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（中煤科工集團(tuán)重慶設(shè)計(jì)研究院有限公司， 重慶 400016）

［摘要］針對(duì)巖基載荷試驗(yàn)獲得的巖石地基承載力特征值遠(yuǎn)高于《建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范》（GB 50007—2011）計(jì)算值的情況，分析了造成偏差較大的原因，提出了解決方法，并結(jié)合工程實(shí)例驗(yàn)證了解決方法的合理性、經(jīng)濟(jì)性和安全性。研究結(jié)果表明，造成巖石地基承載力特征值的巖基載荷試驗(yàn)值大于計(jì)算值的主要原因是地基規(guī)范中計(jì)算式未考慮巖體圍壓效應(yīng)提高系數(shù)，該系數(shù)隨巖石飽和單軸抗壓強(qiáng)度的增大而減小；引入巖體圍壓效應(yīng)提高系數(shù)修正計(jì)算公式，提出重慶地區(qū)軟質(zhì)巖、較軟巖、硬質(zhì)巖的巖體圍壓效應(yīng)提高系數(shù)取值分別為1-5，1-2，1-0；對(duì)于巖層膠結(jié)程度差、取樣困難地層，巖體完整性折減系數(shù)應(yīng)取規(guī)范中的低值；對(duì)于構(gòu)造裂隙發(fā)育、區(qū)域地質(zhì)較破碎地區(qū)，即使定性為較完整地層，巖體完整性折減系數(shù)仍不能取高值。

［關(guān)鍵詞］巖基載荷試驗(yàn)； 地基承載力特征值； 巖體； 圍壓效應(yīng)

中圖分類號(hào)：TU473文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)13-0103-04

Discussion on formula of characteristic value of rock foundation bearing capacity based on rock foundation loading test results

Zhan Kaiyu, Xu Shitong

(Chongqing Design and Research Institute Co., Ltd., China Coal Technology and Engineering Group, 

Chongqing 400016， China)

Abstract:The rock foundation loading test characteristic value based on rock foundation loading test is higher than the calculated values in Code for design of building foundation (GB 50007—2011), and the reason of large deviation was analyzed and solutions were proposed. Combined with the engineering practice, rationality, economy and security of the solution were verified. The research results show that the main reason for a larger rock foundation loading test value than calculated result of rock foundation loading test characteristic value is that calculated formula in code does not consider the improvement coefficients of confining pressure effect in rock, and the improvement coefficient is in inverse proportion to uniaxial compressive strength of rock. And calculation formula of the improvement coefficients of confining pressure effect in rock was introduced and it proposed that improvement coefficients of confining pressure effect of soft rock, slightly soft rock and hard rock in Chongqing are suggested to adopt 1-5, 1-2 and 1-0 respectively. For the rock layer with poor degree of rock formation and the difficulty of sampling, the rock body integrity reduction coefficient should take the lower value in the code. For the region with structural fracture development and the regional fragmented geology, the rock body integrity reduction coefficient still cannot take higher value even if the rock layer is complete.

Keywords:rock foundation loading test; characteristic value of foundation bearing capacity; rock; confining pressure effect

作者簡(jiǎn)介：湛鎧瑜，碩士，工程師，Email: zhankaiyu@163.com。