工程爆破

2018, v.24;No.105(05) 66-71

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特大悬索桥顺层山脊重力式锚碇基坑爆破开挖
Foundation ditch excavation blasting of gravity anchor in the ridge with bedding rock of grand bridge

廖德川;张丹;彭通州;
LIAO De-chuan;ZHANG Dan;PENG Tong-zhou;Sichuan Road and Bridge Construction Group Co.,Ltd.;

摘要(Abstract):

爆破开挖山脊重力式锚碇基坑,势必扰动溶蚀严重顺层山体,易致岩体塌落和岩层滑动,影响后期锚碇稳定,特别是类似于赤水河特大桥情况,控制爆破扰动至关重要。针对特大桥特殊的地貌,复杂的地质构造,结合锚碇基坑开挖轮廓设计线,依据爆破地震波能流密度分布主方向及其大小特征等爆源因素相干性等控制爆破理论,对特大桥顺层山脊重力式锚碇基坑爆破开挖参数进行研究,提出了适宜的开挖工艺,经监测岩层损伤在控制范围内。
The blasting excavation of the foundation ditch of gravity anchor in the ridge,seriously vibrate the corroded bedding mountain,can make rock mass collapse and rock formation slide,so that it may influence the stability of the the anchorage in the later state,especially the anchorage of the Chishui River grand bridge,so it is very important to control the blasting vibrations.On the basis of the special landscapes of the grand bridge,and complex geological structure,and the anchorage excavation contour line to design,in the light of the controlled blasting theory about the main direction and size of the blasting seismic wave energy density distribution and the explosion source factors such as the feature of the resistance line,studying on excavating the foundation ditch of gravity anchor in the ridge with bedding rock of the grand bridge by blasting,and so the suitable excavation technology is put forward,the detection result prove the damage of strata is within the control range.

关键词(KeyWords): 重力式锚碇;开挖工艺;溶洞;顺层岩;孔网参数;基坑
gravity anchor;excavation technology;karst cave;bedding rock;blasthole network parameters;foundation ditch

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作者(Author): 廖德川;张丹;彭通州;
LIAO De-chuan;ZHANG Dan;PENG Tong-zhou;Sichuan Road and Bridge Construction Group Co.,Ltd.;

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