CAJ | 학술논문

季节性冻土地区的土材料在冻融循环作用后的强度参数对深基坑支护体系的安全性影响显著. 在季节性冻土地区深基坑支护稳定性设计和施工中, 考虑冻融循环作用后的土材料抗剪强度具有一定的实际意义. 采用直剪试验方法对冻融循环作用前后土材料强度参数进行研究, 绘制剪应力与剪切位移关系曲线, 抗剪强度与垂直压力关系曲线, 结合强度曲线计算得到内摩擦角及黏聚力. 分析表明: 冻融循环结束后, 土体的最大剪应力比冻融循环前降低; 土体的抗剪强度参数, 内摩擦角在冻融循环作用结束后减小, 黏聚力有所增加.
계절성동토지구적토재료재동융순배작용후적강도삼수대심기갱지호체계적안전성영향현저. 재계절성동토지구심기갱지호은정성설계화시공중, 고필동융순배작용후적토재료항전강도구유일정적실제의의. 채용직전시험방법대동융순배작용전후토재료강도삼수진행연구, 회제전응력여전절위이관계곡선, 항전강도여수직압력관계곡선, 결합강도곡선계산득도내마찰각급점취력. 분석표명: 동융순배결속후, 토체적최대전응력비동융순배전강저; 토체적항전강도삼수, 내마찰각재동융순배작용결속후감소, 점취력유소증가.
In seasonal frozen earth, the strong parameters of soil material are important for the stable security of the support system of deep excavation after freeze-thaw cycle. So it has the engineering significance to consider the strong parameters of soil material after freeze-thaw cycle. The direct shear test was performed to investigate the shear changes of earth which is under the effects of the freeze-thaw cycle, drawn shear-shear-shear displacement curves and shear strength-vertical stress curves, and the shear strength parameters, c and, can be worked out relating to the shear strength curve. The result of testing and researching show that the soil's maximum shear after freeze-thaw cycle is lower than that before the test. The soil's shear strength parameters, c has decreased after the test, however increases to some extent.