Analysis of Situ Test Results of Earth Pressure and Pile Internal Force under Pile-Anchor Support in a Deep Foundation Pit in Xi’an

At present, in deep foundation pit engineering, on the one hand, practice is ahead of theory, and on the other hand, theory can not correctly reflect the actual construction process and environmental effects. In order to further study the distribution and change law of earth pressure and internal force of pile body in deep foundation pit pile-anchor supporting system, field monitoring test of earth pressure and pile body reinforcement stress was carried out. The monitoring results show that before excavation, the distribution of earth pressure has a great relationship with the layering of the soil, and it is distributed in sections along the depth. Compared with the theoretical static earth pressure, the measured data of the upper depth is relatively small; after excavation, the overall earth pressure is distributed along the depth in a “z” shape under the non-limiting state. As the excavation progresses, the magnitude of the reduction of the earth pressure varies from place to place, and the magnitude of the decrease of the soil with better properties is not large; after the excavation, the stress and earth pressure of the pile reinforcement correspond to each other, and the distribution is also nonlinear. The existence of anchor tension has an obvious effect on improving the internal force of the pile. The selected earth pressure calculation methods have some discrepancies in the calculation of the earth pressure value of the project, and they need to be further improved. The research in this paper can provide reference and reference for the calculation of earth pressure and support design of pile-anchor supported foundation pit.

Design of tension structures and shells using the Airy stress function

Discontinuities in the Airy stress function for in-plane stress analysis represent forces and moments in connected one-dimensional elements. We expand this representation to curved membrane-action structures, such as shells and cable nets, and graphically visualise the internal stresses and section forces at the boundary necessary for equilibrium. The approach enhances understanding of the interplay between form and forces and can support design decisions related to form-finding and force efficiency. As illustrative examples, the prestressing needed for three existing cable nets is determined, and its influence on the edge-beam bending moment is explored.

Support design of main retracement passage in fully mechanised coal mining face based on numerical simulation

For the comprehensive mechanised coal mining technology, the support design of the main withdrawal passage in the working face is an important link to achieve high yield and efficiency. Due to the impact of mining, the roof movement of the withdrawal passage is obvious, the displacement of the coal body will increase significantly, and it is easy to cause roof caving and serious lamination problems, and even lead to collapse accidents, which will affect the normal production of the mine. In this paper, the mining pressure development law of the main withdrawal passage support under the influence of dynamic pressure is designed, the most favourable roof failure form of the withdrawal passage is determined, and the action mechanism and applicable conditions of different mining pressure control measures are studied. The pressure appearance and stress distribution in the final mining stage of fully mechanised coal face are studied by numerical simulation. The deformation and failure characteristics and control measures of roof overburden in the last mining stage of fully mechanised coal face are analysed theoretically. Due to the fact that periodic pressure should be avoided as far as possible after the full-mechanised mining face is connected with the retracement passage, some auxiliary measures such as mining height control and forced roof blasting are put forward on this basis. The relative parameters of the main supporting forms are calculated. The main retracement of a fully mechanised working face in a coal mine channel is put forward to spread the surrounding rock grouting reinforcement, reinforcing roof, and help support and improve the bolt anchoring force, the main design retracement retracement channels in the channel near the return air along the trough for supporting reinforcing surrounding rock control optimisation measures, such as through the numerical simulation analysis, the optimisation measures for coal mine fully mechanised working face of surrounding rock is feasible. Numerical simulation results also show that the surrounding rock control of fully mechanised working face of coal mine design improvements, its main retreat channel under the roof subsidence, cribbing shrank significantly lower, and closer, to better control the deformation of surrounding rock, achieved significant effect, to ensure the safety of coal mine main retracement channel of fully mechanised working face support.

Automatic Monitoring System Designed for Controlling the Stability of Underground Excavation

Ensuring the stability of mining excavations is a crucial aspect of underground mining. For thispurpose, appropriate shapes, dimensions, and support of workings are designed for the given mining andgeological conditions. However, for the proper assessment of the adequacy of the used technical solutions,and the calibration of the models used in the support design, it is necessary to monitor the behavior of theexcavation. It should apply to the rock mass and the support. The paper presents the automatic systemdesigned for underground workings monitoring, and the example of its use in the heading. Electronicdevices that measure the rock mass movements in the roof, the load on the standing support, and on bolts,the stress in the rock mass, are connected to the datalogger and can collect data for a long of time withoutany maintenance, also in hard-to-reach places. This feature enables the system to be widely used, inparticular, in excavations in the vicinity of exploitation, goafs, or in the area of a liquidated exploitationfield.

Analysis of Foundation Pit Design of Metro Station in Complex Environment

The complex engineering geological conditions and the surrounding environmental conditions of the existing subway lines and adjacent buildings have significantly deepened the difficulty of metro station foundation pit design and construction. Based on the foundation pit project of Luboyuan Station of Nanjing Metro Line 9, this study chooses a reasonable foundation pit support design scheme to carry out related research by analyzing the site geological environmental conditions. Through the analysis and evaluation of the engineering geological conditions of the engineering site, the engineering geological problems that may occur in the process of construction are given. According to the lithologic characteristics of the site strata, the hydrogeological conditions, and the features of the underground engineering structure, the design of the foundation pit supporting system is optimized and analyzed. The results show that making full use of the geological features of strata and adopting effective support methods can ensure the safety of foundation pit construction, reduce the cost of engineering description, and shorten the construction period, which can be used as a reference for similar projects and construction.

A study of the potential for digital platforms to achieve design collaboration between homebuyers in the development phase of multi-user-oriented housing

<p>Urban development and densification are increasing rapidly; this fact has been globally reported. According to a 2014 United Nations report, the world population will increase by 25% in the next three decades. This significant growth means urban density will also increase drastically, creating an increase in high-rise apartment living quarters to cater for the population growth. Subsequently, the development of housing has been advancing - especially around construction techniques which are becoming more efficient to meet the demand of fast-growing urban populations. This thesis proposes that simply supplying housing is no longer sufficient to address the requirements of citizens. Denser living environments result in increased dissatisfaction, especially among those living in high-density housing. This research looks specifically into enabling homebuyers to voice their needs and design their living space. In this context, the social paradigm of high-density housing has not progressed much. There is still more a notion of supplying the needed quantity and homebuyers accepting the housing without question. Homebuyers, the main users of the housing, are often absent from both the planning and design process. Recent studies have shown that participation in their community is one of the key themes towards social sustainability. Many public participatory projects and platforms only allow participation in large scale urban developments and planning processes. There is a significant lack of initiatives that include homebuyers in the context of high-rise, high-density housing. The aim of this research is to explore how a computational tool within a virtual environment can facilitate and support design collaboration and interactions – not only between architects and homebuyers, but among individual and collective homebuyers too. The methodology of the research includes using focus groups to examine how digital tools can support and contribute to the collaborative design process of high-rise, high-density housing. The study is then tested with the public to determine if such design tools facilitate and support design collaborations. Three studies were undertaken: The first is a pre-tool development study. It uses a focus group to understand the factors necessary to engage homebuyers, and those factors that hinder such process. A digital tool for collaboration was then developed, based on analysis of the focus group results. A second study determines if the factors identified are sufficient for design collaboration within a digital environment. Based on this analysis, the tool was enhanced and integrated with third party visualisation software to enable the desired digital collaboration. A final study involves the public, examining whether such a design tool facilitates and supports their design collaborations. Throughout the research development, gamification techniques were introduced and adopted to further explore driving factors and to enhance design interactions. The target audience of this research is homebuyers, who are laypersons in architectural design processes and techniques. Gamification is, therefore, an effective technique to simplify the design process and enable homebuyers to immerse themselves in a collaborative design process. Virtual Reality is used at the final stage to immerse homebuyers further into the design environment and give them clearer feedback about their design decisions. The findings of the research confirm the benefits this novel collaborative design process has on the overall outcome of high-rise, high-dense buildings. It demonstrates how a virtual design tool can influence the process of consultation and procurement for homebuyers. A metadesign framework has been developed to provide a guide to the decision-making support necessary for such a collaborative design process. Finally, the research explains how such an enhanced communicative design operation can achieve the kind of synergies that break out of the current housing paradigm and take a major step forward in urban development.</p>

A study of the potential for digital platforms to achieve design collaboration between homebuyers in the development phase of multi-user-oriented housing

<p>Urban development and densification are increasing rapidly; this fact has been globally reported. According to a 2014 United Nations report, the world population will increase by 25% in the next three decades. This significant growth means urban density will also increase drastically, creating an increase in high-rise apartment living quarters to cater for the population growth. Subsequently, the development of housing has been advancing - especially around construction techniques which are becoming more efficient to meet the demand of fast-growing urban populations. This thesis proposes that simply supplying housing is no longer sufficient to address the requirements of citizens. Denser living environments result in increased dissatisfaction, especially among those living in high-density housing. This research looks specifically into enabling homebuyers to voice their needs and design their living space. In this context, the social paradigm of high-density housing has not progressed much. There is still more a notion of supplying the needed quantity and homebuyers accepting the housing without question. Homebuyers, the main users of the housing, are often absent from both the planning and design process. Recent studies have shown that participation in their community is one of the key themes towards social sustainability. Many public participatory projects and platforms only allow participation in large scale urban developments and planning processes. There is a significant lack of initiatives that include homebuyers in the context of high-rise, high-density housing. The aim of this research is to explore how a computational tool within a virtual environment can facilitate and support design collaboration and interactions – not only between architects and homebuyers, but among individual and collective homebuyers too. The methodology of the research includes using focus groups to examine how digital tools can support and contribute to the collaborative design process of high-rise, high-density housing. The study is then tested with the public to determine if such design tools facilitate and support design collaborations. Three studies were undertaken: The first is a pre-tool development study. It uses a focus group to understand the factors necessary to engage homebuyers, and those factors that hinder such process. A digital tool for collaboration was then developed, based on analysis of the focus group results. A second study determines if the factors identified are sufficient for design collaboration within a digital environment. Based on this analysis, the tool was enhanced and integrated with third party visualisation software to enable the desired digital collaboration. A final study involves the public, examining whether such a design tool facilitates and supports their design collaborations. Throughout the research development, gamification techniques were introduced and adopted to further explore driving factors and to enhance design interactions. The target audience of this research is homebuyers, who are laypersons in architectural design processes and techniques. Gamification is, therefore, an effective technique to simplify the design process and enable homebuyers to immerse themselves in a collaborative design process. Virtual Reality is used at the final stage to immerse homebuyers further into the design environment and give them clearer feedback about their design decisions. The findings of the research confirm the benefits this novel collaborative design process has on the overall outcome of high-rise, high-dense buildings. It demonstrates how a virtual design tool can influence the process of consultation and procurement for homebuyers. A metadesign framework has been developed to provide a guide to the decision-making support necessary for such a collaborative design process. Finally, the research explains how such an enhanced communicative design operation can achieve the kind of synergies that break out of the current housing paradigm and take a major step forward in urban development.</p>