软岩耐崩解和室内浸水崩解试验方法差异性分析

Analysis in the Difference of Collapse Resistance Test and Immersion Test Schemes of Soft Rock

软岩的崩解性是我国西南地区岩土工程较为关注的岩石特性之一。通过室内浸水崩解和耐崩解试验条件和试验结果的差异分析,根据耐崩解指数将软岩的崩解强度分为强、中、弱3个等级,崩解机制则决定了试样崩解的强弱;但对于同一岩样,室内浸水崩解程度弱于耐崩解试验;而试验条件的不同则决定了试验产物颗粒分布的差异,且对于不同崩解程度的岩样影响是不同的。研究表明:强崩解和弱崩解岩样在两种试验方法中所得颗粒分布情况相差较大,且强崩解岩样室内浸水崩解试验所得颗粒分布不均匀;而弱崩解岩样耐崩解试验所得颗粒分布不均匀;而中崩解岩样崩解产物在两种试验方法所得颗粒分布相差不大。

Disintegration of soft rock is the feature paid extensive attention in China＇s southwest geotechnical engineering.Through the analysis in the differences of test conditions and test results of immersion test and collapse resistance test,according to the collapse resistance index,soft rock can be divided into three classes：strong collapse resistance,middle collapse resistance and weak collapse resistance.At the same time,some results can be found that collapse mechanisms determine the collapse strength of the specimens,but for the same sample,the collapse degree of interior immersion test is significantly weaker than collapse resistance test,and different test conditions determine the differences in experimental results of particle size distribution,and the effect to the sample of different degree of collapse is different.Research shows that：the particles distribution of strong collapse and weak collapse in two kinds of test schemes has a big difference.The particles distribution of stronger collapse sample in immersion test is uneven,and the particles distribution of weak collapse sample in collapse resistance test is uneven.However,the difference of particles distribution of medium collapse sample in both two kinds of test schemes is small.