基于垂直振动试验方法有机聚合物稳定碎石水稳定性研究

Abstract

通过与静压法成型试件和实体工程芯样的物理力学性能的对比，证明了垂直振动试验方法(VVTM)的适应性，并采用垂直振动试验方法研究了有机聚合物稳定碎石饱水强度和干化强度，分析了其水稳定性。结果表明：静压成型法存在着确定的ρdmax偏小、最佳含水率偏大、压实度处于100.2%~100.7%超百等现象，而垂直振动法确定的压实度一般处于98.3%~98.8％，最佳含水率更加接近实际，抗压强度与劈裂强度和现场芯样的强度吻合度在90%以上；随着浸水时间的延长，有机聚合物稳定碎石的相对含水率不断增大，抗压强度不断减小，当浸水时间达到32小时饱水时，抗压强度基本不再变化，且此时有机聚合物稳定碎石的抗压强度约为最大抗压强度的60%以上，浸水时间(t)与某一浸水时间下抗压强度与最大抗压强度比值(R)满足：R=-0.135Int+1.097；有机聚合物稳定碎石试件在重复饱水、干化后测定的干化强度，其残留强度比均大于90%，水稳定性良好。 The paper proved the adaptability of Vertical Vibration Test Method (VVTM) by comparing the mechanical strength with the core sample of practical engineering, taking the organic polymer (SRX) stabilized crushed stone base as the research object and exploring its water stability by studying its saturated strength and dry strength. The research shows that: the compaction degree determined with the static method was between 100.2% - 100.7%; there existed over 100% phenomenon; the compaction degree determined with VVTM was between 98.3% - 98.8%, and degree of anastomosis was more than 90% between the strength of the specimen and the strength of field core sample. The relative water content of SRX stabilized crushed stone constantly increased with the extension of immersion time; the compressive strength constantly decreased, when the immersion time was up to 32 hours after saturation, the compressive strength did not change, and the soaking time (t) and the ratio(R) of compressive strength and maximum compressive strength meet: R=-0.135Int+1.097 ; the residual strength ratio of SRX stabilized crushed stone specimen was more than 90% under the worst conditions; water stability was good.