裂隙岩体贯通及锚固止裂路径有限元分析

供水管网地震过程中往往会遭到不同程度的破坏,以震后管线破坏状态模拟为基础,对带渗漏管网进行水力分析,进而评价其服务性能.在渗漏管网流分析时,引入节点配水量和节点压力的函数关系,结合中国点式渗漏模型,通过求解非线性方程组,得到震后管网节点的供水量和节点压力.该方法在传统的管网水力计算基础上,考虑节点流量随水压的动态变化,避免了负的压力计算值的产生.以一实际管网为例,介绍了震后供水管网功能分析的应用方法.

Failure state simulation and functional analysis of water supply system in post-earthquake

The plastic zone near the crack tip of jointed rockmass is produced under the compression-shear stress condition. The nodes of jointed rockmass and anchor cables are overlapped one another. The pre-stress of anchor cable is loaded by equivalent strain and temperature method. The iso-parametric element with eight nodes is degenerated to singular element at crack tip to simulate crack. The mini-plastic zone distance near crack tip, extending orientation of crack, the effective distance between rock-bridges after failure of twain collinear cracks of different angles by mini-plastic zone distance judgment are obtained from strain point of view under different consolidated conditions. The mechanism on reinforcement of pre-stress anchor cable on crack prevention of different angles is analyzed. It is shown that the role of compression in crack rockmass is larger than the role of shear under consolidated condition. The effective distance between rock-bridges is increased under consolidated condition. The better consolidated condition is, the role of reinforcement on crack prevention to cracks of 30°~60° is more evident. The normal stress and lateral stress of jointed rockmass near crack are increased owing to additional stress of anchor cable, when the angles of crack are 0° and 90°. The better consolidated condition is, the larger the mini-plastic zone distance at crack tip is, and the reasonable consolidated angle is laid during the consolidated design.