The construction company backfills and reinforces the collapsed road section

　　A huge sinkhole opens in the road at midnight
　　"The tree was fine last night, but when I got up early this morning I suddenly saw it had fallen into the pit, with only the very top of the tree above ground," said Ms. Zhao, a resident of the southern section of Huangshanmudian Road. Between 2 and 3 a.m., she and her neighbors heard a "gudong gudong" noise. They assumed it was road maintenance and did not pay much attention, but when they went out in the morning they found that the entire roadway had collapsed into a pit five or six meters deep and five or six meters wide.
Two staff members from the Chaoyang District Road Maintenance Center said that at first the collapsed area was seen to be about 10 square meters and about 5 meters deep. According to preliminary understanding, the cause of the accident was poor soil quality that had been disturbed. "The main factors are underground construction and the frequent rolling of heavy vehicles above ground." They said the construction company was currently filling the pit with lime-fly ash mixture.
According to resident Ms. Zhang, after the large pit opened in the middle of the road, a crack also appeared at the entrance to her home. In front of the single-story houses on the west side of the road, the reporter saw a crack several meters long and about half a finger wide. Ms. Zhang shook her head and sighed. "Life is not secure at all. I am really afraid that one day both the people and the houses will sink in."
The road has already been repaired four times
　　Several other residents also expressed dissatisfaction with the road conditions. "There are always minor problems, either a bulge today or a small sinkhole tomorrow." According to their indications, the reporter saw at least four repair marks. Just over 10 meters north of the collapsed roadway, part of the residential compound wall was wavy, and a nearby locust tree and a utility pole had also tilted. "If the ground underneath had not been hollowed out, this dangerous situation would not have appeared," said resident Mr. Liu.
The reporter learned that the ongoing initial tunnel lining construction belongs to a heating pipeline project of Beijing Chengjian Huayu Construction Engineering Co., Ltd., which started in the spring of this year. Project manager Long Fei said the direct causes of the road collapse accident were soaking from heavy rainfall on the night of August 31 and water leakage from a tap water pipe in the early hours of September 1. In the long term, however, there were multiple combined factors. "Tunnel excavation certainly disturbs the underground, and other pipelines, including sewage leakage, also have a certain impact." He said the project had not used heavy vehicles in the past two weeks. A collapse occurred on the southern section of Huangshanmudian Road in Chaoyang District, leaving a sinkhole about 5 meters deep and 6 meters wide in the roadway. Fortunately, no casualties were reported. The construction company, Beijing Chengjian Huayu Construction Engineering Co., Ltd., said the direct causes of the accident were soaking from heavy rainfall and a ruptured water supply pipe. By 16:00 yesterday, all road repair work had been completed.