| With the rapid development of underground space,underground tunneling projects have gradually become the focus of transportation infrastructure construction,resulting in sludge becoming an uncertainty factor for the natural environment and human survival environment.In this paper,the traditional shield sludge treatment method is optimized,and the optimized sludge treatment system is used to resource and reuse the different particle sizes of sludge obtained after shield sludge and slurry screening treatment,and the shield sludge is used to prepare burn-free sludge brick by alkali excitation technology,and the ideal burn-free sludge brick is obtained after strength test and durability test,and the test parameters of this burn-free brick are used to make burnfree brick by Abaqus Numerical simulation of burn-free brick slope protection.The main research contents are as follows:(1)The optimization integrated shield sludge screening system and the integrated slurry vibratory dewatering screening system are used to screen the earth pressure shield sludge and the mud and water shield slurry to obtain 4 different particle sizes of sludge,part of which can be used as backfill material or shield synchronous grouting material,and part of which can be used for the preparation of burn-free sludge bricks or as vegetation improvement soil for resourceful reuse.The use of shield sludge not only alleviates the shortage of raw materials for construction,but also overcomes the high energy consumption and pollution problems associated with traditional sintered bricks.(2)Curing the shield sludge with alkali excitation technology to prepare alkaliexcited burn-free sludge bricks,setting various test ratios of burn-free sludge bricks with different kaolin dosing,different alkali equivalents and different cement dosing,conducting compressive strength tests and durability tests to find the ideal burn-free sludge bricks that meet the standard requirements.(3)The addition of an appropriate amount of cement can promote the hydration reaction of the burn-free brick system and enhance the strength of the burn-free brick;too large an amount of alkali equivalent will produce "flooding" and reduce the strength of the burn-free brick,through the test results to get the most ideal burn-free sludge brick in line with the standard requirements for the cementitious material mixture of25%,alkali equivalent 6%,cement mixture of 10% burn-free sludge brick.(4)Numerical simulation of Abaqus finite element of burn-free brick slope using the test parameters of optimal burn-free brick,comparative analysis of stress,plastic strain and displacement of slopes with different slope gradient and different rainfall intensity,and calculation of different slope stability safety coefficients using the strength discounting method.The calculation results show that the stresses,plastic strains and displacements of the slopes protected by burn-free bricks are smaller than those of the slopes not protected by burn-free bricks,indicating that the burn-free bricks play a certain protective role for the slopes;on the other hand,under the same rainfall intensity,the slope safety coefficient decreases with the increase of slope gradient,and at the same slope gradient,the slope safety coefficient decreases with the increase of rainfall intensity,indicating that the slope gradient and rainfall intensity jointly Finally,comparing with the calculation results of the concrete pavement block slope protection model,it is found that the protection degree of the slope by the burn-free sludge brick is greater than that by the concrete pavement block slope protection.According to the calculation results of the model,the maximum deformation of the slope occurs at the slope corner,so in the actual slope protection project,the monitoring points should be placed around the slope corner and the corner should be reinforced;the slope with high gradient can also be learned to reduce the slope gradient to achieve the effect of slope protection. |
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