Michael Mooney's research while affiliated with Colorado School of Mines and other places

Publications (42)

Article
This paper combined data-driven modeling and optimal control for performance enhancement of earth pressure balance tunnel boring machine (EPBM). Two coupled processes, EPBM advance rate (AR) and cutterhead rotation torque, are modeled using support vector regression (SVR). An optimal control framework was formulated to maximize the AR, solved with...
Article
The scope of geotechnical investigations in tunnel projects is generally driven by the allocated resources rather than the expected variability in the ground conditions. Uncertainties in ground conditions may lead to poor decisions in project planning and active risk management. This paper presents a systematic and rational methodology to identify...
Article
Stratigraphic transitions within the tunnel envelope cause a rapid change in tunnel boring machine (TBM) operating parameters and impose a significant challenge to TBM tunnel projects. This paper presents a geostatistical modeling–based probabilistic approach to quantify the stratigraphic transition location uncertainty in the longitudinal directio...
Article
Full-text available
This research proposes a model for early prediction of collapse incidents in rocks during tunnel boring machine (TBM) operation utilizing TBM and geological survey data. Uncertainties associated with tunnel geology can significantly hamper tunneling progress. So far, various research works have tried to reduce such uncertainties by predicting the g...
Article
Full-text available
Tunneling in karstic geology confronts numerous challenges due to unpredictable occurrence of voids. The current approach of karstic void risk assessment is qualitative or semi-quantitative and lacks consideration of the spatial variability and distribution of voids. This often influences the pricing strategies, and design and construction activiti...
Article
Increasing the speed of drilling operations is of commercial and military interest for transportation infrastructure as well as rapid installation of underground utilities in urban settings and over long distances. A significant challenge to increasing speed in horizontal directional drilling is pressure and flow rate management of drilling fluids...
Article
Shield tunneling is a process that can disturb the geological environment, causing release of soil stress and damage of soil structure. This study uses the shear strain state to assess the shield tunneling-induced soil disturbance degree (SDD) in three typical structured clays, including Ningbo clay, London clay, and Bangkok clay. Three dimensional...
Article
Three dimensional (3D) finite-difference analysis simulations together with rare field data from strain gauges installed in segmental lining rings at the Seattle Sound Transit Northgate Link tunnel project are examined to provide a better understanding of segmental liner loading developed during earth pressure balance shield tunneling. A simplified...
Article
Full-text available
The safety of tunneling with shield tunnel boring machines largely depends on the tunnel face pressure, which is currently decided by human operators empirically. Face pressure control is vulnerable to human misjudgment and human errors can cause severe consequences, especially in difficult ground conditions. From a practical perspective, it is the...
Article
The hydraulic resistance of the filter cake on a tunnel face is an important factor in the stability of slurry-driven shield tunnels. However, the effect of the filter cake is not well understood. The study presented in this paper explores the dynamic and periodic features of the filter cake on the tunnel face through infiltration column tests. A t...
Article
Tunnel Boring Machines (TBMs) are used for tunneling and underground construction, by excavating material and subsequently installing a segmental concrete tunnel liner for support. However, unknown ground conditions pose a significant risk to tunneling operations and any damage to the machine can be disastrous to a project. There is a need for tool...
Article
The proliferation of data collected by modern tunnel boring machines (TBMs) presents a substantial opportunity for the application of machine learning (ML) to support the decision-making process on site with timely and meaningful information. The observational method is now well-established in geotechnical engineering and has a proven potential to...
Article
Earth pressure balance shield tunnel boring machines (EPBM) are widely used in tunneling practice yet the mechanics that define ground-EPBM interaction, specifically the advance rate, are not well understood. In the study presented here, machine learning techniques including feature selection, support vector regression (SVR) and partial dependence...
Article
Proper soil conditioning is critical for effective earth pressure balanced tunnel boring machine (EPBM) operation. Foam as a soil conditioner has been extensively used in EPBM tunneling to modify the excavated soil properties. A critical characteristic of foam-conditioned soil is stability, i.e., the ability to maintain the engineering properties t...
Article
This paper presents a simplified excavation chamber pressure model for earth pressure balance shield tunnel boring machine (EPBM) tunneling in granular soils, capable of predicting chamber pressure response during both excavation and standstill periods. Two physical processes, (1) compressible material flow, and (2) chamber fluid seepage, are model...
Article
Full-text available
The earth pressure balance tunnel boring machine (TBM) is advanced excavation machinery used to efficiently drill through subsurface ground layers while placing precast concrete tunnel segments. They have become prevalent in tunneling projects because of their adaptability, speed, and safety. Optimal usage of these machines requires information and...
Article
This paper addresses the elastic net modeling of earth pressure balance shield machine (EPBM) advance rate for which there is no published physical model. Elastic net polynomial regression is employed to model the advance rate using data collected during the excavation of Sound Transit Northgate Link tunnels (N125) in Seattle, Washington, USA. The...
Article
Ground Penetrating Radar (GPR) is being considered as a potential non-destructive technique for ensuring complete annulus grout backfill behind pre-cast segmental tunnel liners. Current methods for ensuring grout backfill involve drilled verification holes through the waterproof liner. The Rondout bypass tunnel, in Newburgh, NY, where void formatio...
Article
A novel application for outlier detection is in ground deformation monitoring. During any type of underground construction in urban settings, sensors are placed on the ground surface to monitor the vertical displacement with the goal of ensuring that there is no substantial heaving or settling of the ground. As a result, a large spatial-temporal da...
Article
Foam as a soil conditioning agent has been extensively employed in earth pressure balanced (EPB) tunnel boring machines (TBM) to change the mechanical and hydraulic properties of soils for effective excavation. Foam stability is a critical parameter that influences the performance of foam and foam-conditioned soils. This paper examines foam stabili...
Article
A study was performed on the University Link and Northgate Link projects in Seattle, WA, to investigate the use of apparent density evaluation methods for the identification of air pockets and plugging issues in the chamber of EPB TBMs. Both air pockets and plugging issues can result from improper soil conditioning and the TBM’s inability to mix th...
Conference Paper
This paper presents the implementation of an electrical resistivity push probe to estimate the diameter of jet grout columns. The probe is pushed into the jet grout column immediately after mixing and removed such that no damage is done to the column. The probe allows direct coupling of electrodes to the soilcrete, providing a demonstrated improvem...
Conference Paper
The prediction of ground surface settlement resulting from the excavation of shallow tunnels in soft ground is instrumental for determining the required tunnel boring machine support pressures to minimize the impact on nearby infrastructure. Conventional practice uses a deterministic approach to estimate these pressures. However, actual settlements...
Conference Paper
This paper addresses the use of spatially distributed hydraulic head measurements to reduce uncertainty in backward piping erosion (piping) failure assessment. Uncertainty and variability in soil characteristics and limited measurements propagate through failure analysis, leading to highly uncertainty probabilities of failure. This paper uses quali...

Citations

... Therefore, evaluating the settlement hazards induced by tunneling is recommended since they have high significance for the long-and short-term performance of the tunnel. The effects of tunneling on the ground surface have been studied by several researchers [2][3][4]. However, their conclusions have been marred by uncertainty since it is unclear how the various elements affect the tunneling process. ...
... Application and inclusion of probabilistic assessments into the GBR can provide insights into the expected tunnel excavation environment and facilitate improved risk estimation and allocation. In tunneling applications, Grasmick (2019) and Gangrade et al. (2020) employed geostatistical techniques to quantify spatial uncertainties in geotechnical conditions within the tunneling envelope. Grasmick et al. (2020b) used geostatistical simulations to quantify uncertainties and confidence intervals for geotechnical properties relevant to tunneling risks. ...
... Popular optimisation methods include genetic algorithms (GAs) (Mangal et al., 2021) and PSO (H. Yu et al., 2022). We employed a recently developed optimisation algorithm, the forensic-based investigation (FBI) algorithm, which converges more quickly and is more accurate than other optimisation methods (Chou & Nguyen, 2020). ...
... For example, the transient flow in a semiconfined aquifer with elastic storage is considered in Broere's model [10], which would seem to greatly simplify the real situation. Numerical simulations, particularly the finite element method, have been applied increasingly on the prediction of increased pore water pressure in front of the tunnel face [26,49,51]. They brought convenience for understanding the distribution of the EPWP on the macroscale; however, in most cases, the results were not comparable with the field measurements. ...
... Deterministic values of γ and c' values are considered in estimating SAI, primarily due to limited samples to infer any correlations. Grasmick and Mooney (2021) have discussed the minimal impact of considering deterministic values of geotechnical parameters on SAI calculations and specifically, cutter tool wear rate estimates. SAI conditions at each simulation voxel are modeled using the relationship proposed by Köppl (2014) presented in Eq. (8). ...
... Sequential excavation of the crossover cavern took place from 30 May 2018 to 14 March 2019, after which 30 and 46 cm liners of shotcrete and concrete, respectively, were installed. Sequential excavation follows principles of the observational method, requiring a complex monitoring system with extensive instrumentation, including a network of GSSPs and automated total stations capable of making settlement measurements with an accuracy of ±0.7 mm [72]. This monitoring system captured an increase in surface subsidence coincident with the crossover cavern excavation. ...
... Additionally, the weight of EPB, and the properties of the lining are also implemented in the numerical models. By bearing all these factors in mind, high-precision surface settlement and interaction parameters can be determined over twin tunnels in shallow urban areas by simulation in the numerical models, through investigations that have been conducted to simulate EPB excavations and the interaction effect thereof in underground areas [35][36][37][38][39][40][41]. Face pressure and grout pressure are the main effective factors of mechanised excavation in EPB-TBM. ...
... However, clogging has made the SPB shield tunneling unsustainable, due to the overflowing slurry which has caused environmental pollution. As a typical clayey soil, mudstone has a high potential to cause clogging [6,7]. Several projects in China have encountered clogging problems in the mudstone-rich area, for example, the Wuhan Sanyang cross-river road tunnel [8], the metro tunnel line 1 and 2 in Nanning city [9], Nanchang Metro Line 1 [10], and the Nanjing Yangze river tunnel [11]. ...
... At present, the film-forming preparation of naturally weathered red-bed soil mud mainly depends on pressurization conditions, which take a long time to achieve. The film-forming process cannot be carried out in the natural environment and thus cannot be applied to the field of ecological restoration [5,6]. Therefore, it is necessary to study mud films made with naturally weathered red-bed soil, which can form high-quality films under pressureless conditions and can be applied to the field of ecological restoration. ...
... Qian et al. 9 found that the resistivity measurement is able to characterize the grout seepage process, and resistivity measurement is a new way to monitor the grouting process and is helpful for the grouting design. Mifkovic et al. 10 carried out a laboratory study and performed forward modeling to study the feasibility and optimized survey design of direct current resistivity as a lookahead geophysical imaging tool for TBM excavation. Overall, the field resistivity measurement/monitoring is wildly applied in water inrush and other disaster warning in underground engineering owing to its high sensitivity; however, research studies regarding rock damage quantification and stress state monitoring using resistivity measurement are quite rare. ...