坝基覆盖层工程特性试验新方法研究与应用

发布时间：2019-02-20 18:35

【摘要】：中国西南地区正在或即将建设的高土石坝工程中,很多都涉及深厚覆盖层。在深厚覆盖层上建高土石坝,覆盖层坝基变形受力状态对坝体安全起重要作用。针对深厚砂砾石覆盖层取样困难而无法准确合理确定其天然密度,进而影响室内力学和渗透试验的开展,提出了利用旁压或动探试验间接推求天然砂砾石覆盖层密度的新方法,成功应用于乌东德深厚覆盖层工程特性研究,获得了覆盖层天然密度,较好的解决了深厚覆盖层工程特性测试难题。同时,针对新方法中存在的两个技术难题,基于室内模型试验验证了动力触探杆长修正系数的演化规律符合牛顿弹性碰撞理论,研制了一种的新型旁压仪的探头,实现了深厚覆盖层中旁压试验全过程测量。上述研究成果为进一步提升深厚覆盖层上高土石坝坝基变形预测与设计水平提供了重要技术支撑。
[Abstract]:Many of the high earth-rock dams under construction in southwest China involve deep overburden. High earth rockfill dam is built on deep overburden. The deformation and stress state of overburden dam foundation plays an important role in dam body safety. In view of the difficulty of sampling deep sandy gravel overburden and the difficulty of accurately and reasonably determining its natural density, and thus affecting the development of indoor mechanical and permeable tests, a new method of indirectly calculating the density of natural sand and gravel overburden by means of pressure-by-side or dynamic exploration test is put forward. It has been successfully applied to the study of the engineering characteristics of the deep overburden in Wudong Germany. The natural density of the overburden has been obtained and the difficult problem of testing the engineering characteristics of the deep overburden has been solved. At the same time, in view of the two technical problems existing in the new method, based on the indoor model test, the evolution law of the length correction coefficient of the dynamic sounding rod is verified to conform to Newton's elastic collision theory, and a new type of probe for the pressure-presser is developed. The whole process measurement of pressure-pressure test in deep overburden is realized. The above research results provide important technical support for further improving the deformation prediction and design level of high earth rockfill dam foundation on deep overburden.
【作者单位】：长江科学院水利部岩土力学与工程重点实验室;
【基金】：国家自然科学基金项目(51379021) 长江科学院创新团队项目(2015051/YT) 中央级科研院所基本科研业务费项目(CKSF2015046/YT)
【分类号】：TV223;TV641

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