凍融作用下水泥改良軟黏土的性能演化過程
發(fā)布時間：2018-11-26 12:29
【摘要】：以天津濱海新區(qū)的軟黏土為研究對象,制備了4種初始含水率的水泥改良軟黏土試樣,并對其進行了不同凍融循環(huán)次數(shù)下的無側限抗壓強度(UCS)試驗和孔隙分析.結果表明:隨著凍融循環(huán)次數(shù)的增大,試樣的無側限抗壓強度逐漸減小,強度衰減主要集中在前期1~3次凍融循環(huán)過程中;相同凍融循環(huán)次數(shù)作用下,試樣初始含水率越大,其強度損失率越大;試樣的孔隙分布特征受凍融循環(huán)次數(shù)和初始含水率影響,隨初始含水率增大,其孔隙分布逐漸由小孔隙分布區(qū)向較大孔隙分布區(qū)演變;低飽和度狀態(tài)下,凍融會引起土體局部孔隙收縮,但同時誘發(fā)裂隙產(chǎn)生;高飽和度狀態(tài)下,凍融會引起土體結構疏松.總體而言,凍融循環(huán)作用會引起水泥改良軟黏土細觀結構發(fā)生明顯損傷,最終導致其宏觀力學強度逐漸衰減.因此,在工程實踐中需要進一步關注水泥改良軟黏土的后期強度,并嚴格控制其初始填筑時的濕度狀態(tài).
[Abstract]:Taking the soft clay in Tianjin Binhai New area as the research object, four kinds of cement modified soft clay samples with initial moisture content were prepared, and their unconfined compressive strength (UCS) test and pore analysis were carried out under different freeze-thaw cycles. The results show that with the increase of freeze-thaw cycles, the unconfined compressive strength of the samples decreases gradually, and the strength attenuation is mainly concentrated in the early stage of 1 ~ 3 freeze-thaw cycles. Under the same freeze-thaw cycles, the higher the initial moisture content, the greater the strength loss rate. The pore distribution of the sample is affected by the number of freeze-thaw cycles and the initial water content. With the increase of the initial water content, the pore distribution evolves from the small pore distribution area to the larger pore distribution area. Under the condition of low saturation, freezing and thawing will cause shrinkage of local pores in soil, but at the same time, it will induce cracks, and at high saturation, freezing and thawing will lead to loose structure of soil. In general, the freezing and thawing cycle will cause obvious damage to the microstructure of the cement modified soft clay, and eventually lead to the gradual decline of the macroscopic mechanical strength of the soft clay. Therefore, in engineering practice, it is necessary to pay more attention to the later strength of cement modified soft clay, and strictly control the humidity state of its initial filling.
【作者單位】： 三峽大學三峽庫區(qū)地質災害教育部重點實驗室;宜昌朗天新型建材有限公司;
【基金】：湖北省自然科學基金資助項目(2014CFB664) 國家自然科學基金資助項目(51579137)
【分類號】：TU43
本文編號：2358562
[Abstract]:Taking the soft clay in Tianjin Binhai New area as the research object, four kinds of cement modified soft clay samples with initial moisture content were prepared, and their unconfined compressive strength (UCS) test and pore analysis were carried out under different freeze-thaw cycles. The results show that with the increase of freeze-thaw cycles, the unconfined compressive strength of the samples decreases gradually, and the strength attenuation is mainly concentrated in the early stage of 1 ~ 3 freeze-thaw cycles. Under the same freeze-thaw cycles, the higher the initial moisture content, the greater the strength loss rate. The pore distribution of the sample is affected by the number of freeze-thaw cycles and the initial water content. With the increase of the initial water content, the pore distribution evolves from the small pore distribution area to the larger pore distribution area. Under the condition of low saturation, freezing and thawing will cause shrinkage of local pores in soil, but at the same time, it will induce cracks, and at high saturation, freezing and thawing will lead to loose structure of soil. In general, the freezing and thawing cycle will cause obvious damage to the microstructure of the cement modified soft clay, and eventually lead to the gradual decline of the macroscopic mechanical strength of the soft clay. Therefore, in engineering practice, it is necessary to pay more attention to the later strength of cement modified soft clay, and strictly control the humidity state of its initial filling.
【作者單位】： 三峽大學三峽庫區(qū)地質災害教育部重點實驗室;宜昌朗天新型建材有限公司;
【基金】：湖北省自然科學基金資助項目(2014CFB664) 國家自然科學基金資助項目(51579137)
【分類號】：TU43
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