论文部分内容阅读
针对以往试验只考虑单一断面的缺陷,考虑道路材料非均匀性,研制了一种新的测定道路材料抗拉强度的试验装置。在该装置中采用环状试件,在环状试件的内壁施加径向压应力时,试样在环向方向产生拉应力。试验时,当内壁压力大到一定值后试样破坏。对试验数据进行分析,得到试样的抗拉强度,利用有限元计算确定了道路材料抗拉强度的计算公式。针对重塑土开展了试验装置的试验验证,结果表明推导的计算公式是有效可行的。同时也可得出重塑土的抗拉强度随干密度的增加而线性递增;随含水量的变化趋势是先增大后减小,并在最优含水量附近出现峰值。将相关试验方法与劈裂试验法、双轴贯入试验法和圆环液压试验法进行对比,结果表明:所提出的测试方法与其余方法的线性相关程度较高;当置信水平为0.05时,圆环拉裂试验法、双轴贯入试验法和圆环液压试验法3种方法测定结果的平均值之间没有明显的差异,所提出的测试方法可靠。
In view of the fact that only single section defects were considered in the past tests, a new test device for measuring the tensile strength of road materials was developed considering the inhomogeneity of road materials. In this device, a ring specimen is used. When a radial compressive stress is applied to the inner wall of the ring specimen, the specimen generates tensile stress in the circumferential direction. Test, when the wall pressure to a certain value after the sample damage. The test data were analyzed to obtain the tensile strength of the sample. The calculation formula of the tensile strength of the road material was determined by the finite element method. The experimental verification of the test device is carried out for the remolded soil. The results show that the derived formula is effective and feasible. At the same time, it can be concluded that the tensile strength of remolded soil increases linearly with the increase of dry density. With the change of water content, the tensile strength firstly increases and then decreases, and the peak value appears near the optimal water content. The correlation test method is compared with the split test method, the biaxial penetration test method and the circular hydraulic test method. The results show that the proposed test method is linearly related to the rest of the methods. When the confidence level is 0.05, There is no obvious difference between the average values of the three methods of ring pull test, biaxial penetration test and circular hydraulic test. The proposed test method is reliable.