Papers by Keyword: Deformation

Abstract: Deformation process of slope has been controlled by a variety of factors due to the unique geological, hydrological and meteorological conditions. And southwest mountain areas of China has been become high incidence areas of slope diseases during highway construction and operation. According to Wendu Road K55+590 ~ K55+670 left slope engineering geological environment, the deformation process and mechanism analysis, The key factor of the slope deforming destruction is proposed. the appropriate engineering treatments and the construction control measures are also proposed based on analysis.

Abstract: The monitoring is carried out for deformation of the soil-mixing-wall structures used in Baijihu subway station. The horizontal displacement of deep soil is obtained, as well as the ground subsidence around the edges of the foundation pit. Their variation rules under the influence of some factors, such as soil excavation and support settings etc, is analyzed. The results show that during the process of SMW construction, it is necessary to monitor the horizontal displacement of deep soil and the ground subsidence around the edges of the foundation pit, especially during the early stage of excavation.

Abstract: The working performance of gravity dam with an anti-arch shape differs from that of conventional gravity dams. To understand the working performance of anti-arch segments on the bank slope of Xiangjiaba dam, linear and non-linear finite element methods were used to analyze the deformation, stress as well as the state of transverse joint and cracks during the operation period. The coefficient of anti-sliding stability of each dam segment and the safety degree of dam body were also calculated. The results show that under the conditions of non-grouting of transverse joints and well grouting of cracks, the deformation rules are consistent for all segments investigated and accord well with that of the conventional gravity dam. Both the dam heel and dam toe are subjected to compressive stress. In the cold seasons, there is a tensile stress region on the top of the dam body, where the tensile stress is smaller than the tensile strength. The transverse joints are opened, while the cracks are generally closed under compression and stable on the whole. The anti-sliding stability coefficient and the safety degree of each dam segment are above 3.0, which satisfies the design code.

Abstract: Geotextile have been widely used in the reinforced retaining wall, but it is not easy to measure the deformation of the wall during and after construction. To assess the deformation stability of the reinforced retaining wall, an optical fiber sensor was used in geotextile. Based on the measurement accuracy of strain for the sensor geotextile, an actual geotextile-reinforced retaining wall was studied using the fiber sensor geotextile. The experimental results were compared with the results from a numerical procedure, which employs the Mohr-Coulomb yield criterion and an initial stress method and determines the plastic displacement at collapse represented by the distribution of yield elements. The comparison shows that the numerical results have a good agreement with the corresponding measurement values. The result shows the possibility that the procedure gives the realistic evaluation of long-term deformation of reinforced retaining wall.

Abstract: A synthesized investigation is conducted of trench formation machine’s effect on trench wall in soft soil area. The failure pattern of the slurry-trench is analyzed by means of 3D FEM based on strength reduction method. The investigation shows that the global instibility occurs in the superficial layers and speads along the trench segment. The grab movement in slurry has an instant impact on the trench wall and may cause local instability. The overload and construction technique of trench formation equipment are both important concerns during trench construction to ensure safetry.

Abstract: Setting bracing is conducive to stabilize formwork support in high-formwork system. ABAQUS was used to build the calculating model of high-formwork system to simulate and analyse lateral deformation of high-formwork in different column’s spacing of bridging. The results show, increasing column’s spacing of bridging can add the whole lateral displacement of high-formwork, but, it is not obvious. Increasing appropriately column’s spacing can save material during construction.

Abstract: With the rapid development of high-rise buildings in our country, the seismic design of structures is becoming more and more important. And the seismic performance of traditional seismic system is not perfect, there are still some room for improvement. This article points out the advantages of the human body vertebra seismic system by comparing the characteristics of the current building aseismic system with the deep analysis of the human body vertebra seismic system and the application of the seismic characteristics of the human body vertebra in seismic design of building structure application foreground is prospected.

Abstract: The thesis develops an non-equal time-interval GM (1, 1) model to forecast the deformation of the tunnel surrounding rock. A program is compiled via MATLAB 7.1 platform to implement the model. With the assistance of the program and the monitoring record of the convergence, the deformation is predicted and the error is analyzed. The numerical results indicate that the non-equal time-interval GM (1, 1) model does well in predicting the deformation of tunnel surrounding rock and is worthy to put into use in tunnel engineering.

Abstract: Under the condition of plane strain, a 2D elastoplastic FEM is used to analyze the behavior of composite soil nailing bracing of deep excavation, then finite element method of stability analysis is applied to evaluate the stability of the soil-nail wall. The authors analyzed the difference between composite soil nailing and normal soil nailing. Through analyzing the effect of bracing parameters on the deformation behavior and stability of the excavation, some useful conclusions are obtained to provide certain references for the design and construction of composite soil nailing.

Abstract: This article mainly expounds the importance of in-situ monitoring on the construction process of deep foundation pit. Taking the deep foundation pit of some Shenyang metro station for example, the deformation features of the supporting structure and the internal and external of foundation pit is analyzed, according to the monitoring data of the fender pile displacement during the excavation of deep foundation pit. The conclusion is obtained that the timely and accurate in-situ monitoring information is necessary to guaranteeing construction safety. We should pay more attention to the excavation speed and exert the interior support timely during the excavation of foundation pit to avoid large deformation and danger. The analytical results of monitoring data shows that the whole stage of foundation pit excavation is stable and the fender pile with internal supports can guarantee the stability of foundation pit.