充气锚杆数值单元的建立与分析

Formation and analysis of the numerical simulation element for the inflatable anchor

为了研究充气锚杆的受力特征及相应参数对于锚杆锚固力的影响,利用数值方法建立了充气锚杆的计算模拟单元,分别改变锚杆充气长度和充气压力,得到相应锚固力的变化规律,结果表明:随着橡胶膜长度的增大,锚杆的极限锚固力不断增大,二者符合线性关系;由于橡胶膜充气压力的不同,导致了不同的极限锚固力,锚杆极限锚固力与充气压力之间的关系,以及锚杆达到极限锚固力所需的位移与充气压力之间的关系,均可用线性方程进行描述。

In order to study the mechanical characteristic of inflatable anchor,and the effect of the corresponding parameters to the limit anchoring force,the numerical simulation element for the inflatable anchor is built,the influences of the rubber length and air pressure of the rubber are changed,the bolt anchoring force and limit anchoring force are obtained.The results show that with the tensile procedure going on,the anchoring force increases gradually,whose relationship is in accordance with the linear form;due to the difference of the air pressure of the rubber,the differences of bolt head tensile displacement are encountered as well as the limit anchoring force of bolt.The relationship between the limit anchoring force with air pressure of the rubber,and the relationship between the required displacement for bolt to reach its limit anchoring force with the air pressure of the rubber can both be described by the linear equation.