铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2014年
10期
21-25
,共5页
K 30水平载荷试验%反力面土体位移%位移修正
K 30水平載荷試驗%反力麵土體位移%位移脩正
K 30수평재하시험%반력면토체위이%위이수정
K30 Horizontal load test%Displacement of reaction force provider%Displacement correction
现场 K 30水平载荷试验是获取地基土水平力学指标最直接有效的手段。手动油泵恒压是保证平板载荷试验结果准确性的重要前提。在市政、地铁等深基坑工程中进行小型对比试验时，由于试验场地限制，往往会用基坑侧壁土体作为试验反力提供面。同一级压力测试下，反力面土体存在一定的压缩变形，导致油压恒定很难做到，从而影响试验结果的精度。为了保证试验准确性，基于恒压问题，从理论公式计算入手，推导出压力变量与反力面土体位移量之间的关联公式，将反力面土体位移引起的压力偏差修正到测试面土体计算位移中，为现场小型载荷试验的结果可信度提供依据。
現場 K 30水平載荷試驗是穫取地基土水平力學指標最直接有效的手段。手動油泵恆壓是保證平闆載荷試驗結果準確性的重要前提。在市政、地鐵等深基坑工程中進行小型對比試驗時，由于試驗場地限製，往往會用基坑側壁土體作為試驗反力提供麵。同一級壓力測試下，反力麵土體存在一定的壓縮變形，導緻油壓恆定很難做到，從而影響試驗結果的精度。為瞭保證試驗準確性，基于恆壓問題，從理論公式計算入手，推導齣壓力變量與反力麵土體位移量之間的關聯公式，將反力麵土體位移引起的壓力偏差脩正到測試麵土體計算位移中，為現場小型載荷試驗的結果可信度提供依據。
현장 K 30수평재하시험시획취지기토수평역학지표최직접유효적수단。수동유빙항압시보증평판재하시험결과준학성적중요전제。재시정、지철등심기갱공정중진행소형대비시험시，유우시험장지한제，왕왕회용기갱측벽토체작위시험반력제공면。동일급압력측시하，반력면토체존재일정적압축변형，도치유압항정흔난주도，종이영향시험결과적정도。위료보증시험준학성，기우항압문제，종이론공식계산입수，추도출압력변량여반력면토체위이량지간적관련공식，장반력면토체위이인기적압력편차수정도측시면토체계산위이중，위현장소형재하시험적결과가신도제공의거。
Site K30 horizontal load test is the most direct and effective means to obtain the horizontal mechanical index of foundation soil. The constant pressure of the manual oil hydraulic pump is an important premise in guaranteeing accuracy of the testing results. In the case of small-scale test for juxtaposing in areas of deep excavation engineering such as municipal and subway, sidewalls' soil of the foundation pit is frequently used as the reaction face provider due to the limitation of testing space. Under the same test pressure level, there is a certain compressive deformation in the reaction face, thus, it is difficult to maintain constant pressure and the accuracy of test result is affected. To ensure test accuracy, this paper derives the formula relating to pressure variable and soil displacement of the reaction face, and the pressure difference caused by the soil displacement is corrected in the calculation of displacement of the test soil, which provides references for the result credibility of small-scale site load test.
