【摘要】：針對(duì)黃驊港區(qū)飽和密實(shí)粉土,通過(guò)三軸剪切試驗(yàn)以及原型耙齒切削試驗(yàn),研究飽和密實(shí)粉土剪脹特性及其對(duì)耙齒切削阻力的影響。三軸試驗(yàn)結(jié)果表明,黃驊地區(qū)飽和密實(shí)粉土在剪切過(guò)程中表現(xiàn)為應(yīng)變軟化性狀,偏應(yīng)力峰值與圍壓之間基本呈線性關(guān)系。在剪切過(guò)程中,土體先剪縮后剪脹,隨著圍壓的增大,剪縮性狀體現(xiàn)得越來(lái)越明顯,應(yīng)力應(yīng)變性狀可劃分為4個(gè)不同階段。原型耙齒切削試驗(yàn)結(jié)果表明,飽和土較非飽和土切削阻力增長(zhǎng)得更快;飽和土切削阻力最大值為非飽和土切削阻力最大值的2.7~3.3倍;對(duì)于飽和土,切削阻力達(dá)到穩(wěn)定值后,其波動(dòng)幅度較非飽和土要大。上述試驗(yàn)結(jié)果均表明,土的剪脹性對(duì)于耙齒切削阻力的影響十分顯著,須采取相應(yīng)的措施來(lái)降低土的剪脹性對(duì)于耙齒切削阻力的影響。
[Abstract]:In view of saturated dense silt in Huanghua Port area, the shear expansion characteristics of saturated dense silt and its influence on the cutting resistance of rake teeth were studied by triaxial shear test and prototype rake tooth cutting test. The results of triaxial test show that saturated dense silt in Huanghua area shows strain softening behavior during shearing, and there is a linear relationship between peak deflection stress and confining pressure. In the shear process, the soil is shelled first and then expanded. With the increase of confining pressure, the shear shrinkage behavior is more and more obvious, and the stress-strain behavior can be divided into four different stages. The experimental results of prototype rake tooth cutting show that the cutting resistance of saturated soil increases faster than that of unsaturated soil, and the maximum of cutting resistance of saturated soil is 2.73.3 times that of the maximum value of cutting resistance of unsaturated soil, and when the cutting resistance of saturated soil reaches a stable value, the cutting resistance of saturated soil increases more rapidly than that of unsaturated soil. Its fluctuation range is larger than that of unsaturated soil. The experimental results show that the shear dilatancy of soil has a significant effect on the cutting resistance of rake teeth, and corresponding measures should be taken to reduce the influence of soil shear dilatancy on the cutting resistance of rake teeth.
【作者單位】： 中交疏浚技術(shù)裝備國(guó)家工程研究中心有限公司中交疏浚技術(shù)重點(diǎn)實(shí)驗(yàn)室;同濟(jì)大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51479137)
【分類號(hào)】：U616

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