高等土力学作业承德中密砂汇编.docxVIP

PAGE \* MERGEFORMAT8 14.根据承德砂在三种围压下的三轴试验结果，计算Duncan双曲线，和，模型的参数。试验结果见下表。 表1 承德中密砂常规三轴试验数据表 围压100kPa围压300kPa围压500kPa应力差轴向应变体应变应力差轴向应变体应变应力差轴向应变体应变50.80.002250.0007490.90.001250.0007575.60.000250.00057100.20.004490.0013228.60.00350.00151245.40.00250.00114146.30.006740.00176353.30.005750.00236458.70.004760.00199184.90.008980.00223434.10.0080.00302634.90.007010.00275214.90.011230.00223520.30.010250.00329768.90.009260.00303233.10.013480.00214578.10.012510.00329875.10.011510.00341247.70.015720.00176620.20.014760.00329957.30.013760.00351258.70.017970.00158652.90.017010.003291022.40.016020.0036266.50.020210.00111678.90.019260.003021075.90.018270.00362730.022460.00056706.50.021510.002831119.70.020520.00341277.70.024710.00009723.30.023760.002361155.10.022770.00313281.20.026950.000037390.026010.001891183.70.025020.00294284.50.03032-0.00012751.50.029390.00161216.40.02840.00246287.80.03369-0.00195771.40.032760.000941243.90.031780.00199288.90.03706-0.00286784.60.036140.000281265.20.035160.00152289.40.04043-0.00381793.90.03952-0.000471280.80.038540.00104288.90.04492-0.00474801.60.04402-0.001231295.30.043040.00009287.90.04941-0.00567804.30.04852-0.002071306.90.04754-0.00066286.90.0539-0.0065805.80.05302-0.002921314.80.05205-0.00171285.30.05839-0.00752804.70.05753-0.0037713210.05655-0.00246283.60.06289-0.00827802.60.06203-0.004521323.90.06106-0.00322280.90.06738-0.00891799.20.06653-0.005371323.40.06556-0.00408---793.20.07216-0.006131321.10.0719-0.00423---785.90.07778-0.007071311.70.07682-0.005691．，模型参数求解 1.1 切线变形模量的5个参数求解 1.1.1 求解 根据常规三轴试验结果按的关系进行整理，二者近似成线性关系，则， （1） 式中，为直线的截距，为直线的斜率。 根据实验数据，可以拟合得到三条直线，如图1所示。 图1 不同围压条件下关系曲线 根据以上三条直线，可以分别得到三个，根据，求得；再根据，求得。计算结果见表2。 表2 参数计算表 围压100289.40.000018