Some Problems on Pneumatic DTH Drilling
liu jia-rong1; 2; wang jian-hua2; wang wen-bin3; xu liu-wan2(1.china university of geosciences; beijing 100083; china; 2.the institute of exploration techniques; cags; langfang hebei 065000; china; 3.shijiazhuang comprehensive geological team of hebei bureau of geology and mineral exploration; shijiazhuang hebei 050081; china)
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Application of Cast-in-place Bored Pile for in Soft Soil Area
xie shi-lian1; ding qi-feng2; lu yu-nan3(1.shanghai urban management college; shanghai 200438; china; 2.shanghai people s air defense engineering companies; shanghai 200030; china; 3.guangxi hualan geotechnical engineering co.; ltd.; nanning guangxi 530001; china)
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