Sains Malaysiana 48(10)(2019): 2113–2123

http://dx.doi.org/10.17576/jsm-2019-4810-06

Calibration of Rock Cutting Numerical Model based on Monitoring Data

(Penentukuran Model Berangka bagi Pemotongan Batu berdasarkan Data Pemantauan)

VEDRAN PAVLIC¹, MARIO BACIC²* & MEHO SASA KOVACEVIC²

¹Hidroinzenjering d.o.o., Okucanska 30, 10 000 Zagreb, Croatia

²University of Zagreb, Faculty of Civil Engineering, Kaciceva 26, 10 000 Zagreb, Croatia

Received: 10 April 2019/Accepted: 17 September 2019

ABSTRACT

Prediction of the deformation increment and the final displacement of the rock cutting is a challenging task. Many ambiguities linked with unpredictable nature or rock mass make it difficult to apply the adequate contingency measures. Implementation of common approach, which includes modelling of discontinuity effects with estimated reduction of rock mass strength and modulus of elasticity, usually does not yield satisfactory results. Therefore, a calibration of FEM based numerical model was made by conducting parametric analysis which feeds upon data obtained from extensive on-site monitoring system. A step forward was made in description of numerical parameters of karst discontinuities through consideration of monitoring results, as well as excavation procedures, position, inclination and length of discontinuities and PDC (project design change).

Keywords: Discontinuities; karst; numerical modelling; observational method; rock mass

ABSTRAK

Ramalan kenaikan canggaan dan sesaran akhir pemotongan batu adalah satu tugas yang mencabar. Banyak kesamaran yang dikaitkan dengan sifat yang tidak dapat diramalkan atau jisim batu menyukarkan untuk menggunakan langkah kontingensi yang mencukupi. Pelaksanaan pendekatan biasa yang merangkumi pemodelan kesan ketakselanjaran dengan anggaran pengurangan kekuatan jisim batu dan modulus keanjalan, kebiasaannya tidak memberikan keputusan yang memuaskan. Oleh itu, penentukuran model berangka FEM dibuat dengan menjalankan analisis parametrik yang menggunakan data yang diperoleh daripada sistem pemantauan ekstensif di tapak. Satu penambahbaikan telah dibuat dalam penerangan parameter berangka ketakselanjaran karst dengan mempertimbangkan keputusan pemantauan serta prosedur pengorekan, kedudukan, kecenderungan dan panjang ketakselanjaran dan PDC (perubahan reka bentuk projek).

Kata kunci: Jisim batu; kaedah pemerapan; karst; ketakselanjaran; pemodelan berangka

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*Corresponding author; email: mbacic@grad.hr