Experimental Research on New Composite Foundation of Transmission Lines

With regard to the transmission line foundation for the weather rock with a thin surface of clay covered, the conventional undisturbed -soil digging foundation or the rock - embedded foundation often fails to function well, and adoption of either of the two foundations can hardly meet requirements for safe and economical operation or environment protection. This paper presents a new and environment-friendly composite foundation combining the aforementioned two foundations. The prototype test of this foundation is carried out on a typical foundation site to test the construction safety and stability of the pit wall and the test results indicate that this composite foundation is able to make full use of the high bearing and low distortion in both conventional undisturbed -soil digging foundation and the rock -embedded foundation. Calculation formulas are induced for the uplift bearing capacity and overturning bearing capacity for the new composite foundation and to serve as useful technical data in applying the foundation to power transmission lines.