Slipping into disaster
Every wet season Indonesia confronts killer landslips. Some could be avoided if NZ research is applied and backed by law. Duncan Graham reports from East Java.
Anyone planning a hurried journey should avoid including a graduate from Dr Laurence Wesley’s (above) class in the car.
They’d drag out the trip and annoy fellow passengers by demanding stops to inspect roadside cuttings. They’re excavation addicts, forever keen to peer beneath the topsoil.
“You can’t understand the science unless you go into the field and get a feel for the situation,” the New Zealand geotechnical engineer tells students in Indonesia.
“Technical results aren’t enough. We all like to play with nice programs and show clients models; but please leave computers in the office and head for the site. Look around at the topography. What’s the soil made of – what’s its geological history? Use your common sense.”
Having dirt under the fingernails is considered proof of professionalism in the West. If he or she is serious (about 20 per cent are women) they’ll have heavy workboots in the trunk along with sample bags and hand tools – even if the car is the family saloon.
But there are constraints in countries which rank status above competence, according to Wesley – and that includes Indonesia. Engineers are respected. First President Soekarno studied civil engineering at the Bandung Institute of Technology, where he obtained an Ingenieur degree.
However for many the title means earning the right to make others do the dirty work.
|Getting a feel for the soil|
Wesley isn’t a foreign academic dumping alien habits onto another culture without understanding the subtleties. The retired University of Auckland lecturer is the author of Mekanika Tanah (Soil Mechanics) first published in 1972 by the Indonesian Public Works Ministry and regularly reprinted.
It’s been the profession’s bible in Indonesia and Malaysia for almost 25 years. Now the octogenarian has written a new Indonesian version which is also being published world-wide in English.
As a young man Wesley wanted to use his degree to do good. He joined the now defunct NZ Volunteer Graduate Scheme arriving in Indonesia in 1960 by boat. The first sight of the country that was to be “an important part of my life from that time through to the present” was the Sunda Strait island Anak Krakatoa. This is the ‘child’ of the volcano which blew apart in 1883.
Here was smoking proof of the power of nature in Java; reports of the explosion were heard 5,000 kilometers away in Central Australia. Thousands died in huge tsunamis.
Geotechnical engineers study the interface of nature and the endeavour of humans to impose their will on the world. How can steel and concrete bond with the soil so the dam doesn’t leak, the high-rise wobble and the highway crumble?
Ghastly accidents reinforce their responsibility. Mistakes can kill. Wesley has been an expert witness when trenches collapse and smother workers. The blame often lies with contractors cutting corners to cut costs.
It’s long known that firm footings make for a safe structure. The Bible has a parable of the wise building on rock and the foolish on sand. It seems obvious. “Not so,” said Wesley. “Sand can be compressed and make a good base; not all rock is stable.”
Great architecture is obvious, but engineers’ triumphs are buried. The public only hears of their work when it goes wrong. Italy’s Leaning Tower of Pisa is a monument to a foundation failure.