软土地区深基坑锚索电化学加固应用研究

发布时间：2018-10-22 20:12

【摘要】：在软土地区深基坑工程中,由于软土具有抗剪强度低、含水率高、孔隙比大和流变性等特点,传统注浆锚索的锚固力达一般很难达到设计要求。针对这样的工程实际问题,本文针对营口地区某深基坑工程的锚索进行了电化学加固现场试验研究和应用。电化学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深基坑工程锚索加固具有一定的意义。电化学加固法是一项涉及到多学科、多领域的加固方法。电化学加固包括电渗、电泳、物理-化学反应、热效应、土体结构变化等一系列物理化学反应过程。在电化学加固过程中,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。当将锚索作为阳极时,锚固力将得到大幅度的提高。本文对锚索电化学加固方法进行深入的研究。主要工作和研究内容如下：1、本文概述了软土地区深基坑工程的主要特点,针对锚索锚固力不足的问题,提出了锚索的电化学加固法,并进行了工程实践,取得了较好的成果；2、归纳了电化学加固法的发展历程,详细阐述了电化学加固的作用机理和微观过程,概括了电化学加固法的特点和适用范围；3、通过自行研制的试验设置,以辽宁省营口市某工程软黏土作为试验对象,进行室内锚索电化学加固、注浆加固、电化学注浆加固等试验：对比分析不同加固形式的锚索极限抗拔承载力,并给出了三种加固形式的极限抗拔承载力曲线和蠕变试验曲线；
[Abstract]:In the deep foundation pit engineering in soft soil area, due to its low shear strength, high moisture content, high porosity ratio and rheological property, the anchoring force of the traditional grouting anchor cable is generally difficult to meet the design requirements. Aiming at the practical problems of this kind of engineering, the field experiment and application of electrochemical reinforcement of anchor cable in a deep foundation pit project in Yingkou area are carried out in this paper. Compared with other traditional strengthening methods, electrochemical reinforcement method has the advantages of short time limit, convenient construction and low cost. Therefore, this reinforcement method has certain significance for the reinforcement of anchor cable in deep foundation pit in soft soil area. Electrochemical reinforcement is a multi-disciplinary and multi-field reinforcement method. Electrochemical reinforcement includes a series of physicochemical reactions, such as electroosmosis, electrophoresis, physico-chemical reaction, thermal effect, soil structure change and so on. In the process of electrochemical reinforcement, the soil around the anode is dense due to the effect of DC, and the colloid of iron hydroxide produced by anode corrosion has a cementation effect on the soil. When the anchor cable is used as anode, the anchoring force will be greatly increased. In this paper, the electrochemical reinforcement method of anchor cable is studied. The main work and research contents are as follows: 1. The main characteristics of deep foundation pit engineering in soft soil area are summarized in this paper. Aiming at the problem of insufficient anchoring force of anchor cable, the electrochemical reinforcement method of anchor cable is put forward, and the engineering practice is carried out, and good results are obtained. 2. The development course of electrochemical reinforcement method is summarized, the mechanism and microscopic process of electrochemical reinforcement are described in detail, and the characteristics and applicable scope of electrochemical reinforcement method are summarized. Taking the soft clay of a project in Yingkou City, Liaoning Province as the test object, the paper carries on the indoor anchor cable electrochemical reinforcement, the grouting reinforcement, the electrochemical grouting reinforcement and so on. The paper compares and analyzes the ultimate pull-out bearing capacity of the anchor cable with different reinforcement forms. The ultimate pullout bearing capacity curve and creep test curve of three kinds of reinforcement forms are given.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU472

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