水平旋喷拱棚新工艺与载荷试验研究  

New technology and loading tests of horizontal jet grouting arch

作　　者：柳建国[1,2] 张慧东[1,2] 张慧乐[1,2] 赵琰飞[1,2] 钟冬波[1,2] 徐寒[1,2] 刘钟[1,2] 

机构地区：[1]中国京冶工程技术有限公司,北京100088 [2]中冶建筑研究总院有限公司,北京100088

出　　处：《岩土工程学报》2011年第6期921-927,共7页Chinese Journal of Geotechnical Engineering

摘　　要：基于国内水平旋喷技术存在成桩质量差、加固体周围岩土体变形大等问题,以中国京冶工程技术有限公司开发的全方位高压喷射注浆新工法及相应设备为依托,进行了水平旋喷拱棚现场新工艺和载荷试验。新工艺现场施工过程中,孔口止浆器止浆效果良好;养护28 d后隧洞开挖显示,旋喷桩搭接紧密,开挖长度内无搭接裂缝,施工效果良好;清除上覆土层后,可见旋喷桩质地均匀,纵横向搭接良好,桩–桩咬合尺寸约0.2 m;返浆试块的抗压强度约为取芯试块的60%。拱棚结构载荷试验表明,Q–s曲线相对平稳;拱棚结构的破坏主要是由于旋喷桩体搭接处产生裂缝并不断扩展,最终贯通引起的剪切破坏。通过数值模拟与实测值的对比,拱棚结构的竖向位移和水平位移均随荷载的增大而增加,最大位移值均出现在拱顶位置处。Based on the equipment performance and construction problems of horizontal jet grouting technique in China,a new construction method for rotary high pressure horizontal jet grouting and new equipments are developed based on field technology and loading tests by China Jingye Engineering Corporation Limited.In field tests,the seal equipment achieves good results.The excavation shows that jet grouting piles lap joints are close and have no cracks after 28 days＇ maintenance;and the construction effect is good.After cleaning out the overlaying soil,it can be seen that the texture of the jet grouting piles is uniform,the lateral and vertical lap joints are good,and the occlusion size is about 0.2 m.The compressive strength is of returning fluid sample blocks is about 60% of coring blocks.Based on the full scale tests,the Q-s curves are relatively stable.The cracks occur and are constantly extended,resulting in collapse of the jet grouting arch by cracks perforated.Numerical simulations and tests show that vertical and horizontal displacements of the jet grouting arch increase with the increase of load,and the maximum displacements occur at vault.

关 键 词：水平旋喷 拱棚 载荷试验 数值模拟 

分 类 号：TU472[建筑科学—结构工程]