三溪村红层水岩作用的时效性试验研究与应用

Experimental Research and Application on the Time Effect of the Red Beds Rock-water Interaction in Sanxicun

为进一步深入了解和掌握三溪村滑坡滑带泥岩饱水软化的特质,研究其随饱水时间的弱化规律以及将其恰当地应用于工程实践指导该区工程稳定性的防治与评价。将取自都江堰青城山后山的泥岩试样进行了不同饱水时间下的直剪试验以及将天然和饱和状态下的试样进行了应变式常规三轴压缩试验,并将实验结果进行了归纳用于后续的公式推导。结果表明:剪切面无论是人为选定还是自然选择,其结果都证实了水岩效应在红层泥岩饱水后对其强度起到了很强的负面作用;初期饱水时,水分较难渗入到岩体内部,多滞留在体表,随着饱水时间增长将会使泥岩失去部分岩石特性进而向土体属性过渡转化,表现在初期强度衰减较小,随后出现急剧下降。将两种试验的结果进行有效结合可以提高研究成果的工程实用性,方便实际工程中快速评价泥岩饱水后强度的衰减情况。

In order to further understand and master the qualities of mudstone under saturation in San Xicun slide、the weakening of law with immersion time and wishing that it will be applied to its proper engineering practice to control and evaluated the stability of project in this region, this article tests mudstone samples from Qingcheng Mountain in Dujiangyan in direct shear tests under different saturated time and strain triaxial compression test under saturation and unsaturation. Experimental results are summarized for the subsequent derivation. The consequences show that whether the shear plane was man-made or natural selected, results have confirmed the effect of water-rock plays a strong negative effect on the strength of saturated red mudstone. When the initial water saturating, it is more difficult to penetrate into the rock mass, and more stuck in the surface, With the increase of time, mudstone began to lose some rock properties and gradually transite to the soil which can be shown on the change of strength. TheSeffective combination ofStwo testSresultsScan improve theSpracticabilitySof research results and evaluate the decay of mudstone strength under water fastly in the concrete projects.