Papers by Author: Yu Suo Wang

Abstract: In order to analyze the construction processing for No.1 shaft of Weihe Tunnel on Baoji-Lanzhou Passenger-dedicated Railway, a two-dimensional numerical model for the simulation of the shaft was built with the finite difference method. Mohr-Coulomb model was chosen as the soil constitutive model. The result shows that the maximum lateral displacement appears at the upper part of the shaft, and the lateral displacement is in effective constraint at the shaft’s bottom. After the construction, the maximum uplift at the shaft’s bottom is in the center, while the uplift decreases from the shaft’s center to its both sides. The maximum pressure stress turns up at the bottom sides of the shaft, and the maximum tensile stress appears at the middle of the shaft.

Abstract: Rock strength is a key factor in the tunneling efficiency of TBM construction. An issue needing special attention on the work site is how to determine rapidly and accurately the strength of the surrounding rock which makes a crucial reference for the choice of TBM tunneling parameters and corresponding support measures. In the study conducted on the TBM construction site of Zhongtianshan Tunnel, point load test (PLT) of rocks is adopted to measure the rock strength and the data is compared with those of the uniaxial compressive strength (UCS). Finally, the correlation between the two is revealed through regression analysis method.

Abstract: Measurement of the loose zone of tunnel surrounding rock is of great significance in the determination of its support measures and stability analysis. By identifying the loose zone, the effective measures can be adopted to ensure a safe tunnel construction. The ultrasonic test is conducted to the TBM construction of Zhongtianshan Tunnel to specify the disturbance range of the TBM construction on the surrounding rock and the anchoring lengths of bolts.

Abstract: Considering the effect on surrounding rock exerted by TBM construction and its corresponding support measures are quite different from those of drilling and blasting construction, this study attempts to investigate the disturbance of TBM construction and its countermeasures. The investigation specifies the size of the drop pieces, position and cause and provides support measures for different stability condition of surrounding rock.

Abstract: On conditions of different weight and height, the tunnel portal structure’s accelerations evoked by rock-fall impaction have been researched in laboratory by using a 1/30 scale similar model. The study shows that the normal acceleration value is the biggest, the lateral acceleration is second and the longitudinal acceleration is the minimum. There is a simple linear relationship between the structure’s acceleration, the rock weight and the rockfall height when the slope gradient is 1:0.5 and the slope surface is slippery. The multiple linear relationship between the structure’s normal acceleration, the rock weight and the rockfall height has been obtained.

Abstract: On conditions of different weight，height, shape and the property of slope surface, the tunnel portal structure’s deformation evoked by rock-fall impaction has been researched in laboratory by using a 1/30 scale similar model. The study shows that there is a simple linear relationship between the structure’s deformation , the rock weight and the rockfall height when the slope gradient is 1:0.5 and the slope surface is slippery and the multiple linear relationship between the structure’s deformation , the rock weight and the rockfall height has been obtained. Effect of the shape of the rockfall and the property of slope surface on structure’s deformation has been comparative analyzed.

Abstract: On conditions of different weight，height, shape, slope gradient and the property of slope surface, the tunnel portal structure’s strain evoked by rock-fall impaction has been researched in laboratory by using a 1/30 scale similar model. The study shows that there is a simple linear relationship between the structure’s strain , the rock weight and the rockfall height when the slope gradient is specific and the slope surface is slippery and the multiple linear relationship between the structure’s strain , the rock weight and the rockfall height has been obtained. Effect of the shape of the rockfall and the property of slope surface on structure’s strain has been analyzed; The distribution characteristics of the structure’s strain of different parts of one cross-section and the same parts of different cross-sections has been comparative analyed.

Abstract: The long-retention of antibiotics in Calcium Phosphate Cement (CPC) may induce the development of drug resistance. Fast-releasing CPC containing antibiotics (FRCPC) was proposed as a solution to this problem and studied in this work. The FRCPC containing different proportions of soluble component were prepared and characterized. The setting time, compressive strength, degree of the conversion, in vitro antibiotic release and fracture surface morphology of FRCPC were studied. The results showed that the setting time increased, the compressive strength decreased, the in vitro antibiotic release accelerated with increasing fraction of soluble component in FRCPC. The setting time and compressive strength of FRCPC containing 20 wt% soluble components were close to the requirements of clinical applications, and the in vitro release was completed within 7 d. These results mentioned above showed that the FRCPC with suitable proportions of soluble components may prevent the development of drug resistance and may find applications in clinics.

Abstract: The energy method was used to analysis the flexural property of acrylate waterproof membrane in local loads during the period of construction and service. The membrane was formed by spraying-membrane waterproof technique for tunnel engineering. The maximum central deflection of the clamped circular plate was calculated in the uniformly distributed and concentrated loads. The minimum safety thickness was calculated in theory during the course of using. It was expected to provide theoretical reference for the further improving of spraying-membrane waterproof technique.