Distributed settlement measurement device and measurement method

Abstract

The invention relates to a distributed settlement measurement device and a measurement method. The measurement device comprises continuous fiber composite bars that are in array distribution in a measured foundation and is vertically driven into soil or foundation. The continuous fiber composite bar is composed of a bottom anchoring end, a soil layer sensing rod body, a soil surface anchoring piece and a data line leading-out end. The soil layer sensing rod body internally contains multiple groups of long-gauge strain sensing units spliced in the length direction, the data line leading-out end is located at the upper end of the soil layer sensing rod body and is connected to the long-gauge strain sensing units, soil layer anchoring bolts consolidating each soil layer are arranged outside the splicing position of two long-gauge strain sensing units, the soil surface anchoring piece anchors the soil surface at a soil surface position, and scale is marked outside the soil layer sensing rod body. The device provided by the invention employs the structure to meet the settlement measurement requirements of hard soil layer and soft soil layer foundation in a complex environment, has strong resistance to external interference factors, is suitable for long-term continuous monitoring, has cheap price, and is convenient for construction and realization of multipoint distribution.

Description

technical field [0001] The invention relates to a technology for health detection and monitoring in civil traffic structures, in particular to a high-precision distributed settlement instrument and a measurement method thereof. Background technique [0002] For the foundation settlement measurement in civil transportation structures such as subways, light rails and viaducts, it is an important index for evaluating a foundation design or geotechnical structure design. Engineering practice shows that most foundation accidents are caused by excessive or uneven foundation deformation, so it is very important to correctly measure and control the differential settlement and total settlement of the foundation so that they do not exceed the allowable value. In recent years, people have made breakthroughs in many aspects of soil mechanics, but little progress has been made in the study of foundation deformation. The traditional land subsidence measurement methods include leveling, b...

AI Technical Summary

Problems solved by technology

However, due to the consolidation of the optical fiber and the filling material into a whole during the backfilling process, it is not suitable for distributed measurement of different deformations of each soil layer.

In addition, the optical fiber material is soft, and it is difficult to ensure the accuracy of vertical settlement measurement when tangential displacement occurs in the soil

In addition, for the reference points on the surface, especially soft soil foundations, there are problems such as low cohesive force, which makes it difficult to ensure the co-deformation of the sensor and the soil, and difficult to ensure a stable measurement reference point during soil erosion.

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