本文關(guān)鍵詞：覆蓋型巖溶地基注漿處理與效果檢測分析　出處：《建筑結(jié)構(gòu)學(xué)報》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： 覆蓋型巖溶地基 注漿處理 綜合檢驗 效果檢測

【摘要】：覆蓋型巖溶對建筑地基與建筑自身的安全影響較大,結(jié)合某實際工程,分析了地基巖溶的發(fā)育情況以及溶洞和土洞發(fā)育的形態(tài)和規(guī)模;根據(jù)建筑物的基礎(chǔ)形式,采用充填淺部溶洞、裂隙和所有土洞的注漿處理方案,以阻斷巖溶發(fā)育的通道,擠密加固地基土,提高地基承載力。為保證注漿的有效性和經(jīng)濟性,采用由外向內(nèi)的逐層封閉的注漿方法;采用動態(tài)施工技術(shù),根據(jù)檢測孔的測試結(jié)果動態(tài)調(diào)整施工技術(shù)參數(shù)。施工完成后對地基進行了物探、檢查孔、室內(nèi)試驗、平板載荷試驗、標(biāo)準(zhǔn)貫入試驗以及沉降觀測等。結(jié)果表明:對巖溶地基注漿處理的加固效果較為顯著,注漿后地基土強度、密度、變形等指標(biāo)提高幅度為6.4%~25.58%;基于靜載荷試驗和標(biāo)準(zhǔn)貫入試驗結(jié)果分析,地基承載力提高大于10%;與樁基礎(chǔ)方案和大面積深部溶洞處理方法相比,造價節(jié)約20%~30%,工期縮短約1/3。
[Abstract]:The overburden karst has a great influence on the safety of the building foundation and the building itself. Combined with a practical project, the development of karst in foundation and the shape and scale of karst cave and soil cave are analyzed. According to the foundation form of the building, the grouting treatment scheme of filling shallow karst cave, fissure and all soil cave is adopted to block the channel of karst development and strengthen the foundation soil by compaction. In order to ensure the efficiency and economy of grouting, the method of sealing grouting layer by layer from outside to inside is adopted. The dynamic construction technology is used to dynamically adjust the construction technical parameters according to the test results of the test hole. After the completion of the construction, the foundation is tested by geophysical exploration, inspection hole, indoor test and plate load test. The results of standard penetration test and settlement observation show that the reinforcement effect of grouting treatment on karst foundation is more remarkable, and the strength and density of foundation soil after grouting. The improvement range of deformation and other indexes is 6.4and 25.58; Based on the results of static load test and standard penetration test, the bearing capacity of foundation is increased more than 10%. Compared with the pile foundation scheme and the treatment method of large area deep cave, the cost is saved by 20% and the construction period is shortened by about 1 / 3.
【作者單位】： 山東大學(xué)巖土與結(jié)構(gòu)工程研究中心;山東正元建設(shè)工程有限責(zé)任公司;
【基金】：國家自然科學(xué)基金項目(5140833) 山東省自然科學(xué)基金項目(ZR2014EEQ009) 中國礦業(yè)大學(xué)開放基金項目(SKLGDUEK1507)
【分類號】：TU753
【正文快照】： 0引言表1場地地層的物理力學(xué)指標(biāo)Table 1 Physical and mechanical parameters of soil layers土層編號巖土類別w/%ρ/(g·cm-3)ρd/(g·cm-3)e Sr/%ILα1-2/MPa-1Es1-2/MPaφ/(°)c/k Pa(2)粉質(zhì)黏土22.6 1.81 1.48 0.798 77 0.41 0.43 4.28 12.6 30(3)中粗砂23.7 1.93 1.56 0，

本文編號：1420307