【摘要】 锚固是岩土工程领域的重要加固技术手段,而喷射混凝土与锚固工程往往是共存的,合理的喷层厚度及锚固参数十分重要。按照弹性力学中的薄板弯曲理论,从喷层与锚杆的相互作用分析出发,认为钢筋网在喷射混凝土断面上呈S形分布是最合理的布置方式。结合工程实例,采用有限差分FLAC数值模拟方法,研究喷射混凝土技术在失稳加筋土挡土墙加固中的力学机制和应用效果,认为喷射混凝土可使锚杆间的墙体表面自由变形得到有效抑制、墙趾浅表面塑性区减少、锚杆预应力损失降低、加固效果得以改善;并对喷层厚度对加固效果的影响进行了详细分析,认为合理的混凝土厚度应考虑其具备柔中有刚、刚柔并举的力学属性,所得结论对锚喷加固工程中喷层厚度的确定具有指导意义。更多还原

【Abstract】 Anchoring is an important reinforcement in the geotechnical engineering.At the same time,the shotcreting is always indispensable for an anchoring engineering;so a reasonable thickness of the shotcrete and an anchoring parameter are very important for designing reinforcement engineering.Based on the theory of plate bending and considering the interaction of the shotcrete and anchor,it is concluded that the S-shape of the steel net is the most suitable.For example,based on the finite difference simulation of FLAC,the mechanism and effectiveness of the shotcrete in the reinforced earth retaining wall has been studied;the result shows that the shotcrete is effective in controlling the surface displacement of the wall,in deducing the plastic failure of the wall foot,in reducing the lose of the prestress of the anchors,and in improving the effectiveness of the reinforcement.At the same time,the study on the thickness of shotcrete indicates the reasonable shotcrete thickness should considering both the rigidity and pliability properties.This study will be an important reference in designing the thickness of shotcrete in the anchoring reinforcement.更多还原