水泥砾质土渗透特性试验研究

发布时间：2018-08-12 08:30

【摘要】：为研究水泥砾质土渗透特性,改进了常规三轴试验装置,并在该装置上进行了水泥砾质土三轴渗透试验,分析了水泥掺入比、掺砾量、压实度和渗透压对水泥砾质土渗透特性的影响。研究结果表明:水泥砾质土的抗渗性能随水泥掺入比的增加而得到较大幅度的提高;当掺砾量在30%~50%范围时,水泥砾质土的渗透系数在10~(-7) cm/s数量级,且满足土石坝心墙抗渗要求;相同掺砾量下,水泥砾质土渗透系数随着压实度的增加而降低,尤其是压实度≥98%时,其抗渗性能得到大幅度提高;在相同应力状态下,水泥砾质土渗透系数k_(20)与渗透压力比P(渗透压力p/大气压力pa)符合双曲线模型,且该双曲线可转换成P/k_(20)与渗透压力比P之间的线性关系。该研究成果为水泥砾质土应用于高土石坝心墙提供科学支撑。
[Abstract]:In order to study the permeability characteristics of cement gravel soil, the conventional triaxial test device was improved, and the triaxial permeability test of cement gravel soil was carried out on the device. The influence of compaction degree and osmotic pressure on the permeability of cement gravel soil. The results show that the impermeability of cement-gravel soil increases greatly with the increase of cement content, and the permeability coefficient of cement-gravel soil is in the order of 10 ~ (-7) cm/s and meets the impermeability requirement of the core wall of earth-rock dam when the content of gravel is in the range of 30 ~ (-7)%. The permeability coefficient of cement-gravel soil decreases with the increase of compaction degree, especially when the compaction degree is 鈮，

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