Analytical method for h-type combined anti-sliding pile retaining landslide or excavated slope and its application to practical projects

The h-type combined anti-sliding pile is a retaining structure with a back pile and an corresponding anterior pile firmly connected by a horizontal beam at the top of the anterior pile. The structure is like "h" shape and can resist large landslide thrust. Its anti-sliding mechanism is discussed. According to its mechanical features, the structure can be analyzed by dividing it into two parts in light of the location of potential slip surface. Judging by laboratory test results and corresponding theoretical analysis, it is provided that internal forces of the part above the slip surface can be calculated by plane rigid frame model exerted by landslide thrust in the form of linear load and constrained by lateral elastic strata. In addition, slope pressure between the two piles in the h-type pile is involved in the model. So the other part under the slip surface can be further computed directly by elastic foundation beam theory. The given method is successfully used for designing the structure against a large excavated slope which consists of crushed stone mixed with clay in Guangyuan-Bazhong expressway projects in Sichuan, China. The practical results are reasonable.