CAJ | 학술논문

粘性土具有孔隙度大而透水性差的特点, 属于弱透水层. 目前粘性土的渗透系数主要通过室内土工试验获取, 但土工试验结果容易受到取样扰动的影响, 而且往往只能代表小尺度条件下的参数特征. 为了获得适用于现场大尺度条件下的渗透系数, 有必要进行现场抽水试验. 以南水北调中线总干渠某段粘性土为例, 采用多孔抽水试验计算粘性土的渗透系数, 并与室内试验结果进行对比分析, 探讨粘性土的渗透性, 对渠道开挖降排水具有重要的指导意义.
점성토구유공극도대이투수성차적특점, 속우약투수층. 목전점성토적삼투계수주요통과실내토공시험획취, 단토공시험결과용역수도취양우동적영향, 이차왕왕지능대표소척도조건하적삼수특정. 위료획득괄용우현장대척도조건하적삼투계수, 유필요진행현장추수시험. 이남수북조중선총간거모단점성토위례, 채용다공추수시험계산점성토적삼투계수, 병여실내시험결과진행대비분석, 탐토점성토적삼투성, 대거도개알강배수구유중요적지도의의.
Cohesive soil is aquitard with large porosity and poor permeability characteristics .Currently, permeability of cohesive soil is mainly acquired through laboratory soil test , but the test results are susceptible to sampling disturbance and only represent the parameters characteristic of small scale conditions .To obtain field permeability coefficient under large-scale conditions ,it is necessary to carry out on-site pumping tests .Taking cohesive soil for instance in a section of middle route of South-to-North Water Diversion Project , the study of the permeability of cohesive soil is carried out through the comparative analysis between multiple-observation-wells pumping test and laboratory .The study has the im-portant guiding significance for dewatering and drainage of channel excavation .