基于Midas GTS/NX的新疆沙漠输水明渠风积土岸坡稳定性分析

为了准确评估各类工况对新疆沙漠输水明渠风积土岸坡稳定性的影响。通过开展室内土工试验及对该渠道岸坡地质工况进行了调查，采取Midas GTS/NX软件中的强度折减法对输水明渠在未加固和加固两种工况下的竣工期、降雨期、输水期和水位骤降4个时期的二维岸坡进行稳定性计算，通过对比岸坡在未加固与加固两个工况下4个时期的整体位移量、等效塑性应变区和安全系数，对岸坡整体稳定及加固效果给出了分析及评价。结果表明：渠道未加固与加固两个工况下4个时期下风积土岸坡均处于稳定状态，安全系数均大于1.30;渠道位于输水期时，坡体前缘水压增加，有效提高渠道岸坡的安全系数，但水位骤降对风积土岸坡稳定性影响最大，降雨次之；未加固时，4个时期的岸坡等效塑性应变区呈圆弧状且已贯通；经加固后，岸坡等效塑性应变区大体沿衬砌呈直线分布，滑移带位移变形得到较好控制，极大程度降低了滑坡灾害发生的可能性。研究结果在一定程度上可以为新疆沙漠风积土输水渠道工程建设提供参考。

Stability analysis of aeolian soil bank slope of Xinjiang desert water conveyance open channel based on MIDAS GTS/NX

In order to accurately evaluate the influence of various working conditions on the stability of aeolian soil bank slope in a desert open channel in Xinjiang. The indoor geotechnical test was carried out and the geological conditions of the channel bank slope were investigated. The strength reduction method in Midas GTS / NX software was used to calculate the stability of the two-dimensional bank slope in the four periods of completion period, heavy rainfall, water conveyance period and water level drop under the two conditions of unreinforced and reinforced. By comparing the overall displacement, equivalent plastic strain zone and safety factor of the bank slope in the four periods under the two conditions of unreinforced and reinforced, the overall stability and reinforcement effect of the bank slope are analyzed and evaluated. The results show that : Under the two working conditions of unreinforced and reinforced, the aeolian soil bank slope is in a stable state in four periods, and the safety factor is greater than 1.30 ; When the channel is located in the impoundment period, the water pressure at the leading edge of the slope increases, which effectively improves the safety factor of the channel bank slope, but the sudden drop of water level has the greatest influence on the stability of the aeolian soil bank slope, followed by rainfall. When not reinforced, the equivalent plastic strain diagram of the bank slope in the four periods is arc-shaped and has been connected ; after reinforcement, the equivalent plastic strain diagram of the bank slope is generally distributed in a straight line along the lining, and the displacement deformation of the slip zone is well controlled, which greatly reduces the possibility of landslide disaster. The research results can provide reference for the construction of Xinjiang desert aeolian soil water channel project to a certain extent.