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总结
澳大利亚广播公司报道，墨尔本海德堡地区靠近North East Link隧道施工点出现约7.5米天坑，相关掘进与施工被迫暂停，政府与承包方开展勘测并进行安全评估，周边居民及高价住宅的受影响风险受到关注。报道解释，天坑常因地下水侵蚀、土体松动或工程扰动等因素长期累积，地表可能多年无明显征兆，最终在达到临界条件时突然塌陷，因此需要更持续的监测与风险管理。
正文
Sinkholes could be forming for years before a sudden collapse. Here's why Australian Broadcasting Corporation Tunnelling on North East Link paused after 7.5-metre sinkhole appears The Age Heidelberg sinkhole less than 400m from million-dollar homes realestate.com.au Allan govt confirms North East Link machines 'factor' in sinkhole opening Herald Sun A giant sinkhole has opened up in Heidelberg Brisbane Times
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