884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 南京市市政設(shè)計(jì)研究院有限責(zé)任公司，210008； 2同濟(jì)大學(xué)地下建筑與工程系 上海 200092）

［提要］結(jié)合南京市城北污水處理廠曝氣沉淀池地基及基礎(chǔ)工程設(shè)計(jì)，對(duì)格池閉水載荷試驗(yàn)過(guò)程中樁筏基礎(chǔ)的變形、筏板底土壓力分布、樁頂荷載受力分布及樁與筏板的荷載分擔(dān)測(cè)試方法與結(jié)果進(jìn)行分析和研究，探討了曝氣沉淀池在實(shí)際運(yùn)行工況時(shí)，樁筏基礎(chǔ)與地基共同作用的機(jī)理和變化規(guī)律。試驗(yàn)結(jié)果表明：大面積筏板后澆帶部分筏板在受力轉(zhuǎn)變過(guò)程中，對(duì)樁筏基礎(chǔ)的沉降值影響甚微；在樁徑相同時(shí)，可通過(guò)調(diào)整不同區(qū)域內(nèi)的樁長(zhǎng)來(lái)優(yōu)化樁基承載力的設(shè)計(jì)；兩相鄰格池，當(dāng)一池為卸載（排水），另一池為加載（注水）時(shí)，卸載一側(cè)的樁頂反力會(huì)達(dá)到最大值；扣除水浮力的影響，當(dāng)樁距徑比s/d＝3.8～4.5時(shí)，筏板分擔(dān)荷載平均比值：滿池工況為9.0%，空池工況為113%；樁筏基礎(chǔ)最大沉降量及最大差異沉降量均遠(yuǎn)小于設(shè)計(jì)值和允許值，對(duì)類似工程設(shè)計(jì)取s/d＝5.0～6.0，筏基可承擔(dān)15%～20%的荷載，經(jīng)濟(jì)效益會(huì)非常顯著。

［關(guān)鍵詞］大型格池；樁筏基礎(chǔ)；共同作用；試驗(yàn)測(cè)；分析研究

Insitu Testing and Research of Large Square Pond"s Pilesraft Foundation Under Cooperation of Ground and Structure/Yang Ting 1, Zhou Jian 2, Wang Yi 1, Yan Xuecheng 1（1 Nanjing Municipal Design and Research Institute Co., Ltd., Nanjing 210008, China; 2 Dep. of Geo. Eng., Tongji University, Shanghai 200092, China）

Abstract:Based on the foundation design of the North Nanjing sewerage farm, the pile raft foundation"s transform, the distribution of soil pressure under the raft and pile load are measured during the water loading test. The sharing in upper loading of piles and raft is analyzed, and also the measuring method is discussed. The mechanism and changing disciplinarian of pile raft foundation and ground"s cooperation under real conditions are introduced and discussed. The test results indicate that the raft post casting belt has less influence on the raft"s settlements. Adjusting piles" length when the piles" diameters are all the same can optimize the bearing capacity of pile. Under the condition that one pond is being pouring in and the neighboring pond is being pumping out, the piles" reaction of the neighboring pond can reach the maximum. The sharing percent of raft is about 9% (pond full) and 11.3% (pond empty) under the condition that the ratio s/dof space between piles and pile"s diameter is about 3.8～4.5. The test results indicate that the measured settlement and non-uniform settlement are far below the designed value and the admitted value. The ratio s/d can get 5～6 in the future that the sharing percent of raft will get 15%～20%, which can get remarkable benefit.

Keywords:large scale square pond; pile raft foundation; cooperation; testing and measuring; analysis and research

*江蘇省“333二期工程”基金資助項(xiàng)目(2002058)。