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针对新疆三岔口-莎车高速公路某取土场的风积沙,采用重塑试样,进行围压为10、20和30kPa的动三轴试验,得出风积沙在循环荷载作用下的ε_p-N关系曲线。试验结果表明:动应力幅值不同时,ε_p-N关系曲线可分为3种类型:衰减型、临界型和破坏型。以累积塑性应变为破坏标准,得到风积沙的动强度,发现风积沙的动强度随着围压的增加而增大,随着动荷载循环次数的增加而减小。在试验分析的基础上提出动强度与荷载循环次数指数曲线模型,计算得到不同荷载循环次数和不同围压时风积沙的动强度。
Aiming at the aeolian sand in a borrow area of Sanchakou-Shache Expressway in Xinjiang, the remodeled samples were used to carry out dynamic triaxial tests with confining pressures of 10, 20 and 30kPa. The results show that under the cyclic loading, ε_p-N relationship curve. The experimental results show that the curves of ε_p-N can be divided into three types when the dynamic stress amplitude is different: decay, critical and failure. Taking the cumulative plastic strain as the criterion of failure, the dynamic strength of aeolian sand was obtained. It was found that the dynamic strength of aeolian sand increased with the increase of confining pressure and decreased with the increase of dynamic loading cycles. Based on the experimental analysis, an exponential curve model of dynamic strength and load cycle number is proposed, and the dynamic strength of aeolian sand at different load cycles and different confining pressures is calculated.