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九寨沟7.0级地震烈度图发布:大部分房屋经受住考验

2017-08-13 15:55:24   今日头条

另外,景区受到的破坏还在发展之中,一个是还在余震,另一个是地震产生了很多松散的物质,如果这段时间有较强降雨,松散物质会形成泥石流,进一步对海子和公路造成破坏。

所以,现在还没有达到开展景区评估和修复的阶段,景区修复还需要比较长的过程。

中国地震局工程力学研究所研究员林均岐:

大部分房屋地震中经受住了考验新闻发布会上,中国地震局工程力学研究所研究员林均岐谈到了目前当地建筑安全问题。

记者问:此次地震烈度不小,但为何建筑整体垮塌的情况很少发生?此外震后老百姓住房是否安全?

林均岐:很少垮塌的原因,要从两方面看:建筑物本身、地震情况。

建筑物本身的话有三句话:

抗震设防水平较高。根据相关规定,九寨沟及周边的设防水平和烈度是8度,是按8度设防进行建筑设计和施工的,设防水平较高;特别是汶川后的房屋严格按这个标准进行,所以抗震性能高;

结构选型合理。看城镇,房屋大部分选用的是钢筋混凝土框架结构,抗震性能好。看农村,多是穿斗木构架房屋的传统民居,在多次地震中表现良好,这次也不例外;

组织管理到位。政府做了很多工作,特别是对村镇房屋的建筑设计、施工、培训、宣传教育各方面都是做了很多工作,取得很好成效。

从地震方面看,震源深度是20千米,比玉树、芦山等地震深度都要深,地震能量从震源出发传播到地面的距离长了,能量衰减大,破坏力就相对小。

至于地震后老百姓关心的住房安全问题,很多人不敢回去住。其实不必担心,这次地震中房屋抗震性能良好,大部分房屋没有在地震中受到破坏,可以正常使用;对呗破坏严重的房屋,这类房屋严禁使用,还禁止靠近和进入,以免带来伤害。还有一种受损了,但是判断不了能否使用,当地政府在对房屋安全性进行鉴定,一栋栋房屋进行,可以根据结论进行判断能否住。

中国地震局地质研究所研究员李志强:自然景观重建修复需有严格流程

新闻发布会上,中国地震局地质研究所研究员李志强介绍了关于村寨重建和自然景观重建的问题。

他介绍,对于村寨重建,九寨沟里面有5个居民区,个别居民区的个别房屋受到破坏较重,大部分房屋是表现好的。按照刚才介绍,政府正在组织安全鉴定,一个个鉴定,会贴上标签,说明能住不能住,再说下一步重建。关于自然景观重建,刚才也说了,破坏还在进一步发生,所以现在要做的是尽量减少防止破坏加大的可能,比如说对诺日朗瀑布,当时一个建议是上面一个静海,放点水,放一厘米的水,水面下降后,可能对诺日朗瀑布减少损失。别的地方也是,比如说有溃坝的危险,做些很小的处理,紧急的处理。但是大部分修复是不应该做的,因为这里是自然遗产,修复要有很严格流程,要先经过评估然后出修复方案,这些评估和修复方案也要等灾害过程停止才能进行。

名词解释:关于地震烈度、地震烈度图与烈度评定所谓地震烈度,反映的是地面及房屋等建构筑物遭受地震影响破坏的程度,包括建筑物破坏、自然景观变化等。我国烈度分为12个等级,等级越高破坏越重。其中六度及以上建筑物将有破坏现象。一般而言,离震中越近,烈度值越大;离震中越远,烈度值会越小。地震烈度图,反映的是一次地震造成的地面影响范围及影响程度。

地震烈度调查与评定是地震事件应对与处置工作的基础和依据。一是为抗震救灾工作部署提供依据;二是为地震灾害经济损失评估奠定基础;三是为灾区恢复重建规划提供科学依据。

责任编辑:任冲 CN062
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