Mini time domain reflectometry probe for monitoring local soil moisture of cut-off walls in centrifuge model tests

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-05-23 DOI:10.1016/j.trgeo.2024.101278

Honghan Dong , Yun-Min Chen , Yu-Chao Li

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Abstract

Moisture content is a critical geotechnical property of soils affecting the compressibility, shear strength and permeability. Time domain reflectometry (TDR) has been widely used to monitor the soil moisture content in field and unit cell and column tests in laboratory, while the typical TDR probes can not be used in laboratory scaled-down model tests since their needle lengths are no less than 5 cm. This paper presents a novel-designed and fabricated three-needle mini TDR probe, whose needles are 22 mm in length and 2 mm in diameter with a 10 mm needle spacing. The suitability and performance of the mini TDR probe have been evaluated in laboratory. The effectiveness of the TDR probe was validated through monitoring the consolidation process of a 6-cm thick soil-bentonite (SB) slurry-trench cut-off wall in the centrifuge model test (acceleration = 20g). The results indicate that the mini TDR probe is capable of real-time monitoring of soil moisture content variation in the supergravity condition. The proposed mini TDR probe is fabricated easily and quickly and has a great potential for monitoring local soil moisture content in laboratory model tests.

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用于监测离心机模型试验中截水墙局部土壤湿度的微型时域反射探头

含水量是影响土壤压缩性、剪切强度和渗透性的关键岩土特性。时域反射仪（TDR）已被广泛应用于野外监测土壤含水量以及实验室中的单元格和柱体试验，但典型的 TDR 探头由于针长不小于 5 厘米，无法用于实验室缩比模型试验。本文介绍了一种新型设计和制造的三针微型 TDR 探头，其针长 22 毫米，直径 2 毫米，针间距 10 毫米。实验室对微型 TDR 探头的适用性和性能进行了评估。在离心机模型试验（加速度 = 20g）中，通过监测 6 厘米厚的土壤-膨润土（SB）泥浆-沟槽截壁的固结过程，验证了 TDR 探头的有效性。结果表明，微型 TDR 探头能够实时监测超重力条件下土壤含水量的变化。所提出的微型 TDR 探头制作简单、速度快，在实验室模型试验中监测局部土壤含水量方面具有很大的潜力。

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.