坝基覆盖层工程特性试验新方法研究与应用

程展林; 潘家军; 左永振; 胡胜刚; 程永辉

doi:10.11779/CJGE2016S2003

坝基覆盖层工程特性试验新方法研究与应用 English Version

长江科学院水利部岩土力学与工程重点实验室,湖北武汉 430010

基金项目: 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）

详细信息

作者简介:
程展林(1963- ),男,湖北武穴人,教授级高级工程师,主要从事土力学研究。E-mail: chengzl@mail.crsri.cn。

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出版历程
- 收稿日期: 2016-05-18
- 发布日期: 2016-10-19

New experimental methods for engineering properties of overburden of dam foundation and their applications

Yangze River Scientific Research Institute, Key Laboratory of Geotechnical Mechanics and Engineering of The Ministry of Water Resources, Wuhan 430010, China

摘要

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。
- 覆盖层 /
- 砂砾石 /
- 旁压试验 /
- 动力触探 /
- 模型试验
Abstract: For many high rockfill dams, which are constructed or will be constructed in Southwest China, deep overburden is one of the most complex engineering problems. The deformation and stress status play an important role in the safety of dams. For the traditional methods, because it’s almost impossible to collect gravel overburden layer samples, the original density cannot be determined exactly. Thus, it is very difficult to get the reliable mechanical and seepage properties of overburden layer in laboratory tests. A new method that indirectly calculates the original density of overburden gravel using pressuremeter tests (PMT) or dynamic penetration tests (DPT) is proposed. In the construction period of Wudongde, this method is successfully applied to the determination of the density of overburden layer. Furthermore, based on the indoor model tests, it is verified that the correction factor of rod length in DPT follows the description of Newton elastic collision theory. Therefore, a new pressuremeter probe with high pressure and side expansion is developed in order to conduct the whole-process pressuremeter tests on deep overburden. The proposed whole set method provides an important technical support for further studies on the engineering properties of deep overburden of dam foundation.
- overburden layer /
- gravel /
- pressuremeter test /
- dynamic penetration test /
- model test

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参考文献(12)

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