冲击碾压法快速处置粉土路基的应用研究

发布时间：2018-05-31 20:03

本文选题：冲击碾压 + 粉土路基　；参考：《建筑科学与工程学报》2017年02期

【摘要】：针对黄河冲积平原区粉土路基填料受含水率影响较大、难以晾晒、普通碾压技术难以压实、生产效率低的特点,选择冲击碾压法对路基分层填筑施工。通过调整路基分层填筑厚度和压实遍数进行现场冲击碾压试验,检测路基表面沉降量、峰谷高差、压实度及路基承载力,并对比分析了3种不同虚铺厚度粉土路基的冲击压实效果。结果表明:表层土体压实度达到或超过93%后,压实度增长曲线出现拐点,继续碾压对提高土体压实效果影响越来越小,较难使层底土体压实度达到96%;路基填料允许的含水率ω范围为ω_(opt)-4%≤ω≤ω_(opt)+4%(ω_(opt)为最佳含水率);推荐的最佳虚铺厚度为0.8m,最适宜冲击碾压遍数为20,最佳碾压速度为10~12km·h~(-1);建议把沉降量和峰谷高差作为检测压实效果的辅助指标。
[Abstract]:In the alluvial plain area of the Yellow River, the silt subgrade filling is greatly influenced by the moisture content, it is difficult to dry the sun, the ordinary rolling technology is difficult to compact, and the production efficiency is low. The impact roller compaction method is selected to fill the subgrade layer filling construction. The ground impact rolling test is carried out by adjusting the thickness of subgrade filling and the number of compacted times, and the settlement of the subgrade surface is detected. The impact compaction effect of 3 kinds of silty soil subgrade with different thickness is compared and analyzed. The results show that the compaction degree curve appears turning point after the compaction degree of the surface soil is up to 93%, and it is more and more difficult to achieve the compaction degree of soil compaction by continuous rolling. 96%, the allowable moisture content of subgrade packing is omega (OPT) -4% less than Omega < omega (OPT) +4% (OPT) as the best water content. The recommended optimum virtual thickness is 0.8m, the optimum impact roller number is 20, the optimum rolling speed is 10~12km h~ (-1), and the settlement and peak valley height difference are suggested as auxiliary indicators for testing compaction effect.
【作者单位】：山东大学土建与水利学院;山东大学山东省路基安全工程技术研究中心;齐鲁发展集团济南—东营高速公路建设指挥办公室;
【基金】：国家自然科学基金项目(41372300)
【分类号】：U416.1

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