CAJ | 학술논문

通过室内砂槽模型试验模拟均质无黏性土垂向流土的发生发展过程，研究无黏性土发生渗透变形和渗透破坏过程中，土体渗透系数、水力梯度、渗透流量等参数的变化规律，分析土体渗透变形过程中优势流的产生、发展的循环过程，并通过对比试验研究了发生流土破坏后的土体经过一段时间自重固结后的抗渗强度。试验结果表明：均质无黏性土在渗流作用下发生渗透变形的过程中，有一个渗透系数不变的阶段。这一阶段土体中还没有形成优势流，土体处于稳定的安全渗流阶段。土体中优势流的空间可变性造就了一个优势流“形成→发展→消失→再形成”的循环过程，这种循环过程伴随着土体中不断的微小渗透变形。土体发生流土破坏后，破坏区域的土体出现了水力筛分现象，水力筛分过程改变了土体结构，降低了土体的抗渗强度。
통과실내사조모형시험모의균질무점성토수향류토적발생발전과정，연구무점성토발생삼투변형화삼투파배과정중，토체삼투계수、수력제도、삼투류량등삼수적변화규률，분석토체삼투변형과정중우세류적산생、발전적순배과정，병통과대비시험연구료발생류토파배후적토체경과일단시간자중고결후적항삼강도。시험결과표명：균질무점성토재삼류작용하발생삼투변형적과정중，유일개삼투계수불변적계단。저일계단토체중환몰유형성우세류，토체처우은정적안전삼류계단。토체중우세류적공간가변성조취료일개우세류“형성→발전→소실→재형성”적순배과정，저충순배과정반수착토체중불단적미소삼투변형。토체발생류토파배후，파배구역적토체출현료수력사분현상，수력사분과정개변료토체결구，강저료토체적항삼강도。
The process of flowing soil in cohesionless soil was stimulated in laboratory tests to study the change rule among parameters such as permeability coefficient,hydraulic gradient and seepage discharge during seepage deformation. The cyclic process of preferential flow formation and development was analyzed in the process of seepage failure. Comparative tests were conducted to study the anti-permeability strength of soil after a period of consolidation. Results show that there is a period of steady fluid flow under low hydraulic gradient,during which the preferential flow has not formed and the permeability coefficient is a constant. The preferential flow induced by seepage is spatially variable in cohesionless soils. In the cycle of preferential flow formation,development, disappear and reformulation,the tiny seepage deformation happens all the time. In the broken area of flowing soils,the hydraulic screening changed the soil structures and reduced the anti-permeability strength.