堆石料风化过程中的抗剪强度特性

Shear strength characteristic of weathering rockfill

利用新研制的堆石料风化试验仪,对泥质粉砂岩堆石料进行了荷载作用下干湿和温度耦合变化的风化试验。通过对风化后试样直接就机进行直剪试验,探讨了风化过程中堆石料的抗剪强度特性。研究结果表明,在较低应力状态下风化时,堆石料抗剪强度发生明显降低,颗粒劣化作用占主导;在较高应力状态下风化时,堆石料压密作用占主导作用,其抗剪强度反而会有所增加。在堆石坝工程中,堆石料风化一般仅会引起浅层滑坡问题。

A series of tests were performed in this study to examine shear strength characteristics of the rockfill samples of argillaceous siltstone under loading cycles of coupled wetting-cooling and dryingheating, using a new weathering test apparatus developed by our laboratory. The test results show that the shear strength is decreased under lower vertical load because particle degradation is dominant while it is increased under higher vertical load because rockfill compaction is dominant. In the rockfill dam engineering, the weathering of rockfill could generally cause shallow landslide.