卵石层与强风化砂岩层地基承载力研究
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摘要
浅层平板载荷试验是一种测定地基承载力特征值的常用手段。以兰州地区某高层建筑不同地层岩性的地基为研究对象,针对天然卵石层和强风化砂岩层进行了浅层平板载荷试验。研究发现:天然卵石地基的地基承载力特征值要高于强风化砂岩层,由于强风化砂岩层遇水极易崩解,尤其在干湿循环作用下,非常容易发生劣化,因此,在进行浅层平板载荷试验的误差分析中,需要考虑排水对强风化砂岩层的影响;强风化砂岩层在试验中主要发生塑性变形,天然卵石层的性质较好,以弹性变形为主。施工过程中,需要对强风化砂岩层地基进行特殊处理,以保证其满足工程设计要求。
In this paper, shallow plate loading test was conducted on natural cobble layer and strong weathered sandstone layer by taking the foundation with different formation lithologies of a tall building in Lanzhou as the research object. The research findings showed that the characteristic value of foundation bearing capacity was higher than that of strong weathered sandstone layer. Because the strong weathered sandstone layer collapsed easily when encountering water and deteriorated especially in the effect of dry-wet cycling, the influence of drainage on strong weathered sandstone layer should be taken into account during error analysis of shallow plate loading test. The plastic deformation mainly occurred in the shallow plate loading test, the natural cobble layer had better property centering on elastic deformation.
In this paper, shallow plate loading test was conducted on natural cobble layer and strong weathered sandstone layer by taking the foundation with different formation lithologies of a tall building in Lanzhou as the research object. The research findings showed that the characteristic value of foundation bearing capacity was higher than that of strong weathered sandstone layer. Because the strong weathered sandstone layer collapsed easily when encountering water and deteriorated especially in the effect of dry-wet cycling, the influence of drainage on strong weathered sandstone layer should be taken into account during error analysis of shallow plate loading test. The plastic deformation mainly occurred in the shallow plate loading test, the natural cobble layer had better property centering on elastic deformation.
引文
[1]何礼彪.工程质量检测中常用地基平板载荷试验应用分析[J].科学技术创新,2018(25):105-106.
[2]武丹丹,杨成斌,王江涛.深层平板载荷试验在某工程中的应用[J].建筑结构,2015,45(1):91-93.
[3]席大成,王沈力,王玮.基于旁压试验计算浅基础地基沉降[J].西部探矿工程,2018,30(10):17-19,22.
[4]中华人民共和国住房和城乡建设部. JGJ 340—2015建筑地基检测技术规范[S].北京:中国建筑工业出版社,2015.
[5]鲁海涛,曹福明,滕文川.兰州城区卵石工程性质试验研究[J].城市道桥与防洪,2017(7):254-258,265.
[6]李正良,沈治宇,盛焕明.斯肯普顿地基极限承载力公式的滑移线理论解析[C]//全国结构工程学术会议,1999.
[7]张常光,曾开华,赵均海.非饱和土临界荷载和太沙基极限承载力解析解[J].同济大学学报(自然科学版),2010,38(12):1736-1740.
[2]武丹丹,杨成斌,王江涛.深层平板载荷试验在某工程中的应用[J].建筑结构,2015,45(1):91-93.
[3]席大成,王沈力,王玮.基于旁压试验计算浅基础地基沉降[J].西部探矿工程,2018,30(10):17-19,22.
[4]中华人民共和国住房和城乡建设部. JGJ 340—2015建筑地基检测技术规范[S].北京:中国建筑工业出版社,2015.
[5]鲁海涛,曹福明,滕文川.兰州城区卵石工程性质试验研究[J].城市道桥与防洪,2017(7):254-258,265.
[6]李正良,沈治宇,盛焕明.斯肯普顿地基极限承载力公式的滑移线理论解析[C]//全国结构工程学术会议,1999.
[7]张常光,曾开华,赵均海.非饱和土临界荷载和太沙基极限承载力解析解[J].同济大学学报(自然科学版),2010,38(12):1736-1740.