Study On The Ancient Planation Surface Height Of Base System And Nappe Base On Acoustic Emission In No.2Coal Mine Of Xinji

No.2coal mine of Xinji is located in the southeastern margin of the North China Plate.Fufeng thrusts napped the alien system to base system from the south to the north because ofthe compressive stress from the south to the north. After researched the ancient stress of miningarea could inferred the mine tectonic movement time and analyzed the nappe moved to thenorth process. Then taking advantage of its alien stress restored the original height and theerosion thickness of ancient planation surface and analyzed the background of topography cyclein each phase to get a new way of researching ancient planation surface.Through the rock samples from drilling water0303did acoustic emission experiment.Using vertical compression mode to find the press when the rock samples produced Kaiserpoints. Then taking advantage of it to calculate the ancient stress when the rock samplesproduced Kaiser points.Taking advantage of ancient stress from acoustic emission experiment divided into fourphases and three stages of mine area tectonic movement. According to it the mine area tectonicmovement divided into three stages. The1st tectonic movement phase is the1ststage. Thisstage had happened in Yinzhi Movement. The tectonic movement produced from under cliporiginal strata. The under clip hadn’t got to base system. Fufeng nappe hadn’t got to the locationof under clip original strata, too. The2ndand the3rdtectonic movement phases is the2ndstage.This stage had happened in early Yanshan Movement. The tectonic movement produced fromFufeng nappe and under clip original strata when they moved to north. The alien system hadn’tgot to base system in the stage. The4thtectonic movement phase is the3rdstage. This stage hadhappened in late Yanshan Movement. The alien system got to base system and alien systemcontinued to push base system.At last estimating the original height and the erosion thickness of ancient planation surface.The height of original strata is bigger than now in1ststage. It reflected the tectonic movementactive in under clip original strata. In that time the feature were strong fold uplift because ofinternal forces and powerful cutting because of external force. In the stage the under cliporiginal strata erosion thickness was large maybe concerned with frequent tectonic activityinside. The height of nappe original strata small in2ndstage is general same than now. Itreflected the nappe was moving along strata. However, the height of under clip strata is largerthan now. It reflected under clip pushed each other and the under clip was abrasion when nappemoving to north. The height of relative modern horizon in nappe was smaller than1ststage. Itreflected nappe was denuded and uplifted when it moving. The erosion thickness of ancient planation surface are550m~720m. The all strata height of relative sampling points of had asignificant reduction in3rdstage. It reflected the nappe transport distance was long. The strataof alien system and base system were abrasion. The alien system height of relative horizon hada significant reduction, too. It reflected the ancient planation surface height had a significantreduction. The terrain was very flat and the erosion thickness of ancient planation surface wassmall from3rdstage to now. The coal mine area was sinking and accepting Quaternarysedimentary after produced Shouxian-laorencang fault.