Karst Paleo-Collapses and Their Impacts on Mining and the Environment in Northern China

Karst paleo-collapses are unique collapse structures widely found in the coal measures of northern China. Their geometric dimensions and internal properties indicate that a compound dissolution of carbonate and gypsum rocks may contribute to their formation. When these collapses are permeable to groundwater flow, they hydraulically connect the coal seams and the karst aquifers, which is a pre-requisite for water inrushes during coal mining. Over the last 40 years, water inrushes through these collapses have caused fatalities, economic losses, and degradation in the environment in northern China. Determination of locations and hydrogeological characteristics of the karst paleo-collapses are essential in preventing water inrush incidents through them. Advanced geophysical prospecting, aquifer testing and accompanied dye tracing are effective approaches to investigating these structures

Karst Paleo-Collapses and Their Impacts on Mining and the Environment in Northern China

Karst paleo-collapses are unique collapse structures widely found in the coal measures of northern China. Their geometric dimensions and internal properties indicate that a compound dissolution of carbonate and gypsum rocks may contribute to their formation. When these collapses are permeable to groundwater flow, they hydraulically connect the coal seams and the karst aquifers, which is a pre-requisite for water inrushes during coal mining. Over the last 40 years, water inrushes through these collapses have caused fatalities, economic losses, and degradation in the environment in northern China. Determination of locations and hydrogeological characteristics of the karst paleo-collapses are essential in preventing water inrush incidents through them. Advanced geophysical prospecting, aquifer testing and accompanied dye tracing are effective approaches to investigating these structures

Research on the Mechanism of REITs on China's Infrastructure Construction Under the Background of High-Quality Development

The long-term and high-speed investment in infrastructure construction in China has brought some adverse effects, which are mainly reflected in the low input-output ratio efficiency, prominent financing channel problems and higher debt leverage ratio. It is obviously inconsistent with the high quality economic development proposed by Our country. This paper briefly introduces the basic concepts and characteristics of REITs, lists some traditional financing methods and their disadvantages in the field of infrastructure, and highlights the advantages of infrastructure REITs. In the empirical part, based on the case of Soochow Suzhou Industrial Park, the benefits of REITs are quantitatively analyzed to explore the role that REITs can play in the development of infrastructure construction industry under the background of high-quality development.</jats:p