Research On Slope Protection Structure Of Fabricated Lattice Beam

Lattice anchoring technology is widely used in highway,railway,water conservancy and other slope management projects.Its lightweight structure,fast construction,and practical are both convenient and beautiful.However,the practice of this structure is ahead of the theory,and the design has unreasonable phenomena,which leads to problems such as structural damage and protection failure of existing lattice beams.A new method for quickly repairing or replacing the existing protection structure is urgently needed.On the basis of summarizing a large number of predecessors’ patents and ideas,this paper proposes two fabricated lattice beam structures.And by comparing the previous test data to verify the rationality of using ABAQUS to simulate this structure,and by comparing this lattice beam and the traditional lattice beam form slope displacement,lattice beam force,lattice beam internal force distribution,the difference in failure stress and failure process of lattice beams has verified the feasibility of replacing the traditional structure with this structure.On this basis,the thickness of steel joints,the size of steel joints,the optimal cantilever length,and the environment-friendly structural form of the assembled lattice structure were optimized by numerical simulation methods,which provided rapid replacement and repair of the existing slope protection structure and guidance on new methods and numerical simulation.The following conclusions are drawn through research:(1)Two prefabricated lattice structures and their construction methods are proposed.One is a tenon-mortise lattice lattice beam,which is suiTab.for non-prestressed anchor structures.One is an assembled lattice with steel joints,which is also suiTab.for non-prestressed and prestressed anchoring structures.Both structures are lightweight,prefabricated in the factory,easy to construct,and meet strength requirements.(2)The numerical simulation method was used to simulate the interaction between the lattice beam and the soil slope,the local failure process of the lattice beam,and the internal force distribution of the lattice beam was extracted.The results were compared with the previous test results to verify the use of numerical simulation to analyze is reasonable.(3)The two prefabricated lattice structures proposed in this paper are analyzed by numerical simulation,and whether it is in controlling slope displacement,displacement of lattice beams,or internal force distribution and failure process of lattice beams,this article proposes prefabricated structures can meet the requirements.It is also found that the optimal steel node thickness of the assembled steel lattice connection grid is 5mm,and the optimal external elongation is 0.075 times the span length.(4)Considering environmental factors,the slope may have inflection points or uneven defects,so a small frame lattice beam form is finally proposed.According to the numerical simulation method above,the optimal cantilever length of the small frame lattice beam is obtained.It is 0.3 times the span length.And by comparing the traditional 1 * 3 cross lattice form,the numerical simulation method is used to output the internal force and structural displacement of the lattice beam.Although this form is worse than the traditional structural from displacement control,it is in the order of millimeters.And the internal force distribution advantage of the lattice beam is obviously.The implementation of this small frame structure is feasible.