【摘要】：采用變換應(yīng)力方法將空間滑動面破壞準則應(yīng)用于修正雙屈服面模型,使該模型合理三維化。在不增加新參數(shù)的情況下可描述水泥礫質(zhì)土的力學(xué)特性,利用水泥礫質(zhì)土三軸試驗結(jié)果對三維化后的修正雙屈服面模型進行初步驗證。結(jié)果表明,在低水泥摻入比(wc≤5%)的條件下,三維化后的修正雙屈服面模型能夠較好地反映水泥礫質(zhì)土應(yīng)力~應(yīng)變關(guān)系的軟化現(xiàn)象,且充分體現(xiàn)了體變~應(yīng)變關(guān)系在低圍壓下的剪脹性和高圍壓下的剪縮性;但當水泥摻入比wc為8%且圍壓為200 k Pa時,水泥礫質(zhì)土的脆性顯著增強,其剪脹性也十分顯著,水泥礫質(zhì)土達到峰值強度后呈現(xiàn)脆性破壞,導(dǎo)致該模型計算值與試驗值誤差較大。該研究成果可為水泥礫質(zhì)土應(yīng)用于高土石壩心墻料力學(xué)特性研究提供一定的技術(shù)支撐。
[Abstract]:The failure criterion of spatial sliding surface is applied to the modified double yield surface model by using the transformation stress method, so that the model can be reasonably three-dimensional. The mechanical properties of cement gravel soil can be described without adding new parameters. The modified double yield surface model of cement gravel soil is preliminarily verified by using the triaxial test results of cement gravel soil. The results show that under the condition of low cement admixture ratio (wc 鈮，

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