论文部分内容阅读
根据能量原理,推导了压力型锚杆的轴力与位移计算式。其中锚固体与周围土层的黏结力计算采用弹塑性剪切位移模型,并考虑因位移过大而发生土层卸荷的情况。提出了最小势能原理在压力型锚杆问题中的应用方法,并给出了能量方程的程序求解流程。最后通过算例分析了压力型锚杆在各级荷载下的轴力、位移以及剪应力分布情况,进一步讨论了压力型锚杆的荷载-位移曲线,计算了压力型锚杆极限锚固长度。得出的结论:①压力型锚杆在大部分荷载下都处于弹性工作阶段,一旦进入塑性状态,就表明即将达到承载力极限;②考虑土层卸荷情况的锚固体能量传递理论可以解释压力型锚杆极限锚固长度的存在。
According to the energy principle, the calculation formula of the axial force and displacement of the pressure type anchor rod is deduced. Among them, the anchoring body and the surrounding soil are calculated by using the elastic-plastic shear displacement model and considering the unloading of the soil due to the excessive displacement. The application of the principle of minimum potential energy in pressure-type anchor is put forward and the procedure of solving the energy equation is given. Finally, an example is given to analyze the axial force, displacement and shear stress distribution of the pressure-type anchor under various loads. The load-displacement curve of the pressure-type anchor is further discussed and the limit anchorage length of the pressure-type anchor is calculated. The conclusion is drawn as follows: (1) The pressure type anchor rod is in the elastic working stage under most of the loads. Once in the plastic state, it is about to reach the limit of bearing capacity. (2) The theory of anchor energy transfer considering the unloading of soil can explain the pressure The existence of anchor length limit anchor length.