本文選題：結(jié)構(gòu)性軟黏土 + 應(yīng)力狀態(tài)�。� 參考：《巖土力學(xué)》2015年04期

【摘要】：取樣與施工過程會對天然沉積結(jié)構(gòu)性軟黏土產(chǎn)生擾動,使土體的工程性質(zhì)發(fā)生演化,一些學(xué)者分別以擾動度和損傷變量兩個特征參數(shù)對該問題進行了較為深入的研究,但擾動度與描述土體應(yīng)力狀態(tài)的損傷變量之間的相關(guān)性目前仍未明晰。為此,以連云港天然沉積結(jié)構(gòu)性軟黏土進行不同應(yīng)力路徑下快速加載試驗?zāi)M土體應(yīng)力損傷,對損傷后土體進行固結(jié)試驗和無側(cè)限抗壓強度試驗,結(jié)合張孟喜提出的損傷變量以及兩種常用的擾動度(變形和強度)的定義,評價了損傷后土體的損傷變量和擾動度,探討二者間關(guān)系。結(jié)果表明,損傷后土體壓縮曲線屈服前的斜率并未產(chǎn)生明顯改變,即損傷變量與按變形定義的擾動度間關(guān)系不明顯;而損傷變量與以強度定義的擾動度之間存在線性遞增關(guān)系,說明了當土體沿著某一路徑加載時,越接近破壞線,其損傷程度越高,土體的強度也隨之降低。
[Abstract]:Sampling and construction will disturb the natural sedimentary structural soft clay and make the engineering properties of the soil evolve. Some scholars have studied the problem with two characteristic parameters of disturbance degree and damage variable respectively.However, the correlation between disturbance degree and damage variables describing the stress state of soil is still unclear.Therefore, the natural sedimentary soft clay in Lianyungang was used to simulate the stress damage of soil under different stress paths, and the consolidation test and unconfined compressive strength test were carried out on the damaged soil.Combined with the definition of damage variable and two kinds of disturbance degree (deformation and strength) put forward by Zhang Mengxi, the damage variable and disturbance degree of damaged soil are evaluated and the relationship between them is discussed.The results show that the slope before the yield of the soil compression curve does not change obviously, that is, the relationship between the damage variable and the disturbance degree defined by deformation is not obvious, but there is a linear increasing relationship between the damage variable and the disturbance degree defined by strength.It is shown that when the soil is loaded along a certain path, the closer it is to the failure line, the higher the damage degree is and the lower the strength of the soil is.
【作者單位】： 東南大學(xué)交通學(xué)院巖土工程研究所;
【基金】：國家自然科學(xué)基金(No.50908049,51378117)
【分類號】：TU43

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