The Field Test Study Of Assemd Slabs Type Compostite Anti-sliding Structure

landslide disasters occur frequently in China.With the economic and social development,as the main anti-sliding structures,ordinary anti-sliding piles have the disadvantages of large section size,large volume of completion,low level of mechanized construction,and large potential safety risks in the construction process.These shortcomings need to be optimized and solved urgently.According to the current advanced hydraulic slotting construction technology and the need for landslide control projects,the new structure are proposed,which is named Assemd Slab type Composite Anti-sliding structure.This paper relying on China Railway's key project "Study of Assemd Slab type Composite Anti-sliding Structure",the anti-sliding characteristics of new structure in the form of I-shaped and n-shaped structures are analyzed deeply through field test methods and numerical calculations.Test loading is achieved by the two structures providing mutual reaction force.The dimensions of the two structures are: length × width × height = 1.5m × 1.5m × 6m.The front and back slabs of the n-shaped structure are 30 cm thick prefabricated slabs By cast-in-place to make them rigidly connected.An I-shaped structure is provided with vertical webs 20 cm thick,90 cm wide and 4 m long in the middle of the front and rear slabs of the n-shaped structure.Slope model achieved by excavating pits in the original soil.The research conclusion of this paper:(1)The anti-sliding performance of the I-shaped structure is better than that of the n-shaped structure.The presence of the web greatly increases the stiffness,strength and stability of the anti-sliding structure.The I-shaped structure is excellent in anti-sliding performance,reasonable distribution of internal forces,and can fully exert the material properties,and is an ideal structure to replace the traditional anti-sliding structure;(2)Before the destruction of the n-shaped structure,with the increase of the load,the pressure of the earth on the front and back of the n-shaped structure gradually increases,and the ratio between the two values also increases,and the maximum ratio is 2/5.The value of the lateral earth pressure of the I-shaped structure is very small,similar to cantilever piles;(3)The front and rear slabs of the n-shaped structure are deformed in the opposite direction,and the loaded sections are pressed and depressed.The deformation of the front and rear slabs of the I-shaped structure is basically the same,the whole structure is inclined toward the loading direction,and the structural stability is strong.With the increase of the load value,the ratio between the maximum deformation of the I-shaped structure and the n-shaped structure decreases from 3/4 to 1/4;(4)the rear slab is pulled at the river side above the sliding surface of the n-shaped structure,and it is pulled at the hill side under the sliding surface.The force in the front slab of the n-shaped structure is opposite.the rear slab is pulled at the river side above the sliding surface of the I-shaped structure,of which the front slab is pulled at the hill side under the sliding surface.The front slab of I-shaped structure is mainly pulled at the river side,and there is a abrupt change at the depth of 4m.As the loading value increases,the maximum ratio of the bending moment of the I-shaped structure and the rear slab of the n-shaped structure decreases from 1/4 to 1/7;(5)The maximum force of the web is 85%~117% of the unit height loading value.The web transfers most of the load to the front slab,so that the front and rear slabs of the I-shaped structure are similar in force;(6)The numerical calculation found that the reasonable depth of the web is 4m,which is 2/3 of the length of the structure.