Device for measuring stress and strain among sand particles and detection method

Abstract

The invention provides a device for measuring stress and strain among sand particles and a detection method. The device comprises a protective shell with a spherical appearance structure, wherein theprotective shell is provided with a plurality of draw hooks; a film-shaped central interlayer is arranged on the inner wall of the protective shell; an inner layer is adhered to the inner wall of thecentral interlayer; and a measurement sensing element, a signal acquisition and transmission system, a storage element, a power supply element and a data processing and analysis element are integratedin a cavity of the protective shell. The device and the method can be used for monitoring the stress and strain inside coral sand in real time, and the safety in island engineering construction is ensured.

Description

technical field [0001] The invention relates to the field of construction detection of deep coral sand island reef dredging and filling, in particular to a measuring device and a detecting method for stress and strain generated inside sand particles due to interaction after dredging and filling of important engineering reef sands. Background technique [0002] The Nansha Islands are far away from the mainland of China. There are only small-scale buildings on these islands and reefs. Due to the need to expand the islands and reefs in a short period of time, the consolidation time of the coral sand in the later stage is shortened, and the shape of the coral sand particles is irregular, increasing The void ratio of the coral sand is reduced. When it is subjected to a force, the corners are prone to fracture and breakage. Once the engineering construction is carried out on the upper part of the sand filling, the coral sand in the foundation is easily broken due to the increase in...

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Problems solved by technology

[0002] The Nansha Islands are far away from the mainland of China. There are only small-scale buildings on these islands and reefs. Due to the need to expand the islands and reefs in a short period of time, the consolidation time of the coral sand in the later stage is shortened, and the shape of the coral sand particles is irregular, increasing The void ratio of the coral sand is reduced. When it is subjected to a force, the corners are prone to fracture and breakage. Once the engineering construction is carried out on the upper part of the sand filling, the coral sand in the foundation is easily broken due to the increase in the gravity of the upper part, causing the foundation to collapse. Increased the instability of engineering safety. Therefore, it is necessary to monitor the stress and strain inside coral sand in real time during engineering construction to ensure the safety of engineering construction.

[0003] At the same time, the existing devices for monitoring stress and strain are all based on the surface layer of particles, which cannot penetrate deep into the particles to detect the stress and strain generated by the interaction of different particles. As a result, researchers only understand the changes in the mechanical properties of the external macroscopic, and it is difficult to analyze the internal fine particles. Explain the macroscopic changes caused by the macroscopic changes

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