由于进行多次、大规模爆破成腔试验研究存在一定难度,本研究采用爆炸流体动力学数值分析方法,模拟土中爆腔形成和周围土体挤密效果。对现场爆破试验采集到的爆炸波波速进行分析,推导出土壤的相关参数,然后采用基于ANSYS/LS-DYNA中多物质ALE 算法,对土中爆破成腔进行分析,得到爆腔大小与土体压实度关系以及爆腔周围土体密度随爆心距变化关系,爆破成腔数值模拟结果与现场爆破试验结果具有较好的一致性。
Since there is a certain degree of difficulty to carry out a large number of large-scale blasting experiment studies, this paper uses an explosive fluid dynamics numerical analysis method to simulate the explosion cavity formation and the effect of soil compaction around the explosion cavity. First the explosion wave velocity collected from blasting test are analyzed to derive the relevant parameters of the soil, and then with the ANSYS/LS-DYNA ALE algorithm for multiple materials, the problem about blasting the cavity of the soil is analyzed. The relation between the explosion chamber and the degree of compaction of soil before blasting, and how the soil density around the explosion chamber changes with the blasting distance are obtained. There is a good agreement between the blasting results of numerical simulation and field blasting test results.
[1] Elliott R E, Clarke L, Gohl B, et al. Explosive compaction of foundation soils for the seismic upgrade of the seymour falls dam[C]. 35th Annual Conference, International Society of Explosives Engineers, Denver, USA, February, 2009.
[2] 蔡德钩, 叶阳升. 爆炸法处理地基技术[J]. 铁道建筑技术, 2005(1): 63-64. Cai Degou, Ye Yangsheng. Blasting method for foundation treatment technology[J]. Railway Construction Technology, 2005(1): 63-64.
[3] 潘强. 爆炸荷载作用下土体压密效应研究[D]. 成都: 西南交通大学, 2010. Pan Qiang. Study of soil compaction effect by blast loading[D]. Chengdu: Southwest Jiaotong University, 2010.
[4] 魏连雨, 刘艳竹, 马士宾, 等. 高填方路堤软弱区域爆破挤密技术[J]. 科技导报, 2014, 32(15): 49-52. Wei Lianyu, Liu Yanzhu, Ma Shibin, et al. Explosive compaction technology of the weak area of the high-filled embankment[J]. Scince & Technology Review, 2014, 32(15): 49-52.
[5] 韩宝成, 王丽琼, 冯长根. 集中药包土中爆炸成腔的三维数值模拟[J]. 计算机仿真, 2002, 19(4): 86-88. Han Baocheng, Wang Liqiong, Feng Changgen. The 3-D numerical emulation of spherical charge blasting in soils[J]. Computer Simulation, 2002, 19(4): 86-88.
[6] 王仲琦, 张奇, 白春华. 爆炸挤压粘土密度变化过程的数值模拟[J]. 岩 土工程学报, 2001, 23(3): 350-353. Wang Zhongqi, Zhang Qi, Bai Chunhua. Numerical simulation on variation of density of the soil compacted by explosion[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(3): 350-353.
[7] 陈同军. 炸药埋深及炸药量对土中爆炸效应影响规律的数值模拟研 究[D]. 长沙: 国防科学技术大学, 2010. Chen Tongjun. Numerical simulation of the amount of explosives and the explosives depth impact on explosive effects[D]. Changsha: National University of Defense Technology, 2010.
[8] 叶海旺, 王进. 节理岩体爆破数值模拟[J]. 爆破, 2009(4): 13-16. Ye Haiwang, Wang Jin. Numerical simulation of blasting in rockmass with joints and fractures[J]. Blasting, 2009(4): 13-16.
[9] 皮爱如, 沈兆武, 王肖钧. 土壤冲击特性的实验研究[J]. 振动与冲击, 2003, 22(3): 28-29. Pi Airu, Shen Zhaowu, Wang Xiaojun. Experimental study of impact characteristic of soil[J]. Journal of Vibration and Shock, 2003, 22(3): 28-29.
[10] 俞儒一, 赵洪顺, 黄士兴, 等. 压缩波在饱和软土中的传播试验[J]. 爆 炸与冲击, 1982(4): 43-48. Yu Ruyi, Zhao Hongshun, Huang Shixing, et al. Propagation testing of compressional wave in saturated soft soil[J]. Blasting and Punching, 1982(4): 43-48.
[11] 骆文海, 浩华. 土中应力波及其测量[M]. 北京: 中国铁道出版社, 1985: 42-71. Luo Wenhai, Hao Hua. Stress wave in soil and its measurement[M]. Beijing: China Railway Press, 1985: 42-71.
[12] 钱七虎, 王明洋. 岩土中的冲击爆炸效应[M]. 北京: 国防工业出版 社, 2010: 52-244. Qian Qihu, Wang Mingyang. Shock and explosive effect in rock and soil[M]. Beijing: National Defense Industry Press, 2010: 52-206.
