航道骨架护岸结构的稳定性影响规律及其优化*

为探究不同结构形式航道骨架护岸结构的稳定性影响规律，选择出最佳护岸结构形式，并对该形式进行结构优化，结合沙河漯河—平顶山航运工程的实际情况，利用PLAXIS 3D分别建立了几种护坡的三维结构模型。结果表明：在人字形、菱形、拱形骨架3种形式中，使用拱形骨架时，岸坡的滑动破坏面范围最小，岸坡的安全系数最大；在设计拱形骨架护岸结构时，应首先考虑不同拱径对岸坡土体位移的影响，在对岸坡土体沉降控制较严格的工程上，可进一步考虑不同拱宽的设计取值对其不同影响；本工程建议拱形骨架护岸结构的设计参数由原设计方案（拱径2.5 m、拱宽0.05 m、埋深0.300 m）优化为正交方案（拱径4.5 m、拱宽0.05 m、埋深0.450 m），在减小岸坡土体位移的同时仅增加不到55 m3的混凝土用量。

Stability influence laws and optimization of channel skeleton shore protection structures

To investigate the stability influence law of different structural forms of channel skeleton bank protection structure，we select the best bank protection structure form，and carry out structural optimization of this form，combined with the actual situation of the Shahe Luohe to Pingdingshan shipping project，and establish several kinds of three-dimensional structural model of the bank protection slope by PLAXIS.The results show that among the three forms of herringbone，rhombus and arch skeleton，when using arch skeleton，the sliding damage surface range of the bank slope is the smallest，and the safety coefficient of the bank slope is the largest.When designing an arch skeleton bank protection structure，the influence of different arch diameters on the soil displacement of the bank slope should be considered firstly，and in the project with stricter control of the soil settlement on the bank slope，the different effects of different arch widths can be further considered.In the case of this project，it is recommended to optimize the structure of several kinds of berms by using PLAXIS 3D.This project suggests optimizing the design parameters of the arch skeleton bank protection structure from the original design scheme (arch diameter 2.5 m，arch width 0.05 m，burial depth 0.300 m) to the orthogonal scheme (arch diameter 4.5 m，arch width 0.05 m，burial depth 0.450 m)，while reducing the displacement of the bank slope soil，only increasing the amount of concrete by less than 55 m3