According to rock character of a certain soft rock tunnel of Chongqing, the model material is made from epoxy resin, polyamide, silicom rubber, firming agent of silicon rubber, quartz grit, powdery barite and gasoline...
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According to rock character of a certain soft rock tunnel of Chongqing, the model material is made from epoxy resin, polyamide, silicom rubber, firming agent of silicon rubber, quartz grit, powdery barite and gasoline. The physical model test of the unreinforced tunnel and bolt-reinforced tunnel are made in the true triaxial model test machine. By using strain measure technology, the strains of key parts of the surrounding rock and the bolt are measured;according to these data, the variability of the stress of surrounding rock and the variability of the axial force of the bolt are analyzed. The numerical simulation are made with the same boundary condition as the model test;according to these data, the plastic zone, stress field and the deformation of the surrounding rock are studied;the variation of the axial force of the bolt is studied. We compare the variation of stress of the surrounding rock and the variation of the axial force of the bolt of the model test with the numerical simulation and draw the conclusion that the two processes coincide with each other.
In order to solve the technical problem of how to deal with the insoluble interbeds during solution mining for oil/gas storage in multi-interbedded salt formation, a method for calculating the limit span of interbed r...
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In order to solve the technical problem of how to deal with the insoluble interbeds during solution mining for oil/gas storage in multi-interbedded salt formation, a method for calculating the limit span of interbed roof is presented. The influence laws of salt cavern leaching tactics on interbed collapse are revealed, and several technical measures to regulate and control collapse time of interbeds are given. According to the relevant research results and considering the technical characteristics of solution mining by means of the single well convection method, the collapse control technology for interbeds in solution mining for oil/gas storage in multi-interbedded salt formation is proposed. Finally, the application of collapse control technology for interbeds in increasing the available volume of caverns is illustrated by taking a salt cavern of Jintan as an example.
In the construction and operation processes of underground storage cavern in bedded salt, ground subsidence, even earth surface collapse accidents, resulted by the storage cavern contraction and overlying rock deforma...
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In the construction and operation processes of underground storage cavern in bedded salt, ground subsidence, even earth surface collapse accidents, resulted by the storage cavern contraction and overlying rock deformation is an important accident type. Aimed at the ground subsidence accidents caused by underground storage cavern, this paper reveals the mechanism and builds the fault tree model of this type of accidents, finds out 14 failure patterns as well as 10 basic influence factors, also, puts forward the related control measures. Then Yunmeng-Yingcheng salt mine is taken as an example to forecast the severity of accident consequence. On the premise that ground subsidence accident happened at Yunmeng-Yingcheng salt mine, the severity probability of the accident consequence is analyzed using fuzzy comprehensive evaluation. Research results show that the severity of accident consequence belong to negligible level, to be considered level, serious level, very serious level and calamitous level are 0.24, 0.28, 0.29, 0.15, 0.04 respectively. The results are useful to prevent ground subsidence accidents caused by the storage caverns. What's more, it also provides according theory and a feasible way for appraising the loss severity before the accident happening.
Hitherto, perilous rock is the weakest topic in disasters studies. Specially, damage of control fissure under loads is one key technique in study of develop mechanism of perilous rock. Damage division of end area of c...
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Hitherto, perilous rock is the weakest topic in disasters studies. Specially, damage of control fissure under loads is one key technique in study of develop mechanism of perilous rock. Damage division of end area of control fissure was defined by authors, then calculation methods of timed-Poisson＇s ratio and timed-Young＇s modulus were established in damage mechanics theory. Further, the authors set up damage constitutive equation of control fissure, which founds important basis to numerical simulation for control fissure to develop.
Velocities of solid phase and liquid phase in debris flow are one key problem to research on impact and abrasion mechanism of banks and control structures under action of debris flow. Debris flow was simplified as two...
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Velocities of solid phase and liquid phase in debris flow are one key problem to research on impact and abrasion mechanism of banks and control structures under action of debris flow. Debris flow was simplified as two-phase liquid composed of solid phase with the same diameter particles and liquid phase with the same mechanical features. Assume debris flow was one-dimension two-phase liquid moving to one direction, then general equations of velocities of solid phase and liquid phase were founded in two-phase theory. Methods to calculate average pressures, volume forces and surface forces of debris flow control volume were established. Specially, surface forces were ascertained using Bingham＇s rheology equation of liquid phase and Bagnold＇s testing results about interaction between particles of solid phase. Proportional coefficient of velocities between liquid phase and solid phase was put forward, meanwhile, divergent coefficient between theoretical velocity and real velocity of solid phase was provided too. To state succinctly before, method to calculate velocities of solid phase and liquid phase was obtained through solution to general equations. The method is suitable for both viscous debris flow and thin debris flow. Additionally, velocities every phase can be identified through analyzing deposits in-situ after occurring of debris flow. It is obvious from engineering case the result in the method is consistent to that in real-time field observation.
As one weak topic in research of debris flow,abrasion of debris flow shortens obviously application life of control structure composed of ***_speed drainage structure,one of the most effective techniques to control gi...
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As one weak topic in research of debris flow,abrasion of debris flow shortens obviously application life of control structure composed of ***_speed drainage structure,one of the most effective techniques to control giant debris flow disaster,has shortened one_third application life due to abrasion by debris *** on velocity calculation method founded by two_phase theory,research of abrasion mechanism of debris flow to high_speed drainage structure was *** mechanism includes both abrasion mechanism of homogeneous sizing and shearing mechanism of particle of debris flow to high_speed drainage trough *** abrasion equations of both sizing and particle were established by Newton movement theory of debris *** abrasion amount formula of the high_speed drainage trough structure is set up by dimensional *** to calculating in the formula is consistent with testing data in_situ,which is valuable in design of high_speed drainage structure.
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