On the basis of summarizing the numerical simulation of groundwater systematically and combining Jinan fissure-karst water system, a two-dimensional unsteady flow model is established by using the finite difference me...
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On the basis of summarizing the numerical simulation of groundwater systematically and combining Jinan fissure-karst water system, a two-dimensional unsteady flow model is established by using the finite difference method and the finite volume method. And then the dynamic changes of groundwater in the spring field are assessed. Some conclusions are drawn so as to provide efficient analysis method for the evaluation and management of groundwater resources of the Jinan spring field;and provide significant reference for the evaluation of scientific management of local groundwater resources.
The mechanical behavior of supporting system for closely adjacent tunnels is the direct indication of its safety in the excavation of diverging tunnels;combined practical work of Miaoya diverging tunnel with small int...
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The mechanical behavior of supporting system for closely adjacent tunnels is the direct indication of its safety in the excavation of diverging tunnels;combined practical work of Miaoya diverging tunnel with small interval in Hu-Rong Expressway, the lateral reinforcement theory of inter-space rock and site monitoring of closely adjacent tunnels are introduced;based on the results, the deformation of surrounding rock and mechanical behavior of supporting system are presented;together with the study on the field experiments for blasting vibration of inter-space rock, the stability of closely adjacent tunnels is evaluated;and the conclusions obtained will devote to the following studies.
The importance and the monitoring measurement method of the highway tunnels are described. The principle and the process of intelligent back analysis are systematically expatiated. Through the real tunnel project, the...
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The importance and the monitoring measurement method of the highway tunnels are described. The principle and the process of intelligent back analysis are systematically expatiated. Through the real tunnel project, the intelligent back analysis of tunnel displacements is proved to be accurate and feasible;and it has important significances for the stability evaluation of tunnel adjacent rock and intelligent construction.
The diverging tunnel is a new promising tunnel used in communication construction in West China, Aimed at the problems involved in excavation and research of the large-span and shallow part of Miaoya diverging tunnel ...
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The diverging tunnel is a new promising tunnel used in communication construction in West China, Aimed at the problems involved in excavation and research of the large-span and shallow part of Miaoya diverging tunnel in Hu-Rong Expressway, excavation mechanics simulation with FLAC3D is introduced and site monitoring is proceeded at Miaoya diverging tunnel. Based on the results, the excavation mechanics analysis and site monitoring of wall rock deformation and the mechanical character of supporting system are presented;some conclusion is drawn by the analysis of classical geology part of this tunnel. The research will devote to the following studies.
Ascertaining the minimum rock covers of subsea tunnel is important to reduce project cost on the conditions of subsea tunnel safety. researching the dynamic influence of tunnel blasting construction on the cover rock ...
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Ascertaining the minimum rock covers of subsea tunnel is important to reduce project cost on the conditions of subsea tunnel safety. researching the dynamic influence of tunnel blasting construction on the cover rock mass is necessary to the minimum rock covers. The effect of subsea tunnel construction using drilling and blasting method to overlaying strata is analyzed through FLAC3D numerical simulation. The influence of different subsea tunnel level and charge weight on the interface of overlaying strata is analyzed. The blasting vibration velocity history and stress vibration history at key points and the plastic zone are gained and contrasted with the result of experimental formula;synthesizing the above analysis and considering economical and safety of subsea tunnel, we suggest that charge weight should be reduced and subsea tunnel level should be descended 2meters.
According to the geological section of the Xiangshan Harbour subsea tunnel, the tunnel axes of nine sections selected are researched and analysed. The appropriate tunnel axis of each section is fixed on through liftin...
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According to the geological section of the Xiangshan Harbour subsea tunnel, the tunnel axes of nine sections selected are researched and analysed. The appropriate tunnel axis of each section is fixed on through lifting and shifting the tunnel axis according to the thickness of bedrock. The paper applies the finite element program of fracture damage model to analyze different cases of the sections. Analyzing their damage zones, plastic zones, stress state and displacement variation in all the cases, the stability of the tunnel is studied. Based on the above analysis, the most appropriate tunnel axis position of every section is proposed.
Ground penetrating radar (GPR), a new electromagnetic instrument, has been quickly developed to meet the requirement for fast probing underground obstacle, precisely. The mechanism of underground pipeline detection wi...
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Ground penetrating radar (GPR), a new electromagnetic instrument, has been quickly developed to meet the requirement for fast probing underground obstacle, precisely. The mechanism of underground pipeline detection with ground penetrating radar is studied;and equation of the curve is deduced. By the detailed analysis of example, the method to collect radar data and interpret the radar profile under complicated condition is studied;the processing method and experience such as one-dimensional filtration, migration processing and time-depth conversion are introduced;and it is proved that the method is feasible and it has good foreground, in application.
The coal mining under seabed has great importance and long strategic significance on the development of coal industry in China, which indicates that the coal resources exploitation has entered into a new history perio...
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The coal mining under seabed has great importance and long strategic significance on the development of coal industry in China, which indicates that the coal resources exploitation has entered into a new history period of coal mining under seabed. Through the forecast research and the test of the actual measurement, the paper opens up the movement rule of cover rock when the mining technology of the top coal caving is adopted in the soft coal bed. It establishes the foundation on achieving safe coal mining under seabed with high efficiency.
A 3D numerical simulation of high slope excavation in left abutment of a large hydropower station is carried out with a program 3D-σ. The result of analysis shows that the tensile stress zone exists at top of slope s...
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A 3D numerical simulation of high slope excavation in left abutment of a large hydropower station is carried out with a program 3D-σ. The result of analysis shows that the tensile stress zone exists at top of slope surface after excavation;the rock mass deformation in the horizontal direction and vertical direction appears at the bottom of spandrel groove and the cable-crane platform;excavation of spandrel groove leads to unloading relaxation and deterioration of surface rock mass in the mountain No.5;and the large block above the fault f42-9 will be a potential threat;all the above will be the focal point of slope support at excavating step by step. According to analysis above, supporting measures after excavation are carried out including combination supporting measures of prestressed cable and drain to cut the water. The result shows that the supporting measure is effective, which meets the needs of project design.
A cellular automaton method is presented to simulate rock failure. Force and displacement are taken as the basic state variables. Based on the basic mechanical laws vector updating rules are constructed, which overcom...
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A cellular automaton method is presented to simulate rock failure. Force and displacement are taken as the basic state variables. Based on the basic mechanical laws vector updating rules are constructed, which overcomes the shortcomings of arbitrary decision of local rules and scalar variables. Based on this cellular automata model, rock failure process is simulated under uniaxial tensile conditions. And the influences of heterogeneity and sample shape on uniaxial tensile strength are studied. The results reveal uniaxial tensile behavior of rock and guide the uniaxial tensile experiments.
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