Pictures courtesy of Khaosod.

 

Repair work on the massive sinkhole that opened in front of Vajira Hospital on Samsen Road is progressing steadily, according to an update from the Mass Rapid Transit Authority of Thailand (MRTA) on 18 October 2025. The latest phase involves pouring 175 cubic metres of aggregate stone into the affected area following the completion of sand filling, which used around 9,400 cubic metres of material.

 

The sinkhole, which appeared on 24 September, was linked to construction work on the Purple Line metro extension between Tao Poon and Rat Burana (Kanchanaphisek Ring). Since then, MRTA contractors have been working intensively to stabilise the site. Between 14 and 17 October, sand was placed to reinforce the ground and prevent further subsidence. The surface of the sand was about 85 centimetres below the original road level.

 

Workers then cleared debris from the surrounding area for laying a 50-centimetre layer of crushed stone. Once this phase is complete, the road will be resurfaced and access routes to Vajira Hospital will be reopened. The entire stone-pouring process is expected to be completed within two days.

 

In the meantime, furniture and equipment are being moved out of the Sam Sen Police Station building in preparation for its demolition, as part of ongoing safety and redevelopment measures in the area. MRTA engineers continue to monitor nearby structures, including the police station and residential flats, to ensure no further instability.

 

Assessments to date have found no significant structural movement, with MRTA reaffirming that the surrounding area remains safe. The agency stressed its commitment to completing the repairs efficiently while maintaining strict safety standards for residents, workers and hospital visitors.

 

MRTA officials said the repair work aims to restore Samsen Road and its adjacent areas to normal conditions as soon as possible, with the reopening of hospital access considered a top priority.

 

 

Key Takeaways

 

• Laying of sand has been completed to stabilise the sinkhole.

• Crushed stone is being added before resurfacing and reopening the road.

• Inspections confirm no further significant structural movement nearby.

 

Related stories

 

Sand-fill-continues-to-stabilise-expanding-sinkhole

 

Massive-road-collapse-near Vajira-hospital-triggers-evacuation

 

 

  Adapted by Asean Now from Khaosod 2025-10-19

 

 

 

 

Seems like that has gone rather quick.

Bad engineering and bad quality of workmanship  will last 5 min and another sink hole will appear when all this is washed away when it rains and floods, they have no idea !!!  

Sinkhole Repair

A sinkhole is best repaired by excavating to rock and then building an aggregate filter in the hole. https://ei.lehigh.edu/envirosci/enviroissue/sinkholes/images/repair.jpg Step 1: Excavate the sinkhole down to rock if possible. Step 2: Put a layer of large stones in the hole (cabbage size). Step 3: Put a layer of smaller stones on top (fist size). Step 4: Put a layer of gravel on top of the small stones. Step 5: Cover the gravel with a geotextile fabric. This prevents the next layer (sand) from being lost through the gravel. Step 6: Cover the geotextile fabric with a layer of coarse sand. Step 7: Fill the remainder of the hole with soil. This can be layered to match the existing soil profile. Ideally each layer is six inches to two feet thick. When solid rock is encountered near the surface, drop off the bottom layers (that is start with smaller stone size) or use thinner layers. It is important that the bottom layer be larger than the solution channel opening in the bedrock. The objective is to provide an open path for percolating water so that it can't carry away soil and cause another sinkhole. The repair, as described, also provides good filtration of infiltrating water.

UPDATE
Bangkok Road Collapse: Ground Filled, Pedestrian Access Restored