A Study On The Thickness Of Retaining Rock At The Front Of Set-in-rock Anti-sliding Pile In Steep Slope

A specialty of landforms with great changes in terrain elevation, such as highand steep slopes which are slowly formed as a result of geological process, are foundin Western and Southwestern China. Due to the implementation of WesternDevelopment Strategy in China, varied infrastructures for the development ofnational economy have been developed vigorously, and a number of high-gradehighways and railways are built in both western and southwestern parts of China. Asthere are many mountains and hills, the construction of these highways and railwayshave to be carried out in steep-slope areas in consideration of roadway extension andenvironmental protection. Anti-sliding set-in-rock pile, as an anti-sliding retainingpart, is widely used in the engineering treatment of slopes covering landsides,highways and railways.Based on traditional theories for design of anti-sliding piles, this paper analyzesand studies the thickness of retaining rock at the front of set-in-rock anti-sliding pilefor steep slope.In this paper, we have obtained the following results through research:(1) Understand the working mechanism and deformation mode of set-in-rockanti-sliding pile in steep slope and rock and soil around the pile and discuss themethod of calculating the downslide force of the pile and its design by reference torelevant literatures;(2) Perform numerical simulation analysis by building a finite element modelwith ANSYS and analyze the stress and displacement of the set-in-rock anti-slidingpile and the rock and soil around the pile by simulating the non-linear contactbetween the pile and rock through contact elements;(3) Analyze the effects of changes in slope gradient on the thickness of retainingrock at the front of set-in-rock anti-sliding pile and work out the thickness ofretaining rock. With rise in slope gradient, the stress acting on the retaining workdeclines and the displacement of the pile head increases, resulting in an increase inthe thickness of retaining rock;(4) Analyze the effects of changes in length of anti-sliding pile in rock on thethickness of retaining rock at the front of the pile and work out the thickness ofretaining rock. With rise in the length of anti-sliding pile in rock, the stress acting onthe retaining rock declines and the displacement of pile head decreases, resulting in a decrease in the thickness of retaining rock.(5) Analyze the effects of rock strength on the thickness of retaining rock at thefront of set-in-rock anti-sliding pile and work out the thickness of retaining rock.With rise in the shear strength and elastic modulus of rock, the stress acting on theretaining rock increases and the displacement of the pile head decreases, resulting ina decrease in the he thickness of retaining rock.