桩端后注浆钻孔桩承载性能与注浆关系的数值模拟

运用有限元分析软件模拟分析了某实际工程钻孔桩在注浆前后的承载性能,计算值和实测值吻合较好。引入注浆加固体半径和注浆体强度来模拟后注浆对钻孔桩承载力的影响,并指出注浆量的大小对承载力的影响较大,基本上随着加固体半径的增加线性增加,而注浆体强度的影响存在临界值,超过该值后,强度增加的影响甚微。

NUMERICAL SIMULATION OF THE RELATIONSHIP OF BEARING CAPACITY OF POST-GROUTING BORED PILE AND GROUTING PARAMETERS

The numerical simulations of bearing capacity of bored piles before and after grouting of a project by FEM are presented. The calculation results are better fit to the measurement results. The effects of past-grouting on bearing capacity are simulated introducing the radius and strength of grouted soil body. The results show the effect of grouting volume on the bearing capacity is large and the bearing capacity of bored piles is linearly increased with the increase of the radius of the grouted soil body. The effect of the strength of grouted soil on the bearing capacity is limited and the critical strength value of grouted soil exists, the effect of the increase of strength on the bearing capacity is very slight after the strength is over the critical value.