Download Geoteknik - 001- Sifat Fisik Dan Mekanik Batuan PDF

TitleGeoteknik - 001- Sifat Fisik Dan Mekanik Batuan
File Size5.7 MB
Total Pages38
Document Text Contents
Page 20

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Pengaruh Kekar Pada Peledakan

A

Orientasi bidang diskontinuitas ke arah pit :

- Ketidakmantapan lereng

- Backbreak berlebih

Orientasi bidang diskontinuitas ke arah

massa batuan :

- Toe tidak hancur

- Potensi batuan menggantung

B

Orientasi bidang diskontinuitas sejajar

bidang bebas :

- Lereng mantap

- Arah lemparan terkontrol

Orientasi bidang diskontinuitas menyudut

terhadap bidang bebas :

- Muka jenjang berblok-blok

- Hancuran berlebihC
D

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38

6. Joint Water Reduction Factor

Approx water pressure Jw

(kg/cm2)

A. Dry excavations or minor inflow, i.e., 5 litre/min locally 1.0 < 1

B. Medium inflow or pressure occasional outwash of joint fillings 0.66 1.0-2.5

C. Large inflow or high pressure in competent rock with unfilled joints 0.5 2.5-10.0

D. Large inflow or high pressure, considerable outwash of joint fillings 0.33 2.5-10.0

E. Exceptionally high inflow or water pressure at blasting, decaying with time 0.2-0.1 > 10.0

F. Exceptionally high inflow or water pressure continuing w/o noticeable decay0. 1-0.05 > 10.0



Note :

(i) Factors C-F are crude estimates. Increase Jw if drainage measures are installed.

(ii) Special problems caused by ice formation are not considered.

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a After Barton et.al (1974)

b Nominal

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