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某道路路基二灰土底基层填筑采用过量工业废料磷石膏,出现磷石膏石灰稳定土底基层遇水严重膨胀病害。围绕既有二灰土材料就地改良再生后的性能评价,采用力学性能快速普检与传统物理状态(密实度)抽检相结合的检测方案。其中,改良再生后二灰土路用力学性能检测,应用了DCP和PFWD快速普检方法,并与传统载荷板试验和弯沉试验等进行了对比分析。结果表明就地改良再生后的底基层回弹模量显著提高,指标的量值、均匀性和可靠性均满足相应层位的路用设计要求;同时验证了快速普检与抽检组合评价方案的合理性,以及底基层性能快速检测方法的有效性。
A subgrade of limestone subsoil of a subgrade filled with excessive industrial waste phosphogypsum, phosphogypsum lime stabilized soil base severe swell disease. Based on the evaluation of the performance of the existing lime-flyash material after the in-situ regeneration, the detection scheme combining the rapid general mechanical inspection and the traditional physical state (compactness) sampling was adopted. Among them, DCP and PFWD rapid general inspection methods were applied to test the mechanical properties of lime-fly ash road after improved regeneration, and compared with traditional load plate test and deflection test. The results show that the rebound modulus of subsoil improved remarkably after in-situ improved regeneration, and the quantity, uniformity and reliability of indexes all meet the design requirements of the corresponding layers. At the same time, the combination of rapid general inspection and sampling Rationality, and the effectiveness of rapid detection of sub-base performance.