关于旋喷锚桩在基坑支护设计中几个问题的探讨

Discussion on several problems of rotary jet grouting anchor pile in foundation pit support design

近年来,旋喷锚桩在软土深基坑支护中的应用越来越多,并且效果良好。但是由于旋喷锚桩采用旋喷成桩工艺所形成的注浆加固体与传统预成孔后注浆形成的锚固体在成桩质量上差别很大,因此在实际设计计算过程中存在诸多参数问题。对旋喷锚桩加固体的弹性模量取值、杆体与加固体粘结力计算以及锚桩的布置间距问题进行了初步探讨,提出旋喷锚桩加固体的弹性模量及承载力计算方法,并总结了锚桩的合理布置间距,以避免群锚效应。

In recent years,rotary jet grouting anchor pile is used more and more in soft soil deep foundation pit support,and the effect is good. However,because the rotary jet grouting pile adopts the technology of rotary jetting pile forming,which is different from the traditional pre hole grouting,it has many problems in the process of actual design and calculation. The jet anchor pile and bearing solid elastic modulus value,force calculation and anchor pile spacing were discussed. The elastic modulus of jet anchor pile with solid and bearing capacity calculation method were put forward. The reasonable spacing of anchor pile to avoid the effects of anchor groups was summarized.