MATCH Mechanism-Matched Technical Control

Abstract

The main methodological development introduced in MATCH — Mechanism-Matched Technical Control is the transformation of the former MTK-GW control modes T0–T4 into mechanism-matched technical control states supported by a three-layer qualification structure within the IAS-DX framework. The required control mode is not selected only according to the general intensity of excavation impact. It is selected through a combined procedure that first preserves the sequential engineering qualification logic of MTK-GW 1.0, then incorporates the mechanism-matching logic of MTK-GW 2.0, and finally extends the control state using measurement-based response drivers transferred from SETTLE and OSCAR. At the first level, MATCH retains the original D–L–H–B–R–M–Z screening structure. This level assigns a preliminary technical control mode on the basis of distance and spatial position, location within the influence context, excavation and retaining-system characteristics, building or object characteristics, existing technical condition, monitoring and displacement context, and requalification or special circumstances. The output of this stage is a preliminary control mode Tpre,o, which defines the minimum operational and documentation level for the assessed object. At the second level, the method reorganises the earlier SNO/DMZ logic into the current ORS/DRM terminology. The Object Response Signature ORSₒ(t) combines terrain-side mechanisms transferred from SETTLE with object-side response drivers transferred from OSCAR. It includes components related to differential settlement, slope or angular distortion, curvature, settlement-trough morphology, asymmetry, local anomalies, object–trough intersection, object–trough coupling, dynamic influence, scan-based geometry response and condition change. On this basis, the Dominant Response Mechanism DRMₒ(t) is identified. The selected control mode must therefore observe the mechanism that actually governs the response of the object, for example differential settlement, angular distortion, curvature, local anomaly, object–trough coupling or a coupled mechanism such as Δs + β. At the third level, MATCH introduces control drivers based on measurement evidence. IDYN acts as a dynamic or vibration-related control trigger and may include dominant frequency, vibration velocity, acceleration, duration, event repetition and source relation. ISCAN acts as a geometry-based control trigger and may include three-dimensional displacement, tilt, surface residuals, local deformation concentration, crack development, point-cloud evidence and scan-data quality. For each control mode, MATCH uses COM, MCI and CBS. The Control Observability Matrix COM describes how effectively a given control mode observes each potential response mechanism. The Mechanism-Control Compatibility Index MCI evaluates compatibility between the object response signature and the observability of the selected control mode. The Critical Blind-Spot descriptor CBS identifies whether an active governing mechanism remains insufficiently observed by the selected mode. In this form, MATCH does not merely assign a higher or lower control level. It selects the lowest acceptable mechanism-matched control state that satisfies three conditions: sufficient compatibility with the dominant response mechanism, sufficient observability of the governing driver and absence of a critical blind spot. The final state may be written, for example, as: MATCH-T3(Δs + β) / REL-M meaning increased control targeted at the coupled differential-settlement and angular-distortion mechanism, or as: MATCH-T3(OSCAR-C + IDYN + COT) / REL-M meaning increased control driven by object-side response, dynamic influence and object–trough coupling, or as: MATCH-T4(ISCAN + tilt + crack) / REL-H meaning intensive control targeted at scan-confirmed geometry change, tilt and crack development. The expanded calculation chain may be expressed as: D–L–H–B–R–M–Z → Tpre,o → ORSₒ(t) → DRMₒ(t) → COM(Tᵢ) → MCIₒ,Tᵢ → CBSₒ,Tᵢ → MATCHₒ(t) or, in compact form: MATCHₒ(t) = Tᵢ(DRMₒ(t)) / REL where Tᵢ defines the technical control intensity level, DRMₒ(t) defines the dominant response mechanism that the selected control state must observe, and REL defines the reliability level attached to the control decision. Within IAS-DX, MATCH closes the operational assessment sequence: IAS-DX = DOCC + SETTLE + OSCAR + MATCH References and Methodological Background [1] Florczak, M. (2026). MTK-GW Method: A Sequential Control-Mode Qualification Procedure for Adjacent Structures in the Vicinity of Deep Excavations. Conceptual methodological preprint. [2] Florczak, M. (2026). MTK-GW 2.0: Mechanism-Matched Control for Settlement-Trough Effects Near Deep Excavations. Expanded methodological preprint. [3] Florczak, M. (2026). MATCH-DX 3.0: Mechanism-Matched Technical Control for Deep Excavations. 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