泥质岩崩解性状的模型试验研究  

Model Experimental Research on Disintegration Behaviors of Argillaceous Rock

作　　者：朱士东 曹雪山[2] 刘扬 ZHU Shidong;CAO Xueshan;LIU Yang(JSTI Group Co.,Ltd.,Nanjing 210019,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]苏交科集团股份有限公司,南京210019 [2]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098

出　　处：《现代交通技术》2022年第4期1-6,共6页Modern Transportation Technology

摘　　要：通过循环浇水风干的过程模拟干湿循环作用,测试岩面剥蚀深度、裂隙宽度等,开展室内大模型的崩解试验研究。试验结果表明:泥质砂岩面崩解现象不明显,而泥岩显著;泥岩的收缩量明显大于泥质砂岩。岩面裂隙观测结果表明:浇水后泥质砂岩裂隙度与风干时间呈线性相关;泥岩裂隙度与风干时间呈非线性相关,包括初期快速增大阶段和后期缓慢增大阶段;风干时间长短与裂隙度受干湿循环影响的程度关联较大,短时间内,岩面裂隙度随干湿循环次数增加保持相同的波动状态,但干燥时间超过临界值后,裂隙度会突破原有波动状态,加剧干湿循环对裂隙的影响。试验成果还表明,施工过程的短期坡面冲刷不是影响边坡稳定的主要问题。By simulating the dry-wet cycle with cyclic watering and air-drying,the depth of denudation of rock face and the width of crack were measured,and the disintegration test of large model was carried out in laboratory.The experimental results show that the surface disintegration of argillaceous sandstone is not obvious,while that of mudstone is obvious.The shrinkage of mudstone is obviously greater than that of argillaceous sandstone.The rock surface fracture observation shows that the fracture degree of argillaceous sandstone after watering is linearly correlated with air drying time.The fracture degree and the drying time of mudstone are nonlinear,the initial stage is rapid increase stage and the later stage is slow increase stage.The length of drying time has a great influence on the crack degree by the wetting and drying cycle.In a short period of time,the crack degree keeps the same fluctuation state with the increase of the number of drying and wetting cycles,but when the drying time exceeds the critical value,the crack degree breaks through the original fluctuation state,thus increasing the effect of drying and wetting cycles on the crack.The results also show that the short-term slope scour is not the main problem of slope stability during construction.

关 键 词：泥质岩 崩解模型试验 崩解演化规律 裂隙度 

分 类 号：TU457[建筑科学—岩土工程]