Safety analysis of building foundations over old goaf under additional stress from building load and seismic actions

Xu, Ping; Mao, Xianbiao; Zhang, Minxia; Zhou, Yuejin; Yu, Bangyong

doi:10.1016/j.ijmst.2014.03.030

Cited by 13 publications

(5 citation statements)

References 5 publications

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“…The stability of a foundation can be quantitatively evaluated before a new building is built on the ground of an old goaf according to the spatial relationship between the depth of the load influence and the height of the caving fracture zone of coal seam (Xu et al, 2014;Liu et al, 2015;Zhang et al, 2019). Ren et al (2022) chose an optimal algorithm to calculate the influence depth of the train load and the development height of the caving fracture zone.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis and numerical simulation of foundation in old goaf under building load

Zhang

Li²,

Li³

et al. 2023

Front. Earth Sci.

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This study comprehensively analyzes the safety and stability of old goaf under construction engineering based on specific projects using a variety of research methods. The Beijing Mentougou mining area is used as the research background. The methods of field investigation, laboratory testing, engineering drilling, geophysical exploration, theoretical calculation, and numerical simulation are combined to quantitatively analyze the stability of the foundation and ground buildings in old goaf. The influence depth of the building load and height of the caving crack zone are calculated using the “three-zone theory” to judge if the goaf is at risk of activation. Further simulation is conducted using two types of finite element analysis software, which increases the reliability of the numerical analysis. The results demonstrate that uneven subsidence of approximately 100 mm occurs in the buildings and ground surface, and subsidence of approximately 50 mm occurs in the goaf roof. It is also proven that goaf affects the stability of the surrounding rock and building foundation. Finally, a goaf treatment scheme is proposed. The treatment effect is found to be remarkable through field tests and numerical simulations, ensuring the safety and stability of a building foundation. The combination of theoretical calculation and numerical simulation can effectively evaluate the safety and stability of the project under load, and has a strong promotion and application value. The research results meet the needs of engineering practice, and provide a great reference value for the rational utilization of the land above the old goaf in the Mentougou district of Beijing and similar mining cities, which has a good theoretical significance and application prospect.

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Section: Introductionmentioning

confidence: 99%

Stability analysis and numerical simulation of foundation in old goaf under building load

Zhang

Li²,

Li³

et al. 2023

Front. Earth Sci.

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“…Guo et al (2004), Tong et al (2013) and Gao et al (2014) summarized the activation deformation of the goaf foundation under dynamic loads and pointed out that the calculation of goaf deformation under dynamic loads is almost blank. Xu et al (2014), Wang et al (2019) and Guo et al (2021) calculated the influence depth of additional building loads through numerical simulation. Wang (2013) used the mechanical balance analysis method to obtain the calculation formula of the critical depth.…”

Section: Introductionmentioning

confidence: 99%

Impacts of train-induced dynamic loads on goaf foundation of Qinshui coalfield

Wang

Zhou²,

Cheng³

et al. 2023

Front. Earth Sci.

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For the high-speed railway built in the goaf sites, if the influence depth of the additional loads reaches the collapse fault zone of the goaf foundation, the overburden rock mass above the mined area will move again, causing the surface to deform again, which seriously threatens the construction, operation, and maintenance of the high-speed railway lines. Therefore, in order to improve the safety and stability of operation of high-speed railway in goaf sites, it is essential to determine the activation deformation of the goaf foundation. In this paper, based on the additional stress method, the newly added embankment materials are taken as uniformly distributed strip static loads, and the high-speed railway in operation is regarded as the fluctuation-concentrated dynamic loads. The 1/4 vehicle vibration model with two degrees of freedom is introduced, and the influence depth of the additional loads of the goaf foundation is calculated. The criterion of activation is proposed based on the relationship between the influence depth of additional loads and the height of the collapse zone and fault zone. Conclusions drawn are as follows: i) the activation judgment criterion for the goaf foundation under the influence of high-speed railway vibration loads is recommended; ii) case study shows that the rail surface vibration model applicable to quantify the influence depth of high-speed railway mentioned previously mined-out regions; iii) the influence of rail surface irregularity on influence depth cannot be ignored; iv) the research conclusion can provide reference for site selection of high-speed railway and embankment deformation analysis.

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“…With the development of China's economy, there are more roads, railways and large buildings, and the available land resources tend to be scarce. It is difficult to avoid construction work at sites with an underlying abandoned goaf [4]. To realize the construction of buildings (structures) at the site of an abandoned goaf, it is necessary to accurately evaluate and dispose of the abandoned goaf.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Compressive Geophysical Prospecting Method for the Identification of the Abandoned Goaf at the Tengzhou Section of China’s Mu Shi Expressway

Zhang

Jiang

et al. 2022

Sustainability

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Subsidence deformation of abandoned goafs can induce cracking, distortion and even collapse of surface buildings (structures), and thus, subsidence deformation poses a great threat. Accurate detection of the abandoned goaf location and overburden morphology is an important prerequisite for stability evaluation and scientific management of surface buildings (structures), and effective detection methods are bottlenecks for accurate detection. Taking the abandoned goaf in the Tengzhou section of China’s Mu Shi expressway as an engineering example, step-by-step detection, traditional detection and combination methods are used to determine the location of the underlying abandoned goaf and overburden morphology. First, we conduct disaster investigation on the expressway and surface within the affected area of the abandoned goaf and initially determine the detection area. Then, according to the principle that the detection range can be examined step-by-step from large to small, the high-density resistivity method is used for detection, and the high-resolution seismic method is further selected to analyze the target area. Then, based on the results of the resistivity method, the position of the abandoned goaf is evaluated with the high-resolution seismic method, and the distributions of the overburden subsidence, the water-filled fractured zone and the caving zone (the three belts) are determined. Finally, boreholes are drilled deep into the bottom of the abandoned goaf at specific locations and the distributions of the abandoned goaf and three belts are verified and corrected with drilling data, acoustic detection and borehole TV imaging technology, thereby providing accurate data on abandoned goafs for highway stability evaluation.

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Safety analysis of building foundations over old goaf under additional stress from building load and seismic actions

Cited by 13 publications

References 5 publications

Stability analysis and numerical simulation of foundation in old goaf under building load

Stability analysis and numerical simulation of foundation in old goaf under building load

Impacts of train-induced dynamic loads on goaf foundation of Qinshui coalfield

Evaluation of Compressive Geophysical Prospecting Method for the Identification of the Abandoned Goaf at the Tengzhou Section of China’s Mu Shi Expressway

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