赤泥堆积体邓肯-张模型参数试验研究

Experimental study on Duncan-Chang model parameters of red mud deposits

以焦作市中州铝厂的赤泥堆积体为研究对象,通过固结不排水三轴剪切试验(CU)研究了赤泥堆积体的抗剪强度和变形特性,并通过数值模拟对试验结果加以验证。结果表明:在不同围压下,该赤泥试样的应力-应变曲线表现为应变弱软化型或应变硬化型;模拟得到的应力-应变曲线与试验所得到的应力-应变曲线大致吻合。由此可知,试验所得邓肯-张模型参数具有一定的合理性,该模型能够较好地反映不同围压下赤泥堆积体的强度和变形特性。

Taking the red mud deposits produced by Zhongzhou Aluminum Plant in Jiaozuo City as the research object,the shear strength and deformation characteristics of the red mud deposits were studied through the consolidated undrained triaxial shear test(CU),and numerical simulations were performed to verify the test results.The results show that under different confining pressures,the stress-strain relationship curve of the red mud sample is strain softening or strain hardening the simulated stress-strain curve is roughly consistent with the stress-strain curve obtained from the experiment.It can be seen that the parameters of the Duncan-Chang model are reasonable and can better reflect the strength and deformation characteristics of red mud deposits under different confining pressures.