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目前,省内有座硬壳坝(陂),其中不少存在或多或少的问题,其中又大多与中央干砌石或堆石的压缩沉降有关,新桥水库亦属此类。据我们了解,目前对该类问题采取过的处理方法主要有:灌浆(水泥浆,水泥沙浆等),加厚硬壳,打开硬壳直接冲沙至干砌体。就新桥水库而言,曾提出过的处理方案除上述3个以外,还有一个方案是炸掉旧坝重新建造。从上述方案看:灌浆虽然效果好,但成本高昂,仅材料费就要60万元以上,加厚硬壳成本高,亦不能解决干砌体沉陷问题,冲沙成本低,工艺简单,但控制点面范围有限,又是无压灌注,沙体的扩散有限,不能达到显著增加“干砌体”的密实度的目的的,炸坝重建是不得已的办法。本工程采用的加固方案,是通过一定密度的钻孔贯穿坝体,分段进行灌沙,经实施证明,达到了增加坝重和干砌体密实度的预期目的,取得了良好的灌沙效果。完工后半年未发现新的坝面裂缝或旧裂缝宽度增加的现象。
At present, there are some hard-shell dams (陂) in the province, many of which have more or less problems, most of which are related to the compression and sedimentation of dry masonry or rockfill of the Central Government and also to Xinqiao Reservoir. According to our understanding, the current treatment methods for such problems mainly include grouting (grout, cement mortar, etc.), thickening the hard shell, and opening the hard shell to directly flush the sand to the dry masonry. In the case of Xinqiao Reservoir, one of the proposed treatment options other than the above three is to blow up the old dam and rebuild it. From the above program: Grouting though the effect is good, but the cost is high, only the material cost will be 600,000 yuan or more, thickened hard shell high cost, can not solve the problem of dry masonry subsidence, flushing cost is low, the process is simple, but the control There is a limited range of points and there is pressureless perfusion. The diffusion of sand body is limited and the purpose of significantly increasing the solidity of “dry masonry” can not be achieved. Therefore, the reconstruction of the bomb dam is the last resort. The reinforcement scheme adopted in this project is through a certain density of drilling through the dam body, sub-paragraph irrigation, proven by the implementation, to achieve the intended purpose of increasing the dam weight and dry masonry density, and achieved good irrigation effect . Six months after the completion of construction, no new increase in the width of the dam surface cracks or cracks was found.