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.

这是美国国家科学基金会和陆军的一个合作研究项目 研究办公室（ARO）。 本研究的重点是 开发可靠的水平应力测量方法 在地下使用锥形比重计。 原位侧位 长期以来，应力被认为是 在岩土工程中应用广泛。 一 侧土压力的定量值（ 水平至垂直有效应力）， 几乎所有的应力变形和稳定性分析;例如， 沉降、承载力、桩承载力、边坡稳定、 支护结构设计。 安全经济的设计 这些土结构和加固系统需要 了解水平应力。 该研究计划发展了应力的理论分析， 并与实验室验证结果 室内试验和现场试验，使用最近开发的横向 应力敏感锥形应变计（LSSCP）。 测试将在 在旧金山弗朗西斯科海湾地区的几个地方， 遇到的类型从软粘土到干净的沙子。 在拟议的3年计划的第一年，横向 改进应力敏感圆锥应变仪测试系统， 与周围应力场有关的理论分析 将在测试室中进行测试，并准备 将完成实地测试。 第二年，外地 测试将在几个地点使用几种不同的测试进行， 除了LSSCP之外， 现场和实验室 测试将于第三年年初完成。