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Freezing-thawing tests on natural pyroclastic samples

機(jī)譯：天然火山碎屑樣品的凍融試驗(yàn)

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摘要

Artificial Ground Freezing is one of the construction techniques that were extensively adopted during construction of Line 1 of Napoli Underground, to ensure stability and waterproofing of the platform tunnels and inclined passageways during excavation below the ground water table through loose granular soils of pyroclastic origin (Pozzolana) and a fractured soft rock (Neapolitan Yellow Tuff). The aim of the paper is to study the behavior of the Pozzolana and Neapolitan Yellow Tuff subject to freezing and thawing cycle at constant vertical stress under oedometric condition. As the temperature decreases the ice content increases and a liquid ice-surface tension, s-li, develops at the interface of the two phases as the temperature decreases. This tension must be balanced by the suction s defined as the difference in frozen and liquid water pressure Pi and Pl respectively. Two oedometers working under suction and temperature controlled conditions have been modified to work with temperature below zero degree. The stress path followed by samples reproduce the in situ vertical stress interested by freezing and thawing
機(jī)譯：人造地面凍結(jié)是那不勒斯地鐵1號(hào)線施工期間廣泛采用的一種施工技術(shù)，以確保在地下地下水位以下通過(guò)火成巖起源的疏松粒狀土壤進(jìn)行開(kāi)挖時(shí)確保平臺(tái)隧道和傾斜通道的穩(wěn)定性和防水性（Pozzolana ）和破裂的軟巖（那不勒斯黃凝灰?guī)r）。本文的目的是研究在測(cè)壓條件下，在恒定垂直應(yīng)力下，火山灰和那不勒斯黃凝灰?guī)r在凍融循環(huán)下的行為。隨著溫度降低，冰含量增加，并且隨著溫度降低，在兩相的界面處形成液態(tài)冰表面張力s-li。該張力必須由吸力s平衡，吸力s分別定義為冷凍水壓力Pi和液體水壓力Pl的差。對(duì)在吸氣和溫度受控條件下工作的兩個(gè)里程表進(jìn)行了修改，以使其溫度低于零度。樣品遵循的應(yīng)力路徑通過(guò)凍結(jié)和融化來(lái)復(fù)制原位垂直應(yīng)力

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