唐家山堰塞湖水位高 将清淤和开挖泄流槽
2009-02-19 来源：四川在线-华西都市报
According to a source at the Mianyang City government, silt drainage of the Tangjiashan quake-lake is about to start, which is planned to be implemented in two phases, with an investment of a total of 160 million rmb.
The water level of Tangjiashan Quake Lake has now stabilised at 718 metres, which is lower than it was shortly after the September 24th flood. However the Chengdu Investigation and Design Research Institute of China Hydropower Advisory Group, on the basis of various measurements and tests, urges caution: the lake still post threats to people downstream. Experts underlined that constant heavy rain and aftershock worryingly increased the possibility of mudslide that would cause massive siltation and consequent flooding.
As yet, there is no easy access to this area, and the restoration program recommended in the current feasibility report would be very challenging. In essence, the plan is to excavate deep division channels, leaving 70-80 metre side slopes on 2 banks that consist of silted rock fragments, presenting considerable risk.
In line with the set plan, drainage and clear-up needs to be completed before the flooding season this year, which is a major part of the first phase of the entire project. Deformation inspection, facility installation and construction of levees are required to be finished by the end of 2009.
The estimated total investment of the whole project is approximately 160.41 million, specifically, 52.75 for the first stage and 107.66 for the second.
唐家山堰塞湖目前水位仍高居718米。
“9·24”洪灾后，中国水电顾问集团成都勘测设计研究院受委托，对唐家山堰塞湖一带进行了大量野外勘探、测量、试验等工作，形成结论：唐家山堰塞体整体稳定，但在持续强降雨或强余震等不利工况作用下，两岸边坡特别是堰塞体右岸一些冲沟存在滑坡、崩塌、泥石流等易发山地灾害，若泥石流造成泄流槽较大规模淤堵，有可能产生次生灾害，对下游防洪安全造成严重威胁，并也可能对上游治城灾后重建防洪保安带来影响。
在进场道路未通的情况下，目前制定的“可研报告”推荐的整治方案不确定性因素较多，工程量大，实施难度很高。“可研报告”中按照治城二十年一遇防洪要求，推荐对泄流槽进行大开挖，估计两岸开挖边坡将高达70—80米，且为夹泥碎裂岩，存在安全隐患。
按计划，第一期整治项目包括泄流槽淤塞体的清淤、堰塞体左右山体变形观测和禹里乡治城防洪堤护岸工程。其中，泄流清淤要求在今年主汛期前完成，变形观测设施安装和防洪堤修建要求在2009年底前完成。
整治工程投资估算16041万元，其中：第一期工程投资5275万元，第二期工程投资10766万元。
