Device and method for in-situ delamination observation of delta sedimentary body consolidation and subsidence

Abstract

The invention discloses a deltaic deposit consolidation settlement in-situ layered observation device which comprises a hollow probe rod. Observation piece pushing out holes are formed in one side ofthe probe rod at intervals, one set of settlement observation subsurface buoys are correspondingly mounted at each observation piece pushing out hole in the probe rod and comprise arc-shaped fixed pieces, settlement observation pieces and pushing pieces, the lower ends of the settlement observation subsurface buoys are fixed at the lower edges of the observation piece pushing out holes, the upperends of the settlement observation subsurface buoys are fixed onto the inner wall of the probe rod, the settlement observation pieces and the pushing pieces freely move on the fixed pieces through sliders, each settlement observation piece is provided with a stainless steel wire, the lower ends of the stainless steel wires are connected with the upper edges of the settlement observation pieces andsequentially penetrate lower edge holes and bottom holes of the pushing pieces, wire guide holes from top to bottom and the guide rings and wire collecting holes from bottom to top. When the observation device is used for observation, the upper ends of the stainless steel wires are closely pulled and connected with corresponding displacement sensors at the top of the probe rod. According to the device, disturbance to observation soil can be reduced, the consolidation settlement amount of deltaic deposit is accurately observed in a layered manner in a natural state in real time, and data are intermittently acquired for a long time.

Description

technical field [0001] The invention relates to an in-situ layered observation device and method for delta sedimentary body consolidation and subsidence, which can not only realize the in-situ layered observation of the subsidence characteristics of the delta sedimentary body in the land area, but also realize the in-situ layered observation of the subsidence characteristics of the underwater delta sedimentary body. It is especially suitable for the observation of the consolidation and settlement process of sediments in the large river delta area after rapid accumulation and the corresponding topographical changes. This device can accurately measure the consolidation and settlement of different sediment layers. and the contribution rate of sediment consolidation and settlement to topographic changes. Background technique [0002] Land subsidence generally occurs in many areas of the world, especially in coastal low-lying and delta areas, where the phenomenon of land subsiden...

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Problems solved by technology

[0005] CN201310338686, CN20310651342, CN201710198046, and CN201710787646 have announced soil subsidence layered observation devices or methods applied in different fields, but their common feature is that a measuring hole with a suitable diameter is drilled on the monitored soil, and a hollow tube is built into the measuring hole. After setting several layered markers between the hollow pipe and the measuring hole, the gap between the measuring hole and the hollow pipe is backfilled with materials of different materials, and the layered settlement of the soil is observed after filling. These soil settlement observation equipment or the method has several problems, for example: when drilling a measurement hole on a delta sediment body with loose sediment structure and poor plasticity, and inserting a hollow tube in the measurement hole, the surrounding sediments are prone to collapse and liquefaction, etc., resulting in The observation results are inconsistent with the actual situation, and even the hollow tube cannot be placed in the measurement hole completely due to the collapse of the measurement hole.

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