Horizontal Stress in Situ by Cone Penetrometer and Related Studies

锥入度仪原位水平应力及相关研究

• 批准号: 8612084
• 负责人: James Mitchell
• 金额: $ 35.15万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-01-01 至 1992-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8612084&HistoricalAwards=false
• 关键词: Horizontal; Stress; Situ; Cone; Penetrometer

This is a cooperative research project between NSF and the Army Research Office (ARO). The major emphasis of this research is to develop a reliable means for the measurement of horizontal stress in the ground using a cone penetrometer. The insitu lateral stress has long been recognized as an important parameter in a wide range of applications in geotechnical engineering. A quantitative value for lateral earth pressure (the ratio of the horizontal to vertical effective stresses) is needed for virtually all stress-deformation and stability analyses; e.g. settlement, bearing capcity, pile capacity, slope stability and design of retaining structures. Safe and economical design of these earth structures and reinforcement systems requires the knowledge of the horizontal stress. The research program develops theoretical analysese of stresses around penetrometers and verifies the results with laboratory chamber tests and field tests using a recently developed lateral stress sensing cone penetrometer (LSSCP). Tests will be done at several sites in the San Francisco bay area where different soil types ranging from soft clays to clean sands are encountered. During the first year of the proposed 3-year program, the lateral stress sensing cone penetrometer testing system will be improved, theoretical analyses related to stress fields around penetrometers and in test chambers will be made, and preparations will be completed for field tests. During the second year, field tests will be done at several sites using several different test devices in addition to the LSSCP. The field and laboratory testing will be completed early in the third year.

这是NSF与陆军研究办公室（ARO）之间的合作研究项目。 这项研究的主要重点是开发一种可靠的手段，用于使用锥形渗透仪在地面测量地面的水平应力。 长期以来，在岩土工程中广泛的应用中，渗透性的侧向应力长期以来一直被认为是重要参数。 几乎所有应力变形和稳定性分析都需要横向土（水平与垂直有效应力之比）的定量值（水平与垂直有效应力之比）。例如 定居，轴承靠背，桩容量，坡度稳定性和保留结构的设计。 这些地球结构和加固系统的安全和经济设计需要了解水平压力。 该研究计划在渗透仪周围开发了理论上的应力分析剂，并使用最近开发的侧向应力锥渗透仪（LSSCP）通过实验室室测试和现场测试来验证结果。 在旧金山湾地区的多个地点将进行测试，在那里遇到不同的土壤类型，从软粘土到干净的沙子。 在拟议的3年计划的第一年中，将改善侧向应力感应锥渗透计测试系统，与渗透测量值周围的应力场和测试室中有关的理论分析，并将在现场测试中完成准备工作。 在第二年，除了LSSCP之外，还将在多个不同的测试设备上在多个站点进行现场测试。 现场和实验室测试将在第三年初完成。