软土地区电渗加固锚索在基坑工程中的研究与应用

Study and application of electroosmotic reinforced anchors in soft ground in excavation engineering

由于软土具有抗剪强度低、含水率高等特点,传统注浆锚索的锚固力一般很难达到设计要求,尤其是其渗透性差,使注浆浆液也很难在锚索周围扩散。针对这样的实际工程问题,本文针对锚索分别进行了电渗加固的室内试验研究和现场试验的应用。电渗加固法是一项涉及到多学科、多领域的加固方法,在加固过程中,由于直流电的作用使阳极周围土体密实,同时阳极腐蚀产生的氢氧化铁胶体对土体产生胶结作用,从而锚固力将得到大幅度的提高。电渗加固法相对于其他传统的加固法具有加固工期短、现场施工方便、成本低等优点,因此,这种加固方法对软土地区基坑工程锚索加固有很大意义。

Due to the low shear strength,high water content of soft soil,the anchorage force of traditional grouted anchor is generally difficult to achieve the design requirements,especially for the anchors in poor permeability soft soil with difficult in grout diffusion. The experiments on electroosmotic reinforced anchor are performed both in laboratory and field. Electroosmotic reinforcement method involves several disciplinary and field. During the reinforcement process,the soil surrounding the DC anode role will be compacted,and the soil will be cemented by the ferric hydroxide produced by colloid anodic corrosion,thus anchorage force will be greatly improved. Comparing with the traditional method,electroosmotic reinforcement method is advanced with short construction period,convenient implementation,low cost etc.,the method is significant to the pre-stressed anchors used in the excavation engineering in soft soil area.