Collapsing roads and retaining walls of newly developed NH stretches in Kerala cause concern among residents

When R. Resmi, a veterinary doctor, acceptable retired connected the day of December 5, she had nary thought that her regular thrust would crook into a terrifying contention for survival. While navigating the acquainted work roadworthy beneath the under-construction National Highway 66 (NH 66) agelong astatine Mylakkadu, adjacent Kottiyam successful Kollam, she experienced a sharp, unexpected jolt.

Her car lurched violently, and earlier she could react, the close broadside of the conveyance changeable upwards. Her contiguous thought was an earthquake.

Then, panic erupted. The operator of an autorickshaw up of her began screaming, hysterically urging her to run. She abandoned her car and sprinted for her life. Looking back, she witnessed a country of implicit chaos.

Surface splits unfastened

The Reinforced Soil (RS) partition of the embankment was disintegrating, spewing ungraded and rubble onto the road. An aged pistillate who had emerged from the car down Resmi was paralysed by fearfulness arsenic the roadworthy aboveground divided unfastened faster than she could move. She was saved by the speedy enactment of residents.

There was besides a schoolhouse autobus trapped among the vehicles. As the roadworthy yawned open, the autobus operator and a unit subordinate frantically evacuated the children. They were instantly joined by section residents, and together, they were seen moving for information carrying the tiny children.

“The partition was connected the right, and determination was a paddy tract connected the left,” recounts Resmi.

Scary situation

“We had nary prime but to sprint crossed the cracking, unstable surface. As we ran, the roadworthy bulged ominously, electrical poles began to buckle and tilt, and h2o started gushing done the caller fissures. It was a precise scary situation,” she says.

There was nary clip to afloat process the catastrophe arsenic the origin became clear—the monolithic Reinforced Soil (RS) partition had failed. Four vehicles, including a schoolhouse bus, were trapped, though nary were injured successful the incident.

“The illness started with a tiny spread successful the RS partition adjacent to the work road, which past rapidly grew into a immense crater. The culvert implicit the watercourse collapsed, and soon, the surrounding land, extending up to the paddy field, cracked unfastened with a thud. This was followed by a large tube burst that flooded the work road. Thankfully, the powerfulness proviso stopped close away. If the elevated partition had wholly collapsed, it would person toppled onto the work road, turning into a large tragedy,” recounts Sreejith S., a resident.

The illness of the nationalist road astatine Kooriyad successful Malappuram earlier serves arsenic a stark precedent to the Mylakkadu incident.

Inadequate foundation

Engineering assessments corroborate that the cardinal flaw successful some the cases is identical. In some Kooriyad and Mylakkadu, the collapses were triggered due to the fact that the underlying instauration was structurally inadequate to carnivore the imposed load.

“It is simply a cardinal engineering rule that an world embankment built connected a anemic instauration volition illness erstwhile the applied value exceeds its capacity. Elevated world embankments mandate rigorous ungraded testing, strengthening measures, and instauration betterment to safely heighten load-bearing capacity. However, these indispensable steps were neglected—neither was the indispensable inspection conducted nor the ungraded strengthened,” criticises Kottiyam Ajithkumar, a subordinate of the Desheeya Patha Samara Samiti, a corporate formed successful protestation against the unscientific construction. The basal supporting the monolithic world embankment astatine Mylakkadu is marshy land, and the authorities conveniently ignored the area’s delicate terrain and precocious groundwater saturation. Failure is inevitable erstwhile the load surpasses the anemic foundation’s bearing limit, helium says.

Senior geotechnical engineering advisor Jayakrishnan Menon confirms that the partition was designed without addressing the debased ungraded spot conditions of the site. “Kerala’s coastal regions diagnostic brushed marine and alluvial deposits, dissimilar different States wherever ample embankments are common. The Mylakkadu capable imposed a load acold exceeding the anemic subsoil’s shear strength,” helium says. He emphasises that inadequate geotechnical probe led to a mediocre knowing of the ungraded profile. In bid to rectify the existent flaw, the failed conception should beryllium removed, and ungraded conditions scientifically re-established earlier reconstruction.

Long-term risks

He adds that solutions similar chromatic columns are imaginable alternatives, but tin beryllium employed lone aft elaborate testing. “Insufficient ungraded reports airs semipermanent risks, arsenic failures tin hap years aft construction. Precise and truthful ungraded information is captious for information successful Kerala’s geologically delicate areas,” helium observes.

As per the institution successful complaint of construction, the ₹1,385-crore task involves upgrading a 31.25 km agelong of NH 66 from an existing two-lane roadworthy to a six-lane dual carriageway highway. This extended improvement program encompasses the operation of a bypass for Kollam city, six flyovers, a obstruction overbridge, 10 underpasses, 7 caller major/minor bridges, and 42 culverts. Achieving this people requires monolithic earthwork, specifically involving much than 2.5 cardinal cubic metres of earthwork and the operation of implicit 1,00,000 quadrate metres of reinforced world wall.

“The operation of the RS partition without considering the topography, climate, oregon the circumstantial characteristics of the ungraded successful each determination is unscientific, and it should beryllium stopped immediately. With the illness of elevated roads built utilizing RS walls successful respective places, it has been unequivocally proven that specified structures are impractical for Kerala’s roads. Pillar-supported elevated highways should beryllium constructed alternatively of relying connected RS walls,” suggests N.K. Premachandran, Kollam MP.

Bearing capableness failure

Following the collapse, the National Highways Authority of India (NHAI) has launched a massive, Statewide geotechnical investigation. As per the preliminary assessments, the nonaccomplishment was owed to a deep-seated shear oregon bearing capableness failure, which means the instauration ungraded was critically anemic and incapable to enactment the imposed load of the partition and world fill.

The NHAI has temporarily suspended the project’s concessionaire and its promoters, M/s Shivalaya, and the Independent Engineer, M/s Feedback -Satra JV, from bidding connected aboriginal projects. It has besides issued show-cause notices to some parties regarding imaginable debarment—up to 3 years for the concessionaire and 2 years for the Independent Engineer—besides the imposition of penalties.

To warrant structural integrity, the NHAI has mobilised 18 geotechnical agencies to behaviour rigorous ungraded sampling and investigating astatine 378 RS partition locations crossed 18 NH 66 task sites successful Kerala, covering sites already built, successful progress, and yet to start.

The Kottiyam Merchants’ Association is readying to motorboat large-scale protests successful the aftermath of the extended harm to inferior lines and the work roadworthy pursuing the collapse. “With much than 35 acquisition institutions and 7 hospitals successful the vicinity, Kottiyam is simply a high-traffic portion wherever implicit 4,000 students commute daily. The existent operation poses a nonstop menace to commuters. The hazardous partition betwixt Mylakkad and Parakkulam should beryllium replaced with a stable, pillar-supported structure," demands S. Palani, wide caput of the association.

Palani points retired that the task has been marred by systemic violations from the outset, specifically partition heights that transcend ineligible information limits. “We had warned the authorities of the impending catastrophe successful the area. Besides petitioning the State and Union governments, we met the officials of Shivalaya Construction Ltd. and explained that the ungraded conditions could not enactment the wall. Our repeated warnings were met with full inaction, and the caller illness is the nonstop effect of that negligence. Public information cannot beryllium compromised, and accountability has to beryllium fixed,” helium adds.

Amballur residents concerned

The Kottiyam mishap has stoked fears among the residents of Amballur successful Thrissur territory implicit the stableness of the mud-filled operation being built for an underpass connected National Highway 544. The underpass is being constructed crossed an extended wetland country wherever ungraded has been filled and raised on a north-south axis for astir 1.2 km. Residents allege that the earthy east-west h2o travel has been obstructed, with nary due outlets provided to drain rainwater from the road oregon run-off from the eastbound side. As a result, determination is terrible water-logging astir the underpass and the overbridge country adjacent aft a abbreviated spell of rain, they complain.

“No due and technological studies were carried retired earlier starting the Amballur underpass work,” says T. Sreenath, an activistic of the Kerala Sasthra Sahithya Parishad (KSSP).

A peculiar gathering of the grama sabha had warned the authorities of the hazard of flash floods if the task was implemented without capable drainage plan. “Amballur is simply a flood-prone area. If dense rainfall occurs, the concern volition worsen arsenic determination are nary channels to fto h2o out,” helium cautions.

Unscientific drainage system

According to residents, the existing drainage strategy on the road is unscientific and incapable to grip aggravated rainfall. The elevated, mound-like operation formed by dumping ample quantities of ungraded has further aggravated the problem, they say.

Water that erstwhile flowed done canals specified arsenic the Keli thodu to the Kurumali stream present has nary wide outlet, arsenic parts of these channels person been converted into roads. Over 60 houses, too commercialized establishments, hotels and a cinema theatre adjacent the Amballur junction, basal successful the affected zone.

A survey radical led by the Nenmanikkara portion of the KSSP recovered that some the h2o flowing from the eastbound broadside done the underpass and the h2o carried by the factual canal connected the occidental broadside of the road is incapable to drain westwards owed to the lack of due channels. The information increases the hazard of wide inundation successful the area.

Highlighting the similarity with the Kottiyam incident, K.K. Aneesh Kumar of the KSSP says the soil-filled operation is apt to go heavy waterlogged, compromising its stability. He demands a broad geotechnical survey and information audit of the Amballur underpass arsenic good arsenic the different underpasses on NH 544 connected the lines of the information assessments carried retired connected NH 66.

Calling for urgent intervention, section residents accidental alternate designs—such arsenic pillar-supported underpasses without extended ungraded filling—should beryllium considered, particularly successful high-value (so that the country nether the underpass tin beryllium utilised) and flood-prone areas, to let earthy h2o travel and trim biology and information risks.

The collapsing roads and retaining walls on the recently developed nationalist road stretches person go shortcuts to accidents successful Kerala.

(With inputs from Mini Muringatheri successful Thrissur)