Palaeo-karst collapse pillars in northern China and their damage to the geological environments

摘要: According to statistics, there are a total of 39 sites palaeo-karst collapse pillars in Northern China, as well 3,650 pillars. Through an overall survey and analysis the distribution regularities formation mechanisms northern coal mine regions, this paper found that rock structures, geological karst characters, underground hydrodynamic conditions neotectonic movement basic bases for rule them. Karst apparently have three south–north terms distribution, they resulted severe damages resources environment their areas: water inrush causing damage influencing impounding reservoirs stability dam sites. Based on features also introduces new methods integrated prospecting successive approximation determine hydraulic conductivity