To reduce the cost of backfilling coal mining and utilize the underground space of coal mines,a new backfilling mining method with low backfilling rate called constructional backfilling coal mining(CBCM)is proposed.Th...To reduce the cost of backfilling coal mining and utilize the underground space of coal mines,a new backfilling mining method with low backfilling rate called constructional backfilling coal mining(CBCM)is proposed.The "backfilling body-immediate roof" cooperative bearing structure of CBCM is analyzed by establishing the model of the medium thick plate on an elastic foundation.The influence of the backfilling rate on the stability of overlying strata is analyzed by the numerical simulation experiment.The control effect of CBCM is verified by a physic similar simulation test.The economic benefit of CBCM is analyzed.The conclusions are:the deformation characteristics of the immediate roof and critical backfilling spacing in CBCM can be analyzed based on the Hu Haichang’s theory.Exerting the bearing capacity of the immediate roof is beneficial to the stability of the overlying strata.The CBCM has a good control effect on the overburden in Xinyang Mine when the backfilling rate is lower than 25%.The backfilling cost of per ton coal is 37.39 yuan/t when the backfilling rate is 13.7%,with a decrease rate of 56.63%than the full-filling.The research results can provide theoretical support for the application of CBCM in coal mining.展开更多
Tidal sand ridges are large-scale linear bottom configurations in a good many tidal seas. The modern tidal sand ridges in Jianggang area, the northern part of Jiangsu Province, China, have attracted the attention of g...Tidal sand ridges are large-scale linear bottom configurations in a good many tidal seas. The modern tidal sand ridges in Jianggang area, the northern part of Jiangsu Province, China, have attracted the attention of geological circles because of the radial form and large scale. Berg, Brenner and Davies have reported that linear sand bodies of this kind were recognized within the Mesozoic strata of western America, but we have not seen any reports about the discovery of this kind of sediment from the ancient lithofacies analyses of China, especially in coal-bearing strata. Based on the study of sedimentary facies, this note describes the deposits of tidal sand ridges in the coal-bearing strata of China.展开更多
Considerable progresses in the sedimentologic studies of the anastomosing river models have been made in recent years. There are now many modern and ancient examples such as those described by Smith, Rust et al. Flore...Considerable progresses in the sedimentologic studies of the anastomosing river models have been made in recent years. There are now many modern and ancient examples such as those described by Smith, Rust et al. Flores et al. But all examples are found in the alluvial plains and the intermontane basins. None is known reporting about the upper delta plain environment. However, this type of distributary channels展开更多
Based on the AVO theoretical modeling of the coalbed, this paper analyzes the AVO characteristics and influencing factors of the coalbed P-P reflection wave. On the top interface of the coalbed, the P-P reflection wav...Based on the AVO theoretical modeling of the coalbed, this paper analyzes the AVO characteristics and influencing factors of the coalbed P-P reflection wave. On the top interface of the coalbed, the P-P reflection wave absolute value of reflective coefficient decreases when the incidence angle increases between 0 and 60 degrees, and then increases gradually. On the bottom interface of the coalbed, the total reflection occurs rather strikingly because the incident wave propagates from low impendence media to high one. And for the soft and fractured coal in particular, such a phenomenon takes place even at an incidence angle less than 15 degrees. So the reflection characteristics of the coalbed bottom interface are not conducive to AVO analysis. AVO response is closely relative to the coal structure, and AVO intercept and gradient of top interface of the coalbed reflection wave increases when the coal structure is destroyed severely. For coalbeds of the same coal structure, AVO intercept and gradient of the coalbed top interface with the sandstone roof is greater than that with the mudstone one. The tuning of coal-bed thickness has adverse influence on coalbed AVO attributes analysis obviously. Those AVO characteristics of coalbed are shown further by modeling from Well 9-10-15 and Well 10-E-3 in Huainan coalfield, China.展开更多
基金supported by the Youth Funds of National Natural Science Foundation of China(No.52004173)the Distinguished Youth Funds of National Natural Science Foundation of China(No.51925402)+2 种基金the Science and Technology Innovation Project of Colleges and Universities in Shanxi Province(No.2020L0066)the China Postdoctoral Science Foundation(No.2022M712922)the Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering(Nos.2021SX-TD001 and 2022SXTD008).
文摘To reduce the cost of backfilling coal mining and utilize the underground space of coal mines,a new backfilling mining method with low backfilling rate called constructional backfilling coal mining(CBCM)is proposed.The "backfilling body-immediate roof" cooperative bearing structure of CBCM is analyzed by establishing the model of the medium thick plate on an elastic foundation.The influence of the backfilling rate on the stability of overlying strata is analyzed by the numerical simulation experiment.The control effect of CBCM is verified by a physic similar simulation test.The economic benefit of CBCM is analyzed.The conclusions are:the deformation characteristics of the immediate roof and critical backfilling spacing in CBCM can be analyzed based on the Hu Haichang’s theory.Exerting the bearing capacity of the immediate roof is beneficial to the stability of the overlying strata.The CBCM has a good control effect on the overburden in Xinyang Mine when the backfilling rate is lower than 25%.The backfilling cost of per ton coal is 37.39 yuan/t when the backfilling rate is 13.7%,with a decrease rate of 56.63%than the full-filling.The research results can provide theoretical support for the application of CBCM in coal mining.
文摘Tidal sand ridges are large-scale linear bottom configurations in a good many tidal seas. The modern tidal sand ridges in Jianggang area, the northern part of Jiangsu Province, China, have attracted the attention of geological circles because of the radial form and large scale. Berg, Brenner and Davies have reported that linear sand bodies of this kind were recognized within the Mesozoic strata of western America, but we have not seen any reports about the discovery of this kind of sediment from the ancient lithofacies analyses of China, especially in coal-bearing strata. Based on the study of sedimentary facies, this note describes the deposits of tidal sand ridges in the coal-bearing strata of China.
文摘Considerable progresses in the sedimentologic studies of the anastomosing river models have been made in recent years. There are now many modern and ancient examples such as those described by Smith, Rust et al. Flores et al. But all examples are found in the alluvial plains and the intermontane basins. None is known reporting about the upper delta plain environment. However, this type of distributary channels
文摘Based on the AVO theoretical modeling of the coalbed, this paper analyzes the AVO characteristics and influencing factors of the coalbed P-P reflection wave. On the top interface of the coalbed, the P-P reflection wave absolute value of reflective coefficient decreases when the incidence angle increases between 0 and 60 degrees, and then increases gradually. On the bottom interface of the coalbed, the total reflection occurs rather strikingly because the incident wave propagates from low impendence media to high one. And for the soft and fractured coal in particular, such a phenomenon takes place even at an incidence angle less than 15 degrees. So the reflection characteristics of the coalbed bottom interface are not conducive to AVO analysis. AVO response is closely relative to the coal structure, and AVO intercept and gradient of top interface of the coalbed reflection wave increases when the coal structure is destroyed severely. For coalbeds of the same coal structure, AVO intercept and gradient of the coalbed top interface with the sandstone roof is greater than that with the mudstone one. The tuning of coal-bed thickness has adverse influence on coalbed AVO attributes analysis obviously. Those AVO characteristics of coalbed are shown further by modeling from Well 9-10-15 and Well 10-E-3 in Huainan coalfield, China.
