【摘要】：為建立原狀土的結(jié)構(gòu)性模型,對(duì)土的初始應(yīng)力及其在形成土材料過(guò)程中的作用進(jìn)行了研究,并在分析常規(guī)Mohr-Coulomb準(zhǔn)則適用性的基礎(chǔ)上對(duì)該準(zhǔn)則進(jìn)行了修正和改進(jìn)�；谕恋闹T多屬性均依賴于其特定的結(jié)構(gòu)性并最終依賴于對(duì)應(yīng)的初始應(yīng)力這一客觀現(xiàn)實(shí),給出了加(卸)載比的概念,并建立了能反映初始應(yīng)力和增量應(yīng)力的修正Mohr-Coulomb強(qiáng)度屈服準(zhǔn)則。在此基礎(chǔ)上,進(jìn)一步給出了Pisa原狀軟粘土和九州火山灰撒砂法試樣2種結(jié)構(gòu)性土真三軸試驗(yàn)的各向異性屈服模型。結(jié)果表明:基于初始應(yīng)力和增量應(yīng)力的修正Mohr-Coulomb屈服準(zhǔn)則以初始應(yīng)力線而不是等傾線為軸線,修正準(zhǔn)則能合理反映原狀土的結(jié)構(gòu)性和各向異性,且與試驗(yàn)結(jié)果吻合較好。
[Abstract]:In order to establish the structural model of undisturbed soil, the initial stress of the soil and its role in the formation of soil material were studied, and the applicability of the conventional Mohr-Coulomb criterion was analyzed. Based on the objective reality that many properties of soil depend on its specific structure and ultimately depend on the corresponding initial stress, the concept of loading ratio is given. The modified Mohr-Coulomb strength yield criterion which can reflect the initial stress and the incremental stress is established. On this basis, the anisotropic yield models of two kinds of structural soils, Pisa soft clay and Jiuzhou pozzolanic sand method, are presented. The results show that the modified Mohr-Coulomb yield criterion based on initial stress and incremental stress takes the initial stress line instead of the isoclinic line as the axis, and the modified criterion can reasonably reflect the structure and anisotropy of the undisturbed soil, and it is in good agreement with the experimental results.
【作者單位】： 河南大學(xué)土木建筑學(xué)院;新鄉(xiāng)學(xué)院土木工程與建筑學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51178290,41472253) 巖土力學(xué)與工程國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金項(xiàng)目(Z013002)
【分類號(hào)】：U412.22

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