CAJ | 학술논문

颗粒级配是影响土体剪切强度的主要因素之一。通过配置三组不同级配尾砂试样，每组均在100kPa、200kPa、300kPa围压下分别进行不同初始孔隙比的固结不排水剪切试验，研究不同级配下尾砂的剪切特性及稳态强度特性，求出三种级配尾砂的稳态线及稳态内摩擦角。试验结果表明：在低围压时，各级配下饱和松散尾砂的应力-应变曲线呈软化型，且随着围压增高，软化越不明显。平均粒径越小的尾砂，其峰值强度与稳态强度越小，稳态线越靠近e-q坐标系的原点，即在同一荷载作用下，发生液化的可能性越大。为此，有必要加强细粒尾砂堆筑坝体液化势的评估，以防液化溃坝灾难的发生。
과립급배시영향토체전절강도적주요인소지일。통과배치삼조불동급배미사시양，매조균재100kPa、200kPa、300kPa위압하분별진행불동초시공극비적고결불배수전절시험，연구불동급배하미사적전절특성급은태강도특성，구출삼충급배미사적은태선급은태내마찰각。시험결과표명：재저위압시，각급배하포화송산미사적응력-응변곡선정연화형，차수착위압증고，연화월불명현。평균립경월소적미사，기봉치강도여은태강도월소，은태선월고근e-q좌표계적원점，즉재동일하재작용하，발생액화적가능성월대。위차，유필요가강세립미사퇴축패체액화세적평고，이방액화궤패재난적발생。
Grain size distribution is one of the main factors affecting the soil shear strength .By configuring three groups tailings sand samples with different gradations and initial void ratio , the consolidated undrained shear tests were conducted to study the shear properties and steady strength characteristics , and obtain three steady-state lines and steady-state internal friction angles .The test results showed that the stress-strain curves of saturated loose tail-ings sand are softening at low confining pressure , with higher confining pressure , the softening is less obvious . When the average particle size is smaller , the peak intensity and the steady state intensity are smaller .The steady state lines are closer to the origin of the e-q coordinate system , i.e., under the same load , the occurrence likeli-hood of the liquefaction is greater .For this reason , it is necessary to strengthen liquefaction potential evaluation for the fine tailings dam , in order to prevent the occurrence of liquefaction and dam disaster .