Study on axis selection of the second-line ship lock extension project of navigation power junction in inland river

Based on the second-line ship lock extension project of Zhuzhou Navigation Power Junction in Xiangjiang River,the fixed bed physical model was established.According to the ship lock navigation condition,the spacing distance selection of axis between the second-line ship lock extension project and the first-line ship lock was studied.The effect laws of different positions of axis in the second-line ship lock extension project on the navigation flow condition of approach entrance area and connecting section were analyzed emphatically.On the premise of meeting the requirements of channel width and ensuring construction safety,the selection principle of axis was proposed,the key of which was to decrease the distance between the old and new ship lock axes as much as possible.