不同方法确定砂砾石层承载力的比较研究  

Comparative study on different methods to determine the bearing capacity of sand gravel layer

作　　者：段军邦 谷思宇 张晖[3] 薛会师 DUAN Junbang;GU Siyu;ZHANG Hui;XUE Huishi(Engineering Construction Branch of Huanghe Hydropower Development Co.,Ltd.,Xining 810000,Qinghai,China;School of Geology Engineering and Geometrics,Changan University,Xi'an 710054,Shaanxi,China;Northwest Engineering Corporation Limited,Xi'an 710065,Shaanxi,China)

机构地区：[1]青海黄河上游水电开发有限责任公司工程建设分公司,青海西宁810000 [2]长安大学地质工程与测绘学院,陕西西安710054 [3]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《矿产与地质》2024年第6期1128-1135,共8页Mineral Resources and Geology

摘　　要：砂砾石层由于埋深大、粒径粗、难以取得原状土样等特点,,使得通过室内试验获取其物理力学参数存在较大困难。通常采用原位测试手段来了解砂砾石层的工程特性,进而获得地基的承载力和变形参数等。以茨哈峡水电站左岸吉浪滩上更新统冲洪积砂砾石层为研究对象,分别进行载荷试验、旁压试验、超重型动力触探试验等原位测试试验,并利用不同方法分别计算砂砾石层的承载力进行对比分析。结果表明,载荷试验确定的承载力最小,旁压试验确定的承载力最大,约为载荷试验的1.37倍,其他几种基于超重型动力触探的估算结果均稍高,一般为载荷试验值的1.13~1.21倍,并据此提出不同方法估算承载力的取值建议。Due to the characteristics of buried depth,large grain size,and difficulty in obtaining undisturbed samples of gravel layers,it is challenging to obtain their physical and mechanical parameters through laboratory tests.In situ testing methods are commonly used to understand the engineering properties of gravel layers,thereby obtaining the bearing capacity and deformation parameters of the foundation.Taking the sandy gravel layer of the Jilang Beach in the upper member of the Xingkun Sandstone Formation on the left bank of the Cihaxia Hydropower Station as the research object,in situ tests such as load tests,pressure meter tests,and super heavy dynamic probing tests were conducted.The bearing capacity of the gravel layer was calculated using different methods for comparative analysis.The results indicate that the bearing capacity determined by load tests is the smallest,and the bearing capacity determined by pressure meter tests is the largest,approximately 1.37 times that of the load test.The estimation results based on several other methods using super heavy dynamic probing are slightly higher,generally ranging from 1.13 to 1.21 times the value of the load test,and suggestions for the selection of values for different methods of estimating the bearing capacity are accordingly proposed.

关 键 词：承载力 载荷试验 旁压试验 超重型动力触探 砂砾石层 

分 类 号：TU41[建筑科学—岩土工程] P642.13[建筑科学—土工工程]