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首页> 外文期刊>Journal of Performance of Constructed Facilities >Study of Expansive Soils and Residential Foundations on Expansive Soils in Arizona
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Study of Expansive Soils and Residential Foundations on Expansive Soils in Arizona

机译：亚利桑那州膨胀土和膨胀土上的居住基础研究

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Construction on expansive soils is challenging and thus prone to some problems and litigation. The engineering community makes extensive use of local experience and empirical procedures to address these problems. Although there has been extensive study of expansive soils and foundations on expansive soils, data related to performance of residential structures are limited in general and limited in the Phoenix area, in particular. In this study, an overview of the Phoenix Valley, Arizona, geotechnical practice and foundation performance related to residential structures on expansive clays, was developed through surveys and interviews with geotechnical engineers, structural engineers, and homebuilders. Using data obtained from files of Phoenix area geotechnical firms and government agencies, the existing Natural Resource Conservation Service map showing expansive soil locations throughout the Phoenix region was updated through the use of correlation developed in this study relating expansion index to common soil index properties such as Atterberg limits and percent passing the No. 200 sieve. Files of forensic investigations linked to expansive soil regions were made available for this study by several geotechnical engineering firms, and Phoenix Valley areas where forensic investigations have been identified, were mapped for comparison to regions identified in the updated map as having expansive soils. Comparison of the forensic investigation map to the updated map of expansive clay locations revealed that most of the forensic investigations were in regions identified with clays labeled as high to moderately high expansion potential, with a few forensic investigations in regions of medium expansion potential. Finally, unsaturated flow analyses were conducted for an Arizona expansive clay profile for two very different landscaped conditions of well-irrigated turf and desert landscape. The results of the numerical analyses were consistent with the reported observations and modes of failure identified through the surveys and interviews conducted with engineering and homebuilder professionals, including the finding that site drainage was found to be extremely important to good foundation performance, regardless of the type of landscape selected.
机译：在膨胀土壤上施工具有挑战性，因此容易出现一些问题和诉讼。工程界广泛利用本地经验和经验程序来解决这些问题。尽管已经对膨胀土和膨胀土的基础进行了广泛的研究，但是与住宅结构性能有关的数据通常是有限的，尤其是在凤凰城地区。在这项研究中，通过对岩土工程师，结构工程师和房屋建造者的调查和访谈，对亚利桑那州凤凰谷，与膨胀粘土上的住宅结构有关的岩土工程实践和地基性能进行了概述。使用从菲尼克斯地区岩土公司和政府机构的文件中获得的数据，通过使用本研究中开发的将膨胀指数与常见土壤指数特性相关的相关性，使用现有的自然资源保护服务地图来更新整个凤凰地区的土壤位置。 Atterberg的限制和通过200号筛子的百分比。几家岩土工程公司将与膨胀土区域相关的法医调查文件提供给本研究，并且将已确定法医调查的凤凰谷地区进行了制图，以便与更新地图中标识为具有膨胀土的区域进行比较。法医调查图与膨胀粘土位置的更新图的比较表明，大多数法医调查是在标有高至中等高膨胀潜力的粘土区域中进行的，少数法医调查是在中等膨胀潜力的区域中进行的。最后，针对亚利桑那州膨胀黏土剖面进行了非饱和流动分析，分析了灌溉条件良好的草皮和沙漠景观的两种截然不同的景观条件。数值分析的结果与通过与工程和房屋建筑专业人士进行的调查和访谈所确定的观察到的观察结果和破坏模式一致，包括发现无论哪种类型，场地排水对良好的地基性能都极为重要。选择的景观。

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