Pre-strain rib total deformation measuring method in pre-strain reinforcement test

Abstract

The invention discloses a pre-strain rib total deformation measuring method in a pre-strain reinforcement test. A calculation formula of the pre-strain rib total deformation epsilon i is Epsilon i=Delta Epsilon'i+Delta Epsilon ci+Delta Epsilon'ri, wherein the Delta Epsilon'i is initial pre-strain of a pre-strain rib, the Delta Epsilon ci is additional strain of the pre-strain rib due to soil body compression, and the Delta Epsilon'ri is rib creep rate. The actual engineering conditions are considered in the formula, the pre-strain rib total deformation can be accurately and reliably estimated, initial deformation degree of the rib during rib tensioning is ensured, overlarge additional rib deformation caused by settlement deformation of an embankment is avoided, accordingly fracture failure caused by the fact that the total rib deformation exceeds allowable strain is prevented effectively, and environmental geological disasters including high and steep slope slippage and the like can be scientifically prevented and decreased.

Description

technical field [0001] The invention relates to the fields of stress deformation and disasters of rock and soil bodies, elastic mechanics and plastic mechanics, in particular to a method for measuring the total deformation of prestrained reinforcements in prestrained reinforcement tests. Background technique [0002] The pre-strain reinforcement method is a new construction technology gradually developed in recent decades, that is, before the reinforced soil bears the external load, the geosynthetic material is stretched to cause a certain amount of deformation, and the geosynthetic material is used to Elastic retraction, the prestress is applied to the interface in the tension zone of the reinforced soil in advance, and this pressure is usually called prestress. Reinforced soil produces tensile stress under the action of external load, and it is necessary to offset this precompression stress, delay the generation of cracks in the overlying soil, limit the development of cra...

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Problems solved by technology

[0003] At present, the pre-stretching deformation treatment technology of non-metallic materials such as geosynthetics is relatively backward at home and abroad. At present, the total deformation of pre-strained reinforcement is estimated based on experience, so the reliability is not high, and the estimation accuracy cannot be guaranteed. Therefore, it is impossible to ensure that the initial deformation of the reinforcement is moderate when the reinforcement is stretched, which may cause the additional deformation of the reinforcement caused by the settlement deformation of the embankment to be too large, and the total deformation of the reinforcement exceeds its allowable strain to fracture and fail. Lead to the occurrence of environmental geological disasters such as high and steep slopes and large slippage

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