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依托实际工程,应用有限差分软件FLAC3D建立高速公路粉土路段地基模型,通过分别改变CFG桩和浆喷桩的桩长和桩间距,探讨二者在控制工后沉降以及沉降速率方面的不同。结果表明:在粉质土中经过CFG桩或浆喷桩处理后的路基沉降,比不进行任何处理的路基沉降小很多;CFG桩在对地基沉降的控制上优于浆喷桩,在相同的桩长和桩间距离下,CFG桩加固后地基的沉降明显小于浆喷桩加固后地基的沉降,并且沉降能够迅速趋于稳定;在桩长一定的条件下,随着桩间距离的增大,地基的最大沉降量也逐渐增大;在保持桩间距离一定的条件下,地基的最大沉降量随着桩长的减小而增大;保持桩长一定,随着桩间距离的增大,桩土应力比也逐渐增大;桩间距离保持不变,桩土应力比随着桩长的增大而逐渐增大。
Relying on the actual project, the finite element software FLAC3D was used to establish the foundation model of silt road section of expressway. The differences between the settlement and the settlement rate of the CFG pile and the grouting pile were discussed respectively by changing the pile length and pile spacing. The results show that the subgrade settlement in the silty soil treated with CFG pile or shotcrete pile is much smaller than that without any treatment. The CFG pile is better than the grouting pile in controlling the subsidence. Under the condition of the length of the pile and the distance between the piles, the settlement of the foundation after the CFG pile is strengthened is obviously smaller than that of the foundation after the grouting pile is strengthened, and the settlement can quickly stabilize. With the pile length increasing, , The maximum subsidence of the foundation is also gradually increased. Under the condition of keeping the distance between piles, the maximum subsidence of the foundation increases with the decrease of the pile length. When the pile length is constant, with the increase of the distance between the piles, , The pile-soil stress ratio also gradually increased; the distance between the piles remained unchanged, and the pile-soil stress ratio gradually increased as the pile length increased.