d.blast {plgraphics}

Blasting for a tunnel

Description

Blasting causes tremor in buildings, which can lead to damages. This dataset shows the relation between tremor and distance and charge of blasting.

Usage

data("d.blast")

Format

A data frame with 388 observations on the following 7 variables.

no

Identification of the date and time

date

Date in Date format. (The day and month are correct, the year is a wild guess.)

datetime

Date and time in the format '%d.%m. %H:%M'

device

Number of measuring device, 1 to 4

charge

Charge of blast

distance

Distance between blasting and location of measurement

tremor

Tremor energy (target variable)

location

Code for location of the building, loc1 to loc8

Details

The charge of the blasting should be controled in order to avoid tremors that exceed a threshold. This dataset can be used to establish the suitable rule: For a given distance, how large can charge be in order to avoid exceedance of the threshold?

Source

Basler and Hoffmann AG, Zurich

Examples

data(d.blast)
showd(d.blast)

plyx(tremor~distance, psize=charge, data=d.blast)

rr <-  lm(logst(tremor)~location+log10(distance)+log10(charge), data=d.blast)
plregr(rr)

t.date <- as.POSIXlt(paste("1999",d.blast$datetime,sep="."),
                     format='%Y.%d.%m. %H:%M')