Forecasting water disaster for a coal mine under the Xiaolangdi reservoir

Xin’an coal mine, Henan Province, faces the risk of water inrush because 40% of the area of the coal mine is under the surface water of the Xiaolangdi reservoir. To forecast water disaster, an effective aquifuge and a limit of water infiltration were determined by rock-phase analysis and long term observations of surface water and groundwater. By field monitoring, as well as physical and numerical simulation experiments, we obtained data reflecting different heights of a water flow fractured zone (WFFZ) under different mining conditions, derived a formula to calculate this height and built a forecasting model with the aid of GIS. On the basis of these activities, the coal mine area was classified into three sub-areas with different potential of water inrush. In the end, our research results have been applied in and verified by industrial mining experiments at three working faces and we were able to present a successful example of coal mining under a large reservoir.

Research and Application of In-seam Seismic Survey Technology for Disaster-causing Potential Geology Anomalous Body in Coal Seam

In order to effectively detect potential geology anomalous bodies in coal bearing formation,such as coal seam thickness variation,small faults,goafs and collapse columns,and provide scientific guidance for safe and efficient mining,the SUMMIT-II EX explosion-proof seismic slot wave instrument,produced by German DMT Company,was used to detect the underground channel wave with the help of transmission method,reflection method and transflective method.Region area detection experiment in mining face had been carried out thanks to the advantage of channel wave,such as its great dispersion,abundant geology information,strong anti-interference ability and long-distance detecting.The experimental results showed that:(1)Coal seam thickness variation in extremely unstable coal seam has been quantitatively interpreted with an accuracy of more than 80%generally;(2)The faults,goafs and collapse columns could be detected and predicted accurately;(3)Experimental detection of gas enrichment areas,stress concentration regions and water inrush risk zone has been collated;(4)A research system of disaster-causing geology anomalous body detection by in-seam seismic survey has been built,valuable and innovative achievements have been got.Series of innovation obtained for the first time in this study indicated that it was more effective to detect disaster-causing potential geology anomalies by in-seam seismic survey than by ground seismic survey.It had significant scientific value and application prospect under complex coal seam conditions.

Clinical efficacy of comprehensive therapy based on traditional Chinese medicine patterns on patients with pneumoconiosis: a pilot double-blind, randomized, and placebo-controlled study

Effective therapy options for pneumoconiosis are lacking.Traditional Chinese medicine(TCM)presents a favorable prospect in the treatment of pneumoconiosis.A pilot study on TCM syndrome differentiation can evaluate the clinical efficacy and safety of TCM and lay a foundation for further clinical research.A double-blind,randomized,and placebo-controlled trial was conducted for 24 weeks,in which 96 patients with pneumoconiosis were randomly divided into the control and treatment groups.Symptomatic treatment was conducted for the two groups.The treatment group was treated with TCM syndrome differentiation,and the control group was treated with placebo.The primary outcomes were the six-minute walking distance(6MWD)and the St.George Respiratory Questionnaire(SGRQ)score.The secondary outcomes were the modified British Medical Research Council Dyspnea Scale(mMRC),Chronic Obstructive Pulmonary Disease Assessment Test(CAT),Hospital Anxiety and Depression Scale(HADS),and pulmonary function.Only 83 patients from the 96 patients with pneumoconiosis finished the study.For the primary outcome,compared with the control groups,the treatment group showed a significantly increased 6MWD(407.90 m vs.499.51 m;95%confidence interval(CI)47.25 to 135.97;P<0.001)and improved SGRQ total score(44.48 vs.25.67;95%CI 27.87 to 9.74;P<0.001).The treatment group also significantly improved compared with the control group on mMRC score(1.4 vs.0.74;95%CI 1.08 to 0.23;P=0.003),CAT score(18.40 vs.14.65;95%CI 7.07 to 0.43;P=0.027),and the total symptom score(7.90 vs.5.14;95%CI 4.40 to 1.12;P<0.001).No serious adverse events occurred.This study showed that TCM syndrome differentiation and treatment had a favorable impact on the exercise endurance and quality of life of patients with pneumoconiosis.