CFG桩与浆喷桩处治桥头跳车效果的对比分析

Comparative Analysis of Effects of Bridge Head Jumping Treated by CFG Piles and Slurry Jet Piles

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,by using the numerical calculation software FLAC3 Dto build the model of silt foundation of highway,and from changing the CFG piles and the slurry jet piles＇ length as well as distance between piles,the differences between the two in controlling settlement and rate of Sedimentation are discussed.Conclusions are drawn that：it is much smaller of settlement by handling with CFG piles or slurry jet piles than handling without any treatment;the CFG piles on the control of settlement is better than slurry jet piles,during the same pile length and pile distance,the foundation＇settlement treated by the CFG piles is significantly less than the settlement treated by the slurry jet piles,and settlement can be quickly stabilized;under the conditions of the same pile length,with increasing distance between piles,the maximum settlement of the foundation is gradually increasing;under the conditions of the same distance between piles,the maximum settlement of the foundation is gradually increasing with the pile＇length decreasing;holding the same pile＇length,with increasing distance between piles,the pile-soil stress ratio is also increasing;and holding the same distance between piles,the pile-soil stress ratio is gradually increasing with the pile＇length decreasing.