CAJ | 학술논문

利用土工静力一动力液压三轴一扭转多功能剪切仪,针对相对密度D_r=30%的福建标准砂,进行了不排水条件下的单调剪切试验.在剪切过程中,控制平均固结应力和中主应力系数保持不变,而总主应力方向不固定.与剪切过程中总主应力方向固定不变条件下的单调剪切试验进行了对比分析.试验研究表明,当饱和砂土试样具有水平沉积面时,初始固结主应力方向与剪切方向的不同组合,导致单调剪切过程中总的主应力方向的不断变化,从而显著地影响着饱和砂土不排水单调剪切特性.总的主应力方向是影响饱和砂土不排水单调剪切特性的最根本原因.
이용토공정력일동력액압삼축일뉴전다공능전절의,침대상대밀도D_r=30%적복건표준사,진행료불배수조건하적단조전절시험.재전절과정중,공제평균고결응력화중주응력계수보지불변,이총주응력방향불고정.여전절과정중총주응력방향고정불변조건하적단조전절시험진행료대비분석.시험연구표명,당포화사토시양구유수평침적면시,초시고결주응력방향여전절방향적불동조합,도치단조전절과정중총적주응력방향적불단변화,종이현저지영향착포화사토불배수단조전절특성.총적주응력방향시영향포화사토불배수단조전절특성적최근본원인.
Using the soil static and dynamic universal triaxial and torsional shear apparatus,a series of undrained monotonic shear tests are performed for saturated Fujian standard sands with a relative density of 30%.The mean consolidation stress and the coefficients of the intermediate principal stress are invariable while the orientation of principal stress is variable in the proceeding of tests.By contrasting with the monotonic shear test results under the condition that the orientation of principal stress is invariable,it is concluded that when the saturated sand sample has horizontal sedimentary plane,the different combinations of initial orientation of major principal stress and direction of monotonic shearing make the actual orientation of major principal stress different during the shearing,which affecting the undrained monotonic shearing behavior of sand remarkably.The actual orientation of major principal stress is the most essential factor which affects the undrained monotonic shearing behavior of the saturated sand.