Buried Impact Research Articles

Stowing Mining Technology in the Northwest Ecologically Fragile Areas

Northwest China is rich of coal energy. Mining activities bring serous impact on the environment and scarce water resources because of its shallow buried and severe mining impact. Stowing mining is one of the most effective measures to control strata movement and reduce surface subsidence. Based on the local surface widespread wind-blown sand for aggregate and combined with the knife pillar mining，this paper introduces the stowing mining technology.

Reconstruction Of The Subsurface Structure Of The Marquez Impact Crater In Leon County, Texas, Usa, Based On Well‐Log And Gravity Data

Abstract— In Leon County, Texas, USA, the Marquez Dome, an approximately circular 1.2 km diameter zone of disturbed Cretaceous rocks surrounded by shallow dipping Tertiary sediments, has been interpreted by Gibson and Sharpton (1989) and Sharpton and Gibson (1990) as the surface expression of a buried complex impact crater. New gravity and magnetic anomaly data collected over the Marquez Dome have been combined with well‐log and seismic reflection information to develop a better estimate of the overall geometry of the structure. A three‐dimensional model constructed to a depth of 2000 m from all available information indicates a complex crater 13 km in diameter with an uplift in the center of at least 1120 m. The zone of deformation associated with the cratering event is limited to a depth of <1720 m. No impact breccias were recovered in drilling at two locations, 1.1 and 2 km from the center of the structure, and the central uplift may be the only prominent remnant of this impact into unconsolidated, water‐rich sediments. The magnetic anomaly field shows no correlation with the location and extent of the structure.

Dynamic Responses of Shallow-Buried Flexible Plates Subjected to Impact Loading

The dynamic soil-structure interaction phenomenon involved in a shallow-buried flexible plate under impact loading is investigated both experimentally and numerically. This interaction causes load relief on the buried structure. Plexiglass plates were used as the buried flexible roof structure and low-velocity impact loadings were generated on the soil surface. Measurements of the interaction loads between the sand and the plate, and the accelerations of the buried plates were conducted. A decoupled single-degree-of-freedom model was used to simulate the dynamic responses of the buried flexible plates. The numerical model allows separation between soil medium and the buried structure. Different degrees of load-relief phenomenon are experimentally and numerically observed for the buried plates of three different stiffnesses. The numerical calculation shows good agreement with the experimental results. The results show that the stiffer plates experienced less separation from soil, which was observed in terms of higher loading magnitudes and longer loading durations. The same separation phenomenon was also observed in terms of lower displacement magnitudes and shorter durations.