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中文摘要：
选择宜昌小溪塔至鸦雀岭一级公路改建项目K25路段的膨胀土．通过室内直接剪切试验．进行r初始干密度对风化砂改良膨胀土抗剪强度指标的影响研究．试验研究表明：在含水率和掺砂比例一定时，改良膨胀土的粘聚力随着初始干密度的增大而增大，内摩擦角随着初始干密度的增大先增大后减小再增大；在含水率和初始干密度一定时。改良膨胀土的粘聚力随着掺砂比例的增大而减小，内摩擦角随着掺砂比例的增大先增大后减小．经风化砂改良后的膨胀土抗剪强度指标均可达到路用要求．
英文摘要：
Select the Yichang Xiaoxita to Yaqueling highway reconstruction project K25 sections of expan- sive soils, through laboratory direct shear tests, the initial dry density of weathered sand improved expan- sion of the soil shear strength parameters, test studies have shown that： certain moisture content and the proportion of doped sands improving expansive soil cohesion with the increase of the initial dry density in- creases, the angle of internal friction first increases and then decreases with the increase of the initial dry density small and then increases; a certain moisture content and initial dry density, modified expansive soil cohesion decreases with the increasing proportion of doped sand angle of internal friction with the sand-- doped proportion first increases reduced. Weathered sand improved the expansive soil shear strength param- eters can reach the road requirements.
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