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玩“沙滩埋人”会致命?专家回应:确有隐患

2017-09-06 14:30:43   中国青年网

很多人喜欢在沙滩上玩沙子埋人的游戏,而网上却有传言说,这种“沙滩埋人”的玩法其实很危险,因为沙子一旦进了水,就会把埋在沙子里的人吸住,无法自拔。真有这么危险吗?为此,央视《是真的吗》栏目记者来到秦皇岛北戴河的沙滩来探寻真相。

记者先找到一位女性志愿者来验证。第一位志愿者平躺在沙滩上之后,记者开始铲沙子,把志愿者的身体埋严实。接下来进行第二步浇水,用来模拟海水涨潮时,人躺在沙子中被水浸湿的情景。记者用小水桶浇了十几次,才把志愿者身上的沙子全部浸湿,沙子的覆盖看起来更均匀了。

在身上的沙子被浇水后,志愿者感到似乎每一处血管都被压迫着。那么,志愿者到底能不能脱身呢?

尝试了多次,志愿者都没能从沙子下起身,并且感到越来越没劲。最终在记者拨开部分沙子后,她才得以脱身。这样看来似乎网上的传言的确有道理。不过,会不会是因为这位志愿者是女生,力气小,所以才不能起来呢?

接下来记者又找来一位身材健硕的男性志愿者。很快,第二位志愿者就被沙子盖得严严实实了。然后将身上每一处沙子都均匀的浇上了水。这位身材健硕的志愿者能不能脱身呢?

当志愿者尝试起身时,胸口的沙子出现了明显的裂缝,但是经过几次尝试,他最终都没能起来。经过两次实验,两位志愿者都没能脱身。那么,为什么沙子被浇了水后,埋在下面的人可能会出不来呢?

中国人民大学物理系教授张芃表示,“当沙子没有被水浸湿的时候,沙子之间有空隙,一旦沙子被水浸透,空隙就被水填补了,那么,外面的空气就不可能跑到人体下方,这个时候人主要受到两个力,一个是正上方的沙子的重力,另外一个是从上而下的空气的压力,这是一个非常大的力”。

专家告诉我们,即使部分位置承受了单向下的空气压力,这个力也让人难以反抗。同时,专家还表示,造成这种现象还有一个原因,就是当水进入沙子的空隙后,在表面张力的等复杂因素的作用下,沙子会变得有黏性,比如干沙子很难塑形,但湿沙子就能堆出城堡,这就是湿沙子有黏性的表现。

中国人民大学物理系教授张芃说,“一粒沙子的运动就会带动另外一粒沙子,两个沙子是这样,这沙滩上成千上万粒沙子也都是这样,这就被连成一个整体了,这个时候人要想站起来,需要面对的就不光是自己正上方那一部分沙子的压力,还包括周围这一大片沙子所产生的压力,这很难克服”。

专家还提醒我们,我们用小水桶浇的10桶水,约为一两次海浪能覆盖在人身上的水量,试想如果此时遇上海水涨潮,你会被埋在沙下无法逃离,后果可想而知。有新闻曾报道,在厦门的海滩上就发生过这样惊险的一幕。一男子与女友挖沙自埋,遇海水涨潮被困沙中无法自拔。消防官兵到达现场后,发现被困男子胸部以下位置全部被沙子掩埋,身体因长期浸泡出现微抽搐,大约40分钟后,被困男子才被救出。

在此提醒网民:如果在沙滩玩“沙子埋人”的游戏,不要埋太深,并且一定要远离海水,以免发生危险。 (孝金波 扶倩羽)

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