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通过强夯法加固煤矸石地基物理模型试验,用DH5939动态应变仪完整地记录了强夯每一击作用下煤矸石地基中的动应力,系统地研究了不同夯击能和夯击次数作用下不同深度煤矸石地基动应力的分布特征及其衰减规律。结果表明,在强夯冲击荷载作用下,动应力为单一的波峰,沿夯锤不同深度的动应力达到峰值具有明显的时滞性。强夯动应力在水平方向的衰减速度比竖直方向快,竖直方向的影响范围比平方向大。在相同的夯击能作用下,动应力峰值随深度衰减很快,近似呈负幂指数规律衰减。另外,对不同的测点,在夯击能一定的条件下,随着夯击次数的增加,有效加固范围内的动应力增加明显,但在3～6击后基本稳定。研究为精确模拟分析强夯加固机理提供了有效途径。
The physical model test of coal gangue foundation was strengthened by dynamic compaction method. Dynamic stress in coal gangue foundation was dynamically recorded by DH5939 dynamic strain gauge. The effects of different compaction energy and number of compaction were systematically studied. Dynamic characteristics of coal gangue foundation under different depths and its attenuation. The results show that under the action of dynamic compaction, the dynamic stress is a single wave crest, and the dynamic stress at different depths along the compaction hammer reaches the peak with obvious time lag. Dynamic compaction dynamic stress in the horizontal direction decay faster than the vertical direction, the vertical direction of the impact of the larger than the direction of the plane. Under the same tamper energy, the peak value of dynamic stress decays rapidly with the depth, which is approximately the law of negative exponential decay. In addition, for different measuring points, the dynamic stress in the effective reinforcement range increases obviously with the increase of the number of tamping under certain tamping conditions, but it is basically stable after 3-6 taps. The research provides an effective way to accurately simulate and analyze the mechanism of dynamic compaction.