摘要
土质心墙坝的水力劈裂问题对土石坝安全的影响已引起工程界的高度重视。本文分析了沥青混凝土心墙发生水力劈裂的机理,提出心墙碾压施工"松塔效应"产生的水平缝和沥青混凝土的低透水性是发生水力劈裂的重要物质条件,而过渡料与心墙相互作用产生的"拱效应"及强大的"水楔"作用是发生水力劈裂的力学条件。通过实例分析证明沥青混凝土防渗心墙与土质心墙一样也存在水力劈裂的风险,需引起水利界的高度重视,对于高沥青混凝土心墙坝应审慎研究并评价心墙的防渗安全可靠性。分析结果对沥青混凝土心墙坝的设计与施工有一定参考意义。
The influence of hydraulic fracturing problem of soil core wall dam on the safety of embankment dam has been paid great attention in engineering field.This paper analyzed the mechanism that hydraulic fracturing occurs in asphalt concrete core wall,and proposed that the horizontal seam produced in construction of compacted core wall's caused by 'pine cone effect'and the low permeability of asphalt concrete are the important material conditions of hydraulic fracturing,while the'arch effect'and powerful 'water wedge effect'produced by transition material and core wall interactions are the hydraulic fracture mechanics conditions.The analysis of examples proved that the soil core wall and the asphalt concrete core wall all exist the risk of hydraulic fracturing,which need to pay close attention in the field of water conservancy sector.It noted that high asphalt concrete core wall dam should be carefully studied and the core wall's impervious safety and reliability be evaluated.The result has a certain reference value for the design and construction of asphalt concrete core wall dam.
出处
《水资源与水工程学报》
2014年第5期46-50,共5页
Journal of Water Resources and Water Engineering
基金
新疆水利水电重点学科基金(XJXZ-2003-16)
关键词
沥青混凝土心墙
水力劈裂机理
应力应变分析
asphalt concrete core wall
hydraulic fracturing mechanism
stress and strain analysis
