四川盆地近水平红层岩体崩塌块径特征研究  

Study on the Dimension Characteristics of Collapse Rocks in Nearly Horizontal Red Beds over the Sichuan Basin

作　　者：张淳 蹇黎明 李夺 ZHANG Chun;JIAN Liming;LI Duo(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;Sichuan Kangxin Expressway Co.,Ltd.,Ganzi 626000,Sichuan,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756 [2]四川康新高速公路有限责任公司,四川甘孜626000

出　　处：《路基工程》2024年第3期1-7,共7页Subgrade Engineering

基　　金：中国国家铁路集团有限公司重点课题(N2021G008)。

摘　　要：四川盆地近水平红层多为砂、泥岩交互,在构造和风化作用下,易诱发崩塌灾害。选择4处研究区,实地测量砂岩层层厚、节理间距及岩层倾角,调查崩塌体三维尺度上的块径特征并研究其与节理间距、层厚之间的对应关系。分析发现:缓倾砂岩层其层厚与所发育节理间距之间呈极显著正相关,且二者近似满足1∶1的比例关系。结合节理间距为崩塌块径主控因素这一性质,得出由层厚预测崩塌体体积的方法,提出近水平红层崩塌落石危害预测的判别依据。The nearly horizontal red beds are widely distributed in the form of sand-mudstone interbeds in the Sichuan Basin,which is prone to collapse under tectonic and weathering forces.Four research areas were selected based on the principle of decentralized layout in the red beds'distribution area to measure the sandstone layers'thickness,joint spacing and dip angle.Furthermore,the dimension characteristics on the three-dimensional scale of the collapse rocks in the area were investigated.The corresponding relationship was studied between the surveyed parameters with joint spacing and layer thickness.The analysis revealed that a significant positive correlation approximately meets the ratio of 1:1 between the thickness and the developed joint spacing of the low-dip sandstone layers.Combined with the deduction that joint spacing is the main control factor of collapse rocks'dimension,the calculation method of the collapse rock volume by layer thickness was obtained.The judgmet basis of rock fall hazard prediction of near-horizontal red layer is put forward.

关 键 词：盆地岩体 小倾角 崩塌落石 节理间距 块径特征 灾害预测 

分 类 号：P642[天文地球—工程地质学]