某引水干渠渡槽基础不同岩性的地质参数

Geological Parameters of Different Lithology for the Foundation of a Diversion Channel Aqueduct

引水干渠工程一般轴线布设较长,往往横贯多个不同地貌单元,沿线水工建筑物的工程地质条件也不尽相同。干渠行进过程中,穿越宽而浅的沟谷时,为减少对原河谷水力条件的改变,采取渡槽过水方案。由于渡槽结构的特殊性,基础在岸坡和河谷段设置不同的承载方式。渡槽采取桩基对槽身进行荷载支撑,桩基的稳定性至关重要。根据河谷左右岸、河床揭露岩土不同岩性地质物理力学参数,也因此决定渡槽桩基端桩埋深各异。现场需针对性的室内外试验等手段确定地质参数、细粒土液化,并客观分析论证后,科学合理的提供地基承载力特征值,最大程度利用岩土物理特性提供科学依据。

The main diversion canal project generally has a long axis layout and often crosses multiple different geomorphic units.The engineering geological conditions of hydraulic structures along the line are also different.During the process of the main canal,when crossing wide and shallow valleys,in order to reduce changes in the hydraulic conditions of the original valley,a aqueduct drainage scheme is adopted.Due to the unique nature of the aqueduct structure,different bearing methods are set up for the foundation on the bank slope and river valley sections.The aqueduct adopts pile foundation for load support of the channel body,and the stability of the pile foundation is crucial.According to the geological,physical,and mechanical parameters of the exposed rock and soil on the left and right banks of the river valley and the riverbed,the burial depth of the pile foundation at the end of the aqueduct varies.On site targeted indoor and outdoor tests and other means are needed to determine geological parameters and fine-grained soil liquefaction,and after objective analysis and demonstration,scientific and reasonable characteristic values of foundation bearing capacity are provided to maximize the utilization of geotechnical physical properties to provide scientific basis.