Intrusive features and its influence of lamprophyre on coal seams and coal quality in tongxin mine field 同忻井田煌斑岩侵入特征及对煤层和煤质的影响
2.
As the increase of domestic high - rise buildings , more and more deep foundation trench supporting constructions have come into existence . among the general geographical condition of the urban district in qingdao , most of regions , which mainly consist of strong de composed rocks , are in quite good condition . except for the sandy soil and oozy soil along sea sides . but the development of rock cracks and breaking zones and unstable lamprophyre still exist , so blasting is needed during constructions of foundation trench . blasting have bad influence on the stability of slopes . moreover . the slope - liding has happened for several times , so the engineering project of foundation trench attracts more attention of people 随着国内高层建筑的发展，深基坑支护工程越来越多，综合青岛市区的地质状况，除海边有砂性土及淤泥软土外，大部分地域岩土条件相对较好，多以强风化岩为主，但岩石裂隙发育，间或有断裂带和稳定性极差的煌斑岩穿插其中，基坑施工时需要爆破施工，对边坡的稳定造成了不利影响，加之连续出现的几次滑坡失稳事件，基坑支护工程越来越引起了各方面的重视。
