大粒径泥砾筑堤试验研究

Research on Embankment of Large Particle Clay Gravel

探讨大粒径泥砾筑堤施工的可行性。以南水北调中线磁县段二标渠道为例,结合相关规范规程与"达西定律"中有关渗流的理论,利用筛析法选取≤15 cm粒径泥砾料作为试验材料,选择45 cm和40 cm的铺料厚度进行碾压试验直至达到最大干密度值;选取泥砾中粒径<2 cm的土样做击实试验,做出粒径<2 cm土样在最大干密度下的最优含水率,再根据所选土样的颗粒级配推算出泥砾全样的最优含水率;选择渗透筒法测定渗透系数,采用DZS3型水准仪测量每层填料松铺后、振动碾压后的沉降量。结果表明:本标段泥砾料的最大干密度值在2.12 g/cm3,最优含水率在9%左右,试验结果满足均质坝相关施工技术指标,将泥砾料作为壤土替代料进行大规模的渠堤填筑工作是切实可行的,可为今后类似工程的施工提供借鉴经验。

Discussion on the feasibility of clay gravel embankment construction. Taking the Cixian＇s Ⅱ bid section of the Nan - shui - bei - diao middle line as an example. According to the related codes and the seepage theory of Darcy model. Selected by sieving mud Gravel≤15 cm diameter as the test material, 45 cm and 40 cm in thickness of RCC shop were selected for test material until the maximum dry density rolling experiment. Size of less than 2 cm of clay soil was chosen doing gravel compaction test. Less than 2 cm in diameter soil maximum dry density to be made under the optimum moisture content. Then, according to the selected the particle grading of soil clay gravel calculate the optimum water content of all samples. Permeation tube method. Permeation tube method was chosento determine the permeability coefficient. Loose soil and vibration roiling shop of each layer＇ settlemerit to be measured by DZS3 Type of water level measurements. The results showed that the mudgravel maximum dry density values is 2.12 g/cm3 and the optimum moisture content is around 9%,test results meet the related codes. Gravel instead of loam for large - scale reclamation work of canal bank is feasible, which can provide experience for the future construction of similar projects.