马普托大桥南锚碇工程半成岩力学特性试验研究

发布时间：2018-05-28 13:03

本文选题：岩土工程 + 半成岩　；参考：《岩石力学与工程学报》2017年10期

【摘要】：半成岩是一种半岩半土的特殊工程地质载体,目前针对半成岩力学特性的研究较少。依托马普托大桥南侧锚碇工程,设计可同时进行岩基承载及两相胶结面剪切的现场试验框架,开展基底细砂半成岩载荷试验和混凝土半成岩两相胶结面剪切现场试验,获得细砂半成岩的承载和剪切力学参数,进一步深入研究和讨论半成岩变形模量的预测方法及混凝土半成岩两相胶结面剪切破坏的形态及机制。研究表明细砂半成岩的承载性能与岩石类似,采用基于现场地质条件的经验方法可以较准确地估算半成岩的变形模量;细砂半成岩的混凝土半成岩两相剪切具有独特的性质,其低致密性导致与混凝土形成很强的胶结作用和较明显的胶结带,从而增加了两相胶结面的粗糙程度。在预测混凝土与半成岩两相胶结抗剪强度时,需充分考虑混凝土浸入半成岩的胶结作用。研究结果为大桥锚碇设计提供了可靠的参数支持,为类似地质条件的工程提供可靠依据。
[Abstract]:Half diagenesis is a special engineering geological carrier of half rock and half soil. Based on the south side Anchorage engineering of Maputo Bridge, the field test frame of rock foundation loading and two-phase cementation face shear can be designed simultaneously, and the loading test of subgrade fine sand and the shear field test of concrete semi-diagenetic two-phase cementation surface are carried out. The load-bearing and shear mechanical parameters of semi-diagenesis of fine sand are obtained, and the prediction method of deformation modulus of semi-diagenetic rock and the form and mechanism of shear failure of concrete semi-diagenetic two-phase cementation surface are studied and discussed. The results show that the bearing capacity of fine sand semi-diagenesis is similar to that of rock, and the deformation modulus of semi-diagenetic rock can be estimated more accurately by using the empirical method based on field geological conditions. The two-phase shear of concrete with fine sand and semi-diagenesis has unique properties, and its low compactness results in strong cementation with concrete and obvious cementation zone, thus increasing the roughness of the two-phase cementation surface. In predicting the shear strength of concrete and semi-diagenetic two-phase cementation, the cementation of concrete immersed in semi-diagenesis should be fully considered. The results provide reliable parameter support for bridge Anchorage design and reliable basis for similar geological engineering.
【作者单位】：东南大学土木工程学院;东南大学混凝土及预应力混凝土结构教育部重点实验室;中国路桥工程有限责任公司;
【基金】：国家自然科学青年基金资助项目(41602300) 江苏省青年基金资助项目(BK20150618) 中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1503)~~
【分类号】：U442.2;U443.24

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