软弱顺倾岩体爆破层裂的准静态力学模型应用研究  

Applied study on a quasi-static mechanical model for lamination of weak intercalation in layered rock slope caused by blasting

作　　者：宋小林[1] 张继春[1] 郭学彬[2] 肖正学[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南科技大学环境工程学院,四川绵阳621002

出　　处：《爆炸与冲击》2008年第6期565-571,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目(50574076)

摘　　要：针对顺倾岩质边坡爆破引起软弱夹层冲刷、压密而影响边坡稳定的问题,应用爆轰气体等熵绝热膨胀理论,建立深孔爆破过程中软弱顺倾边坡的准静态力学模型,导出了爆炸作用在软弱夹层内形成爆腔后的准静态压力和软弱层临界层裂长度计算公式。通过分析爆轰气体楔入层面内对边坡岩体产生的抬动作用,推得了边坡潜在滑体的稳定系数与装药参数、岩体力学参数和边坡几何尺寸的定量关系。将提出的准静态力学模型应用于两个典型顺倾岩质边坡的爆破动力稳定分析,得到了与工程实际相符合的计算结果。Aimed at the stability analysis of layered rock slope affected by the erosion, impulse, and compaction of the weak intercalation caused by blasting, and applied on the theory that blasting gas is isoentropy adiabatic expansion in the lamination cracks and charge hole, the quasi-static mechanical model for the lamination of weak intercalation in layered rock slope was established during the deephole blasting. The explicit expressions of the quasi-static pressure in the blasting cavum and the critical lamination length of the weak intercalation were deduced. Through the study on the raise effect of the rock mass caused by the blasting gas wedging into the weak intercalation, the quantitative relationship between the stability factor of the latency slip and the parameters of charge, the mechanics parameters of the rock and the geometry size of the slope was obtained. The blasting dynamic stability of the two typical layered rock slopes was analyzed by using the quasi-static mechanical model presented in this paper. Analyzed results are in agreement with the engineering practice.

关 键 词：爆炸力学 准静态力学模型 岩体爆破 顺层边坡 软弱层 稳定性 

分 类 号：O383.1[理学—流体力学]