Results 41 to 50 of about 361,142 (196)
Secondary frost heave in freezing soils [PDF]
, 1996 Frost heave describes the phenomenon whereby soil freezing causes upwards surface motion due to the action of capillary suction imbibing water from the unfrozen region below. The expansion of water on freezing is a small part of the overall surface heave
Noon, C.
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Study on failure characteristics and control of soft rock roadway floor
Meitan kexue jishu, 2023 In order to study the regularity of floor heave deformation and instability of soft rock roadway under different horizontal stress boundary conditions, the return air roadway of 50213 working face of Guantun Coal Mine was taken as the engineering ...
ZHANG Jie +7 more
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Meikuang Anquan, 2022 Aiming at the serious problem of floor heave of the high-stress deep roadway, take 4# bottom-draining roadway in the north wing of the first mining area of Chiyu Coal Mine as an example, the law of non-linear large deformation of the floor of the roadway
XIONG Huaixin +6 more
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Investigation and Treatment for Floor Heave of Highway Tunnels in Gansu Province
, 2023 With the increase of tunnel operational time, more and more tunnels have entered the period of high incidence of diseases. Among many tunnel diseases, floor heave is particularly prominent, which seriously affects the traffic and structural safety of tunnels.
Zhang, Gang +5 more
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Floor heave monitoring using floor instrumentation
, 2020 Several underground coal mines in Australia have recently reported and anticipated significant floor heave in gateroads during longwall retreat. Floor heave on longwall retreat is typically attributed to a stress notch.
Terri O'Sullivan (20180298) +5 more
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Meikuang Anquan, 2022 In order to solve the problem of roadway surrounding rock support caused by roadway floor heave along the filling body, taking Lu’an Changcun Coal Mine as the engineering background, the advantages and disadvantages of two control schemes such as floor ...
WU Jianbiao +3 more
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Energies, 2023 Due to their tense mining succession relationship, gob-side roadways may undergo significant deformation under multi-mining pressure. In this article, many methods, such as on-site research, a theoretical analysis, a numerical simulation and an ...
Deqiu Wang +11 more
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Concrete Deterioration and Floor Heave Due to Biogeochemical Weathering of Underlying Shale
Canadian Geotechnical Journal, 1975 When the basement floor of a church in the New Edinburgh area of Ottawa heaved, it was discovered that the concrete under the floor had been reduced to a mushy consistency due to attack by sulfate solution formed by the oxidation of pyrite in the underlying shale. Gypsum was the main product in the weathered zone of the shale. It is shown that heaving
Grattan-Bellew, P. E., Eden, W. J.
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Evaluation of heave prevention methods for floors founded on shale in the Ottawa Region
Canadian Geotechnical Journal, 1982 Heaving of floors founded on black shale in the Ottawa region is due to the oxidation of pyrite in it and the subsequent formation of jarosite and gypsum which crystallize between the layers of the thinly laminated fissile shale causing it to expand. Air must gain access to the shale for the oxidation reaction to occur.
Grattan-Bellew, P. E., McRostie, G. C.
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Deep Underground Science and Engineering, EarlyView.An experimental device for physical simulation of hydraulic fracturing, comprising: a load‐bearing mechanism with multiple interconnected plates that collectively form an sample chamber; a load‐generating mechanisms, with multiple load‐generating mechanisms arranged within the experimental chamber.
Delei Shang +5 more
wiley +1 more source