Tunnel excavation is prone to segment cracks, which may lead serious safety accidents. This work aims investigate the type, location and occurrence time of cracks in a large-diameter underwater shield tunnel also ascertain causes cracks. The correlations between crack characteristics tunneling parameters were analyzed. effect jack deflection poor assembly on investigated using refined finite el...

In mechanized tunneling, so-called tunnel boring machines (TBMs) drill through the ground in an automatized manner. Therefore, drilling process is very efficient but maintenance costs are high. Seismic exploration seems appropriate to identify changing conditions front of TBM reduce from damages and corresponding dwell times. Today's seismic techniques using only a small amount information, whi...

In today’s grow older the unrestrained proprietorship is to vim adequate amount of data. In conventional approach if we need about several large scale, computing machines it is painful, but spasm a times it is possible by cloud computing. Boring Contrivance supports digress processing in very efficient manner. It is energetic to hand out and complementary a large-scale pursuit on choice machine...

The present study compares and analyzes three risk analysis models that are applicable to shield tunnel boring machine (TBM) tunneling, thus proposes an improved matrix model based on the causal networks sustainable projects. advantages disadvantages of compared, structured by analyzing relationship between factors events. Based comparison results, network-based (CN-Matrix model), which complem...

Practical Tunnel-boring Machine (TBM) guidance systems usually use sophisticated instruments to obtain the orientation of the TBM. These systems require frequent calibration and work shutdown, making the procedure complex and time consuming. Besides, the majority of current TBM guidance solutions cannot provide the position of the invisible cutter head analytically including commonly used laser...

While early machines adopted isolated syllable as input units and needed boring enrollment, our research focus on the speaker-independent, word-based dictation. A deliberately designed 120-speaker database was built for training ; inter-syllable context ,tonal and endpoint dependent acoustic model are applied with promising MFCC feature; Two-pass acoustic matching accelerates the recognition ma...

Chatter is a concern in boring process, due to the low dynamic stiffness of long cantilever boring bars. Chatter suppression in machining permits higher productivity and better surface finishes. The MR fluid, which changes stiffness and undergoes a phase transformation when subjected to an external magnetic field, is applied to adjust the stiffness of the boring bar and suppress chatter. The st...

The goal of the present research is to define size criteria for the design of specific machines for the distribution of pesticides in wine-growing context of Apulia Region, through the development of the experimental results. It was designed and realized a specific version of pulled straddle sprayer, air convection type, single-row, characterized by a spraying tunnel and a recovery system of th...

The paper presents results from three large scale experiments on seven reinforced concrete panels obtained during an extensive experimental program. This was aimed at possible application of cement reduced (fly ash replaced) concrete in the production of precast segmental linings for tunnels created by a tunnel boring machine (TBM). In particular, this paper is focused on the comparison of fire...