fitting results for the triaxial CD test results, and the triaxial constant p test and the triaxial decreased p test verify its effectiveness.
Key words: ion-absorbed rare earth ore body; dilatancy equation; elastoplastic constitutive model; triaxial test
