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为了评估无粘性土路基强夯加固效果,结合现场试验成果,采用FLAC3D有限差分软件进行了数值模拟,重点针对夯击能2 000 kN·m时动应力衰减规律进行了对比分析。研究结果表明:强夯对无黏性土路基填料的加固效果明显,强夯竖向影响深度大于径向影响范围,径向动应力衰减速度较竖向要快;针对该类填料得出有效加固深度约6.0 m,径向加固宽度约6.04 m,以及强夯加固Menard公式修正系数α值。同时,还研究了强夯设计参数(锤重、落距、锤径等)对强夯加固效果的影响,并对相同夯击能下,几种不同锤重-落距组合形式的加固效果进行了探讨,得出夯锤重量及落距是影响加固无粘性土效果的主要因素,而夯锤面积、夯锤-落距组合形式仅影响表层约3 m内土体加固效果。
In order to evaluate the effect of dynamic compaction of non-cohesive soil subgrade, numerical simulation was carried out by using FLAC3D finite difference software combined with field test results. The dynamic stress attenuation regularity was analyzed when the impact energy was 2 000 kN · m. The results show that: Dynamic compaction has a significant effect on the reinforcement of non-cohesive soil subgrade filler. The vertical influence depth of dynamic compaction is larger than the radial influence range, and the radial dynamic stress attenuation speed is faster than the vertical one. A depth of about 6.0 m, a radial reinforcement width of about 6.04 m, and a modified value of Menard’s formula for dynamic consolidation. At the same time, the effect of dynamic compaction design parameters (hammer weight, fall distance, hammer diameter, etc.) on the reinforcement effect of dynamic compaction was also studied, and the reinforcement effect of several combinations with different hammer weight- The conclusion is drawn that the weight and fall distance of the rammer are the main factors affecting the effect of strengthening the non-cohesive soils, while the combination of the rammer weight and the rammer-hammer distance only affects the soil reinforcement effect within about 3m.