Generalizing the results of fracture zones study in the Upper Kama potassium salt deposit with the help of gravity study

Introduction. The history of the Upper Kama potassium salt deposit (VKMKS) exploration and operation should be divided into two periods. The first period lasted from 1929, the start of exploitation, until 1986, when the water-protective barrier collapsed and the largest VKMKS mine, the 3rd Berezniki mine, was flooded. The second period began in 1986 and continues to the present day. The first period is characterized by a low level of technogenic load on the geological environment, significantly less than its long-term strength. After 60 years of VKMKS large-scale exploitation, the technogenic load on the geologic environment has increased significantly. As a result, its equilibrium state was upset, giving rise to destruction, accompanied by various dynamic events: caves-in, surface collapses, rockbursts, and tectonic rockbursts. VKMKS structural-tectonic profile study revealed that active faults, nodal structures, and fracture zones have a decisive effect on the geologic environment equilibrium state. Research methodology. When structural and tectonic elements are formed in the supra-salt, salt, and subsalt strata of the deposit, the geologic environment density characteristic changes naturally leading to the development of local density inhomogeneities within. It is possible to locate these inhomogeneities and establish their relationship with structural and tectonic elements of the geological environment, particularly, fractured zones, only by studying the gravity field of the deposit. For this purpose, an areawide, detailed, and high-precision gravimetric survey was performed at a scale of 1:25,000, the results of which were used to identify and study the fracture zones. Research results. Based on the results of gravity field anomalies interpretation on the territory of VKMKS, the horizontal position and size of about 200 local negative linear anomalies of the near northsouth, north-east, and north-west orientations were determined, the sources of which were confidently identified with the fracture zones. Conclusions. The experience of studying the structural and tectonic structure of VKMKS has shown that currently for the deposit’s physical and geological conditions, the detailed, high-precision aerial gravity study is the most effective geophysical method for fracture zones mapping

Stability Analysis of Dangerous Rock Masses

Dangerous rock masses in south of a city, once destroyed, it will be a threat to peoples lives and property in downstream. In this paper, distributions and morphological characteristics are analyzed on the basis of studying its geologic environment and precipitating factors of instability. And it quantitatively analyzes and valuates the stability of number 2 and 17 single dangerous rock by means of planar slide method and analysis of engineering geology respectively. Studies show that number 2 is in an unstable state and number 17 is in a stable state. Consequently, the controlling suggestions associated with practical situation of the project are presented.

A Region of Coal Mine Geological Environmental Survey Assessment and Prevention Countermeasures

Exploitation and utilization of coal resources will cause disturbances to the geologic environment and damages to the geologic environment conditions of the mining area, and lead to damages to ecological environment, formation of geologic hazards of mines and environmental pollution in the mining area. In this paper, current geologic environment of mines is investigated, and geologic environment problems of mines are assessed and prevention and control measures are researched on a basis of classified areas, with Dazhou, which is an important city in East Sichuan and where coal resources are rich and exploited frequently, as an example, to provide reference for protection, treatment and recovery of geologic environment of coal mines in East Sichuan.

ĢEOLOĢISKĀ VIDE UN KODOLENERĢĒTIKAS CIKLA OBJEKTU EKOLOĢISKĀS DROŠĪBAS PROBLĒMAS

A discussion is presented of the methodological approach to assessment of stability of geologic environment in regions where nuclear cycle objects are located. A basis of assessment is the registration of dynamics of variation of the various factors and exterior energy in a hierarchical block of geologic environment.