Study of Design and Calculation Method on Double-row Drilling Anti-slide Piles

Double-row anti-sliding piles have been used in the landslide,but its calculation theory is lack of consensus. Double-row drilling anti-sliding piles mainly bear landslide thrust,piles vertical deformation can be thought of as zero,based on the bridge multi-row foundation piles internal force and displacement calculation theory,the displacement method is ternary linear equation reduced to two linear equation group,stiffness coefficient was reduced from 9 to 4,in order to simplify the solution of pile body internal force and displacement. Based on the bridge theoretical calculation of pile,cushion cap and engineering example,the establishment of Double-row anti-sliding piles approximate formula for calculating the height of the coupling beam when the beam rigid,and recommended reduction multiplied by 0. 7 to0. 9 when calculating the coupling beam height. The application in the engineering practice found: in the landslide thrust is large,using Double-row drilling anti-sliding piles construction progress faster than single row of piles,good safety and lower cost; This method compared with the rigid frame model calculation method,found that the calculation results of rigid frame model tend to be conservative,the pile supporting conditions of different calculation results is difference larger,when used as embedded segment of rock hard and embedded deep,complete suggestion according to fixed bearing processing,when the built-in embedded rock complete but not deep or embedded deep but rock weathering broken serious,hinged support treatment is recommended.