MATCH-DX Mechanism-Matched Technical Control for Deep excavations

The main methodological development introduced in MATCH-DX 3.0 is the transformation of the former MTK-GW control modes T0–T4 into mechanism-matched technical control states supported by a three-level qualification structure. 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 applies the settlement-trough mechanism-matching logic of MTK-GW 2.0, and finally extends the control state using measurement-based response drivers introduced in OSCAR-DX 3.0. At the first level, MATCH-DX 3.0 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 preserves the MTK-GW 2.0 mechanism-matching structure. The Object Settlement-Trough Signature SNOo is defined as a vector composed of normalised mean settlement, differential settlement, angular distortion, trough curvature, object-assigned settlement area, rate of angular distortion and local settlement-trough irregularity. On this basis, the dominant threat mechanism is identified as DMZo. The selected control mode must therefore observe the mechanism that actually governs the settlement-trough response of the object, for example differential settlement, angular distortion, curvature or a coupled mechanism such as Δs + β. At the third level, MATCH-DX 3.0 extends the former settlement-based signature into an expanded Object Response Signature ORS-DX. This signature combines SNOo with measurement-based response drivers from OSCAR-DX 3.0, including IDYN for dynamic vibration response and ISCAN for scan-based geometry response. IDYN introduces vibration-related parameters such as dominant frequency, vibration velocity, acceleration, duration and event repetition. ISCAN introduces scan-based geometry parameters such as three-dimensional displacement, tilt, surface residuals, deformation concentration, crack development and scan-data quality. For each control mode, MATCH-DX 3.0 uses an expanded Control Observability Matrix COM-DX. This matrix describes how effectively a given control mode observes each potential response mechanism, including settlement-trough mechanisms, dynamic response mechanisms and scan-based geometry mechanisms. The Mechanism-Control Compatibility Index MCI-DX evaluates the weighted compatibility between the object response signature and the observability of the selected control mode. The Control Blind-Spot Matrix CBS-DX identifies which active mechanisms remain insufficiently observed by a given mode. In this form, MATCH-DX 3.0 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 no critical blind spot. The final state may be written, for example, as: T₃(Δs + β) meaning increased control targeted at the coupled differential-settlement and angular-distortion mechanism, or as: T₃(Δs + β + IDYN) meaning increased control targeted at differential settlement, angular distortion and dynamic vibration response, or as: T₄(ISCAN + tilt + crack) meaning intensive control targeted at scan-based geometry change, tilt and crack development. The expanded calculation chain may be expressed as: D–L–H–B–R–M–Z → Tpre,o → SNOo → DMZo → ORS-DXo → DRM-DXo → COM-DX → MCI-DX → CBS-DX → MATCH-DXo(t) or, in compact form: MATCH-DXo(t) = Tᵢᴰᴿᴹᵒ⁽ᵗ⁾ where Tᵢ defines the control intensity level, and DRMₒ(t) defines the dominant response mechanism that the selected control state must observe. References Kotlicki, W., Łukasik, S., Godlewski, T., & Bogusz, W. (2020). Ochrona zabudowy w sąsiedztwie głębokich wykopów. Wytyczne. Warszawa: Instytut Techniki Budowlanej. Wysokiński, L., & Kotlicki, W. (2002). 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