【摘要】 利用自行设计的土样剪切波速超声测试装置,测得了干砂试样在几种工况下的剪切波速,并由剪切波速换算出了相应的干砂最大剪切模量Gmax。推导出计算干砂最大剪切模量的经验公式。分别给出了Gmax与孔隙比e、平均有效主应力 σ0及固结比kc的关系曲线,并与Hardin试验结果进行了比较,误差小于10%。作为比较,还利用共振柱仪测试了干砂在不同孔隙比下的Gmax,结果表明,本文的研究结果与Hardin曲线及共振柱试验结果吻合良好,而且比共振柱试验结果具有更好的相关性及可靠性。由于其操作简便快捷,超声测试方法具有良好的应用前景。更多还原

【Abstract】 The shear wave velocity of dry sand specimen under several load cases has been measured by a new developed ultrasonic measuring instrument, and the shear modulus is derived by the shear wave velocity. An experiential equation describing the shear modulus Gmaxof dry sand is obtained by the regressing of the test data. The shear modulus Gmax is established relations with e, 0 and kc, and is compared with those from Hardin Equation and from resonant column test data. Because of the reliable results and convenient operation, the ultrasonic measuring instrument has a bright prospects in application to geotechnical engineering.更多还原