高填方路堤强夯试验与数值模拟研究

在现场进行单点夯击试验,然后,通过数值模拟进行研究。得出:4种夯击能量在5.5 m的深度处的下沉位移均达到5.0~7.0 cm;但是在深度超过6.0 m之后产生的沉降量几乎相等,各点的地表隆起量只在夯锤边缘2.0 m内有影响,超过这个距离,夯击对土体的隆起量的影响甚微。数值分析和现场试验所揭示的土体应力应变规律相同且数值相近;对于直径为2 m的夯锤,土体在1200 kN.m夯击能作用下的有效影响深度为4~6 m,锤间距(中心距)不宜大于3.5 m。上述试验和数值模拟成果可为同类条件下路基强夯加固施工提供参考。

Research of test and simulation on dynamic compaction in high roadbed

The relations between tamper times and settlement,the rule of settlement along the depth were obtained by local test,the numerical calculation was given.The settlement can be 5.0-7.0 cm when the depth is up to 5.5 m,but the settlement will be the same when the depth is up to the 6.0 m.the influence of the heave is 2.0 m along the tamper,or the influence is small.On the assumption that the upheaval around the tamper hole and the radial deformation is more small,The result is more closed that of the local test.The above solution can be used to provide consultant for the analogy engineering.At last,the reliability and validity of the tamper construction design was proved by a series of trail took action in local.