填土和软土地层中抗浮锚杆的改进技术及评价

Improved Uplift Resistance Ground Anchor Installation Method in Fill and Saturated Soft Soil

抗浮锚杆因其地层适应性好、施工简便,极少出现施工难度,但是当高填方、高水位、软塑黏土层等不利地质情况复合出现时,易对抗浮锚杆造成不利影响。通过现场试验、工效分析、经济分析及可行性分析,与传统跟管钻进工艺相比,预先进行高压旋喷工艺提高了成孔质量,增强了岩土体和锚固体黏结强度,改善了土层的工程性质,能有效解决不良地质情况对锚杆施工带来的难题。在动态管理,信息法施工下,该工艺能更好的适用于软弱地层中抗浮锚杆施工。

Ground anchor,as one of the most important uplift resistance method,has always been the focus of the engineering project research due to its adaptability for a wide range of soils and simple construction installations.However,when adverse geological conditions such as high fill,high water level,soft plastic clay layer etc.are encountered,it is easy to induce adverse effects in the installation of the uplift resistance anchors.Through field in-situ tests,work efficiency analysis,economic analysis and feasibility analysis,compared with the traditional cased drilling method,the high-pressure jet grout method in advance can improve the borehole quality,enhance the bonding strength between rock and soil mass and anchor mass,and enhance the properties of soil layer,which can effectively resolve the problems induced from unfavorable geological conditions to anchor installation.Under the construction of the real-time management and information method,this method can be better applied to the construction of uplift resistance ground anchor in the soft soils.