【作者】 王小平；

【导师】 徐卫亚； 路新景； 景来红；

【作者基本信息】 河海大学 ， 防灾减灾工程及防护工程， 2007， 硕士

【摘要】 软岩硬土是一种介于岩石和土之间的过渡型岩土体。世界上不少国家在工程建设中都遇到过这种岩土体及其引起的工程地质问题，这些问题已经引起了国内外一些专家学者的兴趣，成为了岩土工程界近几年来研究的重要课题之一。本文在广泛查阅国内外有关软岩硬土文献的基础上，以西霞院电站厂房软岩硬土地基为研究背景，采用土工试验和岩石试验相结合的方法对西霞院软岩硬土特殊工程性质及变形特征进行研究。针对目前软岩硬土还没有统一完善的试验方法与评价标准，研究过程中设计并开展仿真试验，对其进行摸索和探讨，并对仿真试验进行有限元分析。主要结论如下：1．通过试验方法，对上第三系软岩硬土的物理化学性质、膨胀特征、膨胀性与物性指标之间的关系以及单轴抗压强度等特性进行较为系统详尽的分析，并将上第三系软岩硬土和工程软岩进行对比分析。2．软岩硬土的力学特性研究。针对西霞院电站厂房软岩硬土地基，以现场试验为基础，结合理论计算、室内试验、地层的具体组合和性状、工程经验和类比综合，对其抗剪强度和地基承载力进行测试，并对各种方法得出的软岩硬土力学指标进行分析比较，给出数值模拟计算的参考值。3．不同尺寸的软岩硬土的强度和变形特征存在力学差异。取六种不同直径的试件进行试验，得出试件尺寸与单轴抗压强度之间的关系及围压变化与强度之间的关系。4．设计并开展仿真试验，对软岩硬土的研究方法进行探讨。结合土工试验、岩石试验和现场试验结果，对仿真试验结果的可靠性进行分析。5．仿真试验有限元分析。利用ANSYS的结构分析来模拟仿真试验，对仿真试验预压荷载和中心荷载分级施加、试样尺寸分别进行数值模拟，分析应力和变形的特征，并对有关参数进行敏感性比较分析。本文的研究基于西霞院反调节水库，有明确的工程实践背景，紧密结合实际工程。本文所取得的研究成果，为西霞院反调节水库的设计与施工提供了重要的参考价值，对其它类似工程具有较大的指导意义。更多还原

【Abstract】 The soft rock-hard soil is one kind of intermediate type material which has great transformation in lithology and has the properties of rock and soil. The engineering problems caused by the soft rock-hard soil which some countries meet, arose a lot of experts interests, and is becomed of an important subject in geotechnical engineering world.Taking the aforesaid problems as research background, this paper studies the soft rock-hard soil feature and deformation behavior of XIXIAYUAN Project by soil tests and rock tests. Since there is no full-fledged experimentation and uniform evaluation standard at present, simulation tests is designed and developed. Finite element analysis for simulation is also carried out. Concrete conclution as follows:1．Through testing method, carry out systematic studies on physicochemical properties, expansive characteristic, relations between dilatability and physics index, and uniaxial compressive test as well as contrastive analysis on Neogene soft rock-hard soil and engineering soft rock2．Mechanics characteristic study on soft rock-hard soil. Basing on large locale test and in-site tests, combine theoretical calculation, indoor test and engineering experience to discuss intensity characteristic and carrying capacity of soft rock-hard soil and evaluate each testing method. Discuss the differences among each testing method, focusing on mechanics characteristic to give numerical simulation recommendation.3．Dimension domino offect study on soft rock-hard soil. Carry out domino offect tests on six different dimensions, and educe connection between dimensions and uniaxial compressive intensions. Find out the rule of surround press and intensions.4．Design and develop simulation test to discuss soft rock-hard soil researching methods. Combine some main soil tests and few rock tests and locale tests, Carry out reliability analysis of simulation test and its result.5．Carry out finite element analysis of simulation test and sensibility analysis of correlation parameters. According to ANSYS structure analysis, numerical value simulation is processed on preloading and center load to discuss stress and strain features as well as sensitivity comparison analysis of relevant parameter.The study of this paper is base on Xixiayuan project, with definite engineering background, combined tightly with actual project . The production of this paper provide very important reference value to design and construction of Xixiayuan project.更多还原