龙王沟煤矿位于内蒙古鄂尔多斯准格尔煤田中部，龙王沟煤矿主采6#煤层是近水平的特厚煤层，为了研究近水平特厚煤层在原始地层下与采空区下使用大采高大放高开采时矿压显现规律的异同，此次研究采用了理论分析、物理相似模拟、数值模拟方法对在原始地层下与采空区下进行特厚煤层大采高大放高开采时矿压显现规律进行对比研究。 理论分析方面，根据煤层上覆各岩层的厚度及岩性，经计算分析确定了直接顶、老顶及关键层的厚度和位置。计算了老顶、关键层的初次来压步距、周期来压步距等，这些分析计算从理论上说明了6#煤层开采时的覆岩运移规律及矿压显现规律。 物理相似模拟方面，通过实验室里的物理相似模拟，测得了在原始地层下以及采空区下开采时老顶的初次来压步距、周期来压步距，煤层底板支承压力分布，煤层上覆岩层的运移状况。物理相似模拟结合理论分析进一步明确了在原始地层下与采空区下开采时的矿压显现规律。 数值模拟方面，运用UDEC数值模拟软件模拟在原始地层下及采空区下开采6#煤层时上覆岩层的运移，结合物理相似模拟修正直接顶、老顶的初次跨落步距，老顶周期来压步距，关键层的断裂位置等，通过数值模拟加深了对煤层上覆岩层破断、运移的认识。 通过三种研究方法的相互借鉴、联系、修正，最后完成了对龙王沟煤矿特厚煤层在原始地层下与采空区下大采高开采矿压显现规律的对比研究。

Longwanggou colliery is located in north part of Zhun Ge Er coalfield，Erdous Coal-seam of north China strata . The Longwanggou mine 6# coal seam has two remarkable characteristics: extra thick and nearly flat coal seam . In order to comparative study extra thick and nearly flat seam by use of large mining height when under the original formation and in the under goaf.Strata pressure behavior law，this paper combines method including theory analysis，physical simulation and numerical simulation Theory analysis :on the basis of overlying strata thick and lithology the calculation method is confirmed immediate roof ，main roof and key stratum the height and position。Calculation first weighting span and cycle weighting interval These analyzes calculate theoretically explained overlying strata movement regularity and mine pressure behave law of 6# coal mine. Physical simulation: by laboratory physical simulation had measured under the original formation and in the under goaf mine coal seam first roof weighting pace cycle weighting interval coal floor abutment pressure and overlying strata movement .physical simulation combine theory analysis more clearly mine pressure behave law of under the original formation and in the under goaf. Numerical simulation:by the use of UDEC software,simulation overlying strata movement when 6# coal seam si mined of under the original formation and in the under goaf combine physical simulation correct result about immediate roof main roof first weighting and main cycle weighting interval key stratum fracture position.By numerical simulation more clearly mine pressure behave law. By Three research methods learning from each other contact and the amendment，finally the completion of a comparative study about longwanggou colliery extra thick seam large mining height strata pressure behavior law when under the original formation and in the under goaf.