本文選題：黏土水合物沉積物 + 應(yīng)力應(yīng)變曲線�。� 參考：《中國海洋大學(xué)學(xué)報(自然科學(xué)版)》2017年10期

【摘要】：以中國近海某天然氣水合物(水合物)區(qū)的海底粉質(zhì)黏土制備水合物沉積物樣品,并在土工三軸儀上進行實驗,分析其應(yīng)力應(yīng)變曲線和破壞應(yīng)力特性。結(jié)果表明:力學(xué)常數(shù)如破壞應(yīng)力(應(yīng)變?yōu)?5%對應(yīng)的偏應(yīng)力)隨水合物飽和度的增加而增加,在飽和度約25%時破壞應(yīng)力產(chǎn)生跳躍,即破壞應(yīng)力隨水合物飽和度的變化可分為兩部分,飽和度小于25%時水合物的存在對沉積物破壞應(yīng)力影響較小,大于25%時影響較大。在水合物飽和度小于45%的范圍內(nèi),水合物沉積物的應(yīng)力應(yīng)變曲線可分為彈性段、屈服段和強化段。文中給出了描述其應(yīng)力應(yīng)變曲線的分段函數(shù)。
[Abstract]:The marine silty clay in a natural gas hydrate (hydrate) area off the coast of China was used to prepare the hydrate sediment samples. The stress-strain curves and failure stress characteristics of the samples were analyzed by means of a geotechnical triaxial apparatus. The results show that the mechanical constants such as the failure stress (the strain is 15%) increase with the increase of hydrate saturation, and jump when the saturation is about 25%. That is, the change of failure stress with hydrate saturation can be divided into two parts. When the saturation is less than 25, the existence of hydrate has little effect on the failure stress of sediment, and more than 25. In the range of hydrate saturation less than 45%, the stress-strain curves of hydrate sediments can be divided into elastic section, yield section and strengthening section. A piecewise function describing the stress-strain curve is given.
【作者單位】： 中國科學(xué)院力學(xué)研究所;中國科學(xué)院大學(xué)工程科學(xué)學(xué)院;廣州海洋地質(zhì)調(diào)查局;
【基金】：中國地質(zhì)調(diào)查局項目(GZH2011003) 國家自然科學(xué)基金項目(11072245,41376078)資助~~
【分類號】：P741;TU41
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本文編號：1792787