【作者】 刘莹莹；

【导师】 王建国；

【作者基本信息】 合肥工业大学 ， 工程力学， 2007， 硕士

【摘要】 边坡工程涉及到国民经济建设的各个方面，如露天采矿工程、铁路、公路、水利建设、房屋建筑与市政建设等等，它一方面关系到其所维系的各种构筑物的安全与正常使用，另一方面又影响到构筑物的建设成本。随着人口的急速增长和土地资源的过度开发，边坡问题已成为同地震和火山相并列的全球性三大地质灾害之一。膨胀土是一种吸水膨胀软化、失水收缩开裂的特种粘性土。其主要工程性质是具有裂隙性、超固结性、反复胀缩性。在工程建设中膨胀土作为堤坝的填土材料，可能在堤坝表面产生滑动；膨胀土作为开挖介质，则可能在开挖边坡体时产生滑坡失稳现象。本文在膨胀土边坡已有研究成果的基础上，对降雨强度、降雨持时以及裂隙开裂深度等对膨胀土边坡稳定性影响的参数进行研究，以期得到考虑与不考虑裂隙时边坡渗流场的变化规律。通过两者对比来说明在进行膨胀土边坡稳定性分析时，考虑裂隙影响的必要性。本文以望江路大蜀山段边坡为例，建立分析计算的力学模型，根据现场试验数据，通过数值模拟的方法，进行边坡稳定分析。本文在边坡稳定分析的基础上，虑及施工情况并参考国内外公路工程实践中的一些支护方法，采用了膨胀土路基边坡处理的多种支挡加固措施和防护手段，并对预应力锚索框格梁与土钉锚固进行了考虑膨胀特性规律的设计计算，并以此为依据探讨了预应力锚索合理间距的问题。本研究成果在实际施工中得到了较好的应用，取得了较为可观的经济效益和社会效益。更多还原

【Abstract】 Slope engineering relates to all aspects of national economic construction, such as the open air mining engineering, railroad, highway, water conservancy, construction engineering and civil construction. On one hand it determines the safety and in gear use of all constructions which it supports, on the other hand it influences the cost of the building. With the quick increasing of population and excess exploitation of land resource, slope problem has been one of the three biggest geological disasters and the other two are earthquake and volcano.Expansive soil is a special dauby soil which will intenerate and expand after sopping, but will shrink and craze after losing water. Its main engineering property is cranny, strong concretion and repeat expansive-shrink, ect. In the engineering construction, expansible soil which is used for filling material will glide on the surface of the dyke, which is used for medium during dig will lose property on the digging slope.On the basis of expansive side slope research outcome, the paper makes a parameter study of the expansive soil side slope stability affected by rainfall intensity, craze cracking depth and rainfall duration, hoping to get the change law of side slope penetration field under the condition of considering or no considering the cranny. By comparing with two conditions, the paper illustrates the necessity of considering the infection of cranny when analyzing the expansive soil side slope.Based on a case of slope in Wang-Jiang Road, an analytical mechanical model was developed. According to field testing data, the paper made the slope stability analysis by numerical simulation. Then, on the basis of slope stability analysis, construction condition, and some methods in the internal and external road project, the measures of support and defence are provided. The designs of pre-stressed anchor cable with frame beam and anchored soil-nail are given, which are involved in the expansive engineering property. Based on it, the problem of logical space between prestressed cables had discussed.The study results are properly applied in the construction and some economic benefits and social advantages are obtained.更多还原