岩石时效损伤模型及其在工程爆破中应用  

Time effect damage model of rock mass and its application to blasting engineering

作　　者：王志亮[1] 郑田中 李永池[1] 

机构地区：[1]中国科技大学近代力学系,合肥230022 [2]浙江温州市水利局堤塘管理处,温州325000

出　　处：《岩土力学》2007年第8期1615-1620,共6页Rock and Soil Mechanics

摘　　要：为了实现爆破智能化,降低爆破带来的负面影响,通过数值模拟预估出岩体中爆破诱发损伤的大小以及分布范围在工程上具有重要意义,其中科学合理的爆破损伤模型是关键。基于岩石介质是连续的、各向同性的、且存在初始裂纹的假设,把考虑时效的岩石拉裂损伤演化方程和双线形弹塑性本构结合起来,通过用户自定义简明地嵌入到大型LS-DYNA软件中,并引入了该软件中的侵蚀算法,对半无限岩体中临空面附近爆破漏斗问题进行了重点数值模拟,计算结果比较接近实际。本文方法在工程中将具有一定的参考价值。In order to achieve intelligent blasting and reduce the blast-induced adverse influences, the prediction of rock damage and its distribution scope through numerical simulation is of importance in engineering. Thereinto, the reasonable damage constitutive model for rock is crucial. By assuming that the rock mass is an isotropic and continuous material with pre-existing random initial microcracks, an available rock tensile damage evolution equation considering time effect is coupled with the bi-linear elastoplastic constitutive model. Then they are succinctly incorporated into the transient dynamic code, LS-DYNA, via its user defined subroutine. In addition, the erosion algorithm in LS-DYNA is employed. The tensile damage and blasting crater near the free-surface of semi-infinite rock mass is numerically simulated; and the numerical results are satisfactory. This method presented herein has some reference value in rock blasting.

关 键 词：爆破 微裂纹 时效损伤 侵蚀算法 爆破漏斗 数值模拟 

分 类 号：TU452[建筑科学—岩土工程]