本文選題：道路工程 + 加載速率效應(yīng)�。� 參考：《中國公路學(xué)報(bào)》2016年07期

【摘要】：為揭示荷載施加快慢對(duì)土體變形與強(qiáng)度特性的影響規(guī)律,基于三軸CU試驗(yàn),開展了不同圍壓和含水率狀態(tài)下,原狀和重塑黃土加載速率效應(yīng)的試驗(yàn)研究。在試驗(yàn)結(jié)果基礎(chǔ)上,分析了加載速率對(duì)黃土應(yīng)力-應(yīng)變曲線特征、抗剪強(qiáng)度以及結(jié)構(gòu)強(qiáng)度等的影響規(guī)律。研究結(jié)果表明:加載速率對(duì)黃土的應(yīng)力-應(yīng)變曲線形態(tài)有顯著影響,高加載速率、低圍壓、低含水率可以導(dǎo)致應(yīng)變軟化現(xiàn)象的產(chǎn)生;加載速率對(duì)剪切強(qiáng)度的影響存在臨界值,加載速率小于此值時(shí)抗剪強(qiáng)度隨著加載速率的增大而增大,超過此值時(shí)抗剪強(qiáng)度又有一定程度的降低,呈現(xiàn)先增后減的特征;加載速率對(duì)抗剪強(qiáng)度參數(shù)c和φ的影響規(guī)律不盡相同:黏聚力c隨著加載速率的增大呈現(xiàn)先增大后減小的規(guī)律,而內(nèi)摩擦角φ則隨著加載速率的增大單調(diào)遞減;加載速率對(duì)黃土結(jié)構(gòu)強(qiáng)度的影響規(guī)律與抗剪強(qiáng)度基本一致,亦存在一臨界加載速率,結(jié)構(gòu)強(qiáng)度隨著加載速率的增大也表現(xiàn)出先增大后減小的規(guī)律。
[Abstract]:In order to reveal the influence of loading speed and speed on the deformation and strength characteristics of soil, based on triaxial CU test, the loading rate effect of undisturbed and remolded loess was studied under different confining pressure and moisture content. Based on the experimental results, the effects of loading rate on the stress-strain curve, shear strength and structural strength of loess are analyzed. The results show that the loading rate has a significant effect on the stress-strain curve shape of loess, high loading rate, low confining pressure and low moisture content can lead to strain softening, and the influence of loading rate on shear strength has a critical value. When the loading rate is smaller than this value, the shear strength increases with the increase of the loading rate, and when the loading rate exceeds this value, the shear strength decreases to a certain extent, showing the characteristics of first increasing and then decreasing. The effect of loading rate on shear strength parameters c and 蠁 is different: the cohesive force c increases first and then decreases with the increase of loading rate, while the internal friction angle 蠁 decreases monotonously with the increase of loading rate. The effect of loading rate on the structural strength of loess is basically consistent with that of shear strength, and there is a critical loading rate, and the structural strength increases first and then decreases with the increase of loading rate.
【作者單位】： 長安大學(xué)國土資源部巖土工程開放研究實(shí)驗(yàn)室;長安大學(xué)地質(zhì)工程與測繪學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41372327)
【分類號(hào)】：U416.1

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