高压旋喷锚索在淤泥质地层基坑支护中的应用

Application of High-pressure Jet Grouting Anchor in Silt Layer Foundation Pit Supporting

淤泥质地层中采用预应力旋喷锚索桩锚支护结构能够有效限制支护结构的变形,大直径旋喷锚索能够有效降低锚固体与土体之间的应力水平,显著降低锚索的蠕变量,更好地控制基坑侧向位移。当地层下部有较好土层时,可适当增大锚索倾角,将锚固端伸入下部较好土层内,能有效提高锚索的可靠度。锚固端头部3~5m通过增加喷搅次数或提高喷浆压力,可在锚固端头部形成扩大头,能显著提高锚固力,减少锚索的塑性变形。

In the silt stratum,the pre-stressed anchor pile supporting structure can effectively restrain the deformation of the supporting structure,and the large diameter jet grouting cable can effectively reduce the stress level between the anchor body and the soil body,Creep,to better control lateral displacement of the foundation pit.When there is good soil layer in the lower part of the stratum,the anchor cable inclination angle can be increased appropriately and the anchoring end can be extended into the lower soil layer,which can improve the reliability of the cable.Anchor head 3~5mby increasing the number of spray or increase the spray pressure,can be formed extension head,can significantly improve the anchor force,reducing the plastic deformation of the anchor.