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土工布复合锚杆是一种可应用于松散地层锚固工程的新型锚锭结构。以某滑坡治理工程为平台,开展了拉力型土工布加筋复合锚杆锚固体与破碎岩土体界面间应力传递规律的实测研究。现场试验结果表明,土工布的加筋鼓胀作用调整了锚固体与破碎岩土体接触界面的应力分布,土工布加筋复合锚杆锚固段近端存在稍长的应力协调缓冲段,随着荷载增大,黏结应力峰值向锚固段深部转移的现象不明显;实测破碎岩土体中拉力型土工布加筋复合锚杆主要抗力区域分布在3.0~13.0 m之间,即有效锚固体长度以不超过15 m为宜,过长的锚固长度对提高锚杆抗拔力意义不大;在松散破碎岩土体中应用土工布加筋复合锚杆技术能起到提高锚固力与节约成本的双重作用。
Geotextile composite anchor is a new type of anchor structure that can be applied to loose ground anchoring projects. Taking a landslide control project as a platform, a stress field investigation of the stress transfer between the anchoring body of the composite rock bolting reinforced anchors and the fractured rock mass is carried out. Field test results show that the geosynthetic reinforced bulking effect adjusts the stress distribution at the contact interface between the anchoring body and the crushed rock mass, the slightly longer stress-coordinated buffer zone at the proximal end of the anchoring section of the geotextile-reinforced composite rock bolt, And the peak of bond stress is not obvious to the deep part of anchorage section. The main resistance region of tensile composite geotextile-reinforced composite anchor in fractured rock mass is distributed between 3.0 ~ 13.0 m, that is, the length of effective anchor is not Exceed 15 m is appropriate, too long anchorage length has little effect on improving the pull-out resistance of the anchor. The application of geotextile-reinforced composite anchor in loose broken rock and soil can play a dual role in improving the anchorage force and saving the cost .