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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 400042）

［摘要］結(jié)合某超深巖質(zhì)基坑工程實(shí)例（基坑深度最大33.20m），通過(guò)原位大型巖體直剪試驗(yàn)、錨索錨固段應(yīng)力分布試驗(yàn)及錨桿（索）現(xiàn)場(chǎng)拉拔試驗(yàn)，獲得巖土體和錨桿（索）指標(biāo)力學(xué)性能參數(shù)值，作為進(jìn)一步指導(dǎo)基坑支護(hù)設(shè)計(jì)施工的重要依據(jù)。試驗(yàn)結(jié)果表明：錨索錨固段應(yīng)變?cè)谄鹗级俗畲螅S錨固段長(zhǎng)度的增加迅速衰減，呈近雙曲線型分布；錨索預(yù)應(yīng)力損失在鎖定后0～15d內(nèi)偏大，后期趨于平穩(wěn)；錨入穩(wěn)定巖層的錨桿（索）整體蠕變率偏低。最后，通過(guò)數(shù)值模擬和現(xiàn)場(chǎng)監(jiān)測(cè)進(jìn)一步驗(yàn)證了支擋結(jié)構(gòu)體系的有效性。

［關(guān)鍵詞］復(fù)雜環(huán)境；超深巖質(zhì)基坑；直剪試驗(yàn)；錨桿；錨索；應(yīng)力分布；預(yù)應(yīng)力損失

中圖分類號(hào)：TU470文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)03-0132-06

Experimental study on super-deep rock foundation pit under complex environmental condition

HOU Junwei, TANG Qiuyuan, LIU Jiayi

(Chongqing Research Institute of China Coal Technology & Engineering Group Corporation, Chongqing 400042, China)

Abstract:Combined with an example of an super-deep rock foundation pit (the maximum depth of the foundation pit is 33.20m), the values of mechanical parameters were obtained through in-situ large-scale rock mass direct shear test, stress distribution test of anchoring section of anchor cable and anchor rod (cable) pull-out test, which were used as an important basis for further guiding the design and construction of foundation pit support. The test results show that the strain of the anchoring section of the anchor cable is the largest at the initial end, and it decays rapidly with the increase of the length of the anchoring section, presenting a nearly hyperbolic distribution; the prestress loss of the anchor cable is larger in 0～15 days after locking and tends to be stable in the later period; the overall creep rate of anchor rod (cable) anchored into stable rock formations is low. Finally, the effectiveness of the supporting structure system is further verified through numerical simulation and field monitoring.

Keywords:complex environment condition;super-deep rock foundation pit;direct shear test;anchor rod;anchor cable;stress distribution;prestress loss

作者簡(jiǎn)介：侯俊偉，碩士，高級(jí)工程師，注冊(cè)土木工程師（巖土），Email：116338270@qq.com。