摘要
本文简略介绍了测定岩体变形模量的重要性和各种测试方法,古德曼千斤顶(Goodman Jack)及其主要缺点。笔者针对其缺点作了五项改进,研制出新型的BJ-110钻孔弹模计。标定试验表明,古德曼千斤顶的接触面匹配不良及承压板弯曲导致测量值过小的问题已被新设备克服,压力和位移的分辨率提高了5倍,测定的岩体变形模量不再需要修正。对于岩石,当采用2β=45°的承压块时,测定值与真实值之偏差不大于10％;对于钢、铁等高弹模材料,当采用2β=30°承压块时,其偏差不大于5％。现场试验表明,测定值E_(calc)与岩石常规试验结果完全一致。
Various method of determining the modulus of rockmass as well as Goodman Jack and its main dis-adventages are briefly introduced in this paper. The mismatch between platen and borehole wall as well as the bending of the platen in Goodman Jack have been improved in the new jack. Furthermore the new jack has higher resolution and more accuracy. Calibration tests have shown that the measured modulus Ecalc no longer needs correcting. For the rock block the error of Ecalc compared with Etrue is less than 10% when platen contact angle 2β =45° is chosen. For the blockes of cast steel and iron with higher moduli they are about 5% when the jack is equipped with 2 β =30°platen. Field tests have shown that Ecalc is about the same value as measured by laboratory tests.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
1991年第4期12-23,共12页
Chinese Journal of Geotechnical Engineering
