本發(fa)明涉及基坑(keng)工程,具體涉及一種基于臨界水力坡度的(de)多層土體中止(zhi)水帷幕易漏(lou)點判(pan)定方法。
背景技術:
1、隨著(zhu)城市建設(she)(she)與地(di)(di)(di)下(xia)(xia)(xia)空間的(de)(de)快速發展,越(yue)(yue)來越(yue)(yue)多“深(shen)、大(da)(da)、難”的(de)(de)基(ji)坑(keng)(keng)工(gong)(gong)程也隨之出(chu)現,地(di)(di)(di)下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)滲(shen)(shen)(shen)流是基(ji)坑(keng)(keng)工(gong)(gong)程面臨(lin)的(de)(de)重要安全問題之一,工(gong)(gong)程中常用止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)阻隔基(ji)坑(keng)(keng)周圍地(di)(di)(di)下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)的(de)(de)滲(shen)(shen)(shen)流,以保證基(ji)坑(keng)(keng)工(gong)(gong)程的(de)(de)安全穩(wen)定(ding)。然(ran)而,基(ji)坑(keng)(keng)工(gong)(gong)程涉及(ji)的(de)(de)土(tu)(tu)層(ceng)(ceng)(ceng)種類較(jiao)多,土(tu)(tu)體(ti)類型(xing)復雜,且止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)在(zai)(zai)地(di)(di)(di)下(xia)(xia)(xia)土(tu)(tu)體(ti)內部(bu)深(shen)層(ceng)(ceng)(ceng)位置進(jin)行施(shi)工(gong)(gong),受工(gong)(gong)藝及(ji)技術等原因的(de)(de)限制,止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)易(yi)在(zai)(zai)地(di)(di)(di)下(xia)(xia)(xia)多層(ceng)(ceng)(ceng)土(tu)(tu)體(ti)中出(chu)現滲(shen)(shen)(shen)漏(lou)風險。水(shui)(shui)(shui)(shui)力(li)坡度(du)(du)是單位長度(du)(du)內水(shui)(shui)(shui)(shui)位變化(hua)與距離的(de)(de)比值,可反映地(di)(di)(di)下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)滲(shen)(shen)(shen)流時(shi)為克服摩擦(ca)力(li)而使(shi)水(shui)(shui)(shui)(shui)流流動時(shi)的(de)(de)相對(dui)驅動力(li)大(da)(da)小,它決定(ding)了地(di)(di)(di)下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)滲(shen)(shen)(shen)流的(de)(de)流速與方(fang)向,當止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)周圍的(de)(de)水(shui)(shui)(shui)(shui)力(li)坡度(du)(du)越(yue)(yue)大(da)(da)時(shi),地(di)(di)(di)下(xia)(xia)(xia)水(shui)(shui)(shui)(shui)滲(shen)(shen)(shen)流的(de)(de)驅動力(li)越(yue)(yue)大(da)(da),止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)受到水(shui)(shui)(shui)(shui)流的(de)(de)壓力(li)也越(yue)(yue)大(da)(da),導(dao)致止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)滲(shen)(shen)(shen)漏(lou)破壞的(de)(de)風險也越(yue)(yue)大(da)(da)。因此,基(ji)于臨(lin)界水(shui)(shui)(shui)(shui)力(li)坡度(du)(du)的(de)(de)多層(ceng)(ceng)(ceng)土(tu)(tu)體(ti)中止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)易(yi)漏(lou)點判(pan)定(ding)在(zai)(zai)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)帷(wei)(wei)(wei)幕(mu)(mu)(mu)的(de)(de)設(she)(she)計施(shi)工(gong)(gong)過程中尤(you)為重要,對(dui)基(ji)坑(keng)(keng)工(gong)(gong)程的(de)(de)安全穩(wen)定(ding)也有(you)重要意義。
技術實現思路
1、對于(yu)(yu)現(xian)有技術中(zhong)(zhong)存在(zai)的(de)(de)(de)(de)上述問(wen)題,本(ben)發明(ming)提供了一種(zhong)基于(yu)(yu)臨界(jie)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du)的(de)(de)(de)(de)多(duo)層(ceng)土(tu)(tu)體(ti)(ti)(ti)(ti)中(zhong)(zhong)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)易漏點(dian)判定(ding)方(fang)(fang)法(fa)(fa)。該方(fang)(fang)法(fa)(fa)為(wei)減少土(tu)(tu)體(ti)(ti)(ti)(ti)不(bu)(bu)(bu)規則(ze)帶來的(de)(de)(de)(de)偶然性,該方(fang)(fang)法(fa)(fa)首先依據(ju)土(tu)(tu)體(ti)(ti)(ti)(ti)理(li)化(hua)(hua)(hua)性質及(ji)(ji)地下(xia)水(shui)(shui)(shui)(shui)(shui)分布情(qing)況,對基坑(keng)工(gong)(gong)(gong)程影(ying)響范圍內的(de)(de)(de)(de)土(tu)(tu)體(ti)(ti)(ti)(ti)進行分層(ceng),并采用(yong)加權平均法(fa)(fa)計算分層(ceng)后(hou)(hou)的(de)(de)(de)(de)質量(liang)密度(du)(du)(du)、天然含水(shui)(shui)(shui)(shui)(shui)率(lv)、孔隙比(bi)、滲(shen)透(tou)系數(shu)等土(tu)(tu)體(ti)(ti)(ti)(ti)參(can)(can)數(shu)。以分層(ceng)后(hou)(hou)的(de)(de)(de)(de)土(tu)(tu)體(ti)(ti)(ti)(ti)參(can)(can)數(shu)為(wei)依據(ju),采用(yong)geo-studio軟件中(zhong)(zhong)的(de)(de)(de)(de)seep/w(地下(xia)水(shui)(shui)(shui)(shui)(shui)滲(shen)流分析)模(mo)(mo)塊,根據(ju)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)在(zai)多(duo)層(ceng)土(tu)(tu)體(ti)(ti)(ti)(ti)中(zhong)(zhong)所處(chu)不(bu)(bu)(bu)同(tong)土(tu)(tu)層(ceng)類型,建(jian)立(li)(li)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)不(bu)(bu)(bu)同(tong)漏點(dian)位(wei)(wei)置(zhi)的(de)(de)(de)(de)有限元模(mo)(mo)型,模(mo)(mo)擬(ni)工(gong)(gong)(gong)程中(zhong)(zhong)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)在(zai)不(bu)(bu)(bu)同(tong)位(wei)(wei)置(zhi)發生(sheng)的(de)(de)(de)(de)滲(shen)漏,并分析止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)前后(hou)(hou)位(wei)(wei)置(zhi)處(chu)的(de)(de)(de)(de)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du)變(bian)(bian)化(hua)(hua)(hua)。在(zai)建(jian)立(li)(li)模(mo)(mo)型時,將左右兩(liang)側設(she)置(zhi)為(wei)定(ding)水(shui)(shui)(shui)(shui)(shui)頭邊(bian)(bian)界(jie),底部設(she)置(zhi)為(wei)不(bu)(bu)(bu)透(tou)水(shui)(shui)(shui)(shui)(shui)邊(bian)(bian)界(jie),對止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)未做任何材(cai)料屬性的(de)(de)(de)(de)定(ding)義,將其(qi)簡(jian)化(hua)(hua)(hua)為(wei)不(bu)(bu)(bu)透(tou)水(shui)(shui)(shui)(shui)(shui)邊(bian)(bian)界(jie)。采用(yong)太沙(sha)(sha)基公式(shi)與(yu)扎馬(ma)林公式(shi)分別計算臨界(jie)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du),通過與(yu)有限元模(mo)(mo)型進行對比(bi),確定(ding)太沙(sha)(sha)基公式(shi)為(wei)本(ben)工(gong)(gong)(gong)程臨界(jie)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du)適用(yong)公式(shi),臨界(jie)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du)為(wei)0.352。通過分析不(bu)(bu)(bu)同(tong)漏點(dian)位(wei)(wei)置(zhi)時止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)前后(hou)(hou)位(wei)(wei)置(zhi)處(chu)的(de)(de)(de)(de)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du)變(bian)(bian)化(hua)(hua)(hua),擬(ni)合(he)多(duo)層(ceng)土(tu)(tu)體(ti)(ti)(ti)(ti)中(zhong)(zhong)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)發生(sheng)滲(shen)漏時的(de)(de)(de)(de)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du)變(bian)(bian)化(hua)(hua)(hua)曲(qu)線,利用(yong)擬(ni)合(he)曲(qu)線中(zhong)(zhong)水(shui)(shui)(shui)(shui)(shui)力(li)坡(po)(po)度(du)(du)(du)的(de)(de)(de)(de)峰值及(ji)(ji)其(qi)對應深度(du)(du)(du),確定(ding)多(duo)層(ceng)土(tu)(tu)體(ti)(ti)(ti)(ti)中(zhong)(zhong)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)易漏點(dian)。本(ben)發明(ming)方(fang)(fang)法(fa)(fa)新(xin)穎,緊(jin)貼(tie)工(gong)(gong)(gong)程實際,對基坑(keng)工(gong)(gong)(gong)程的(de)(de)(de)(de)滲(shen)漏預防(fang)與(yu)治(zhi)理(li)有很大應用(yong)價(jia)值,適用(yong)于(yu)(yu)基坑(keng)工(gong)(gong)(gong)程多(duo)層(ceng)土(tu)(tu)體(ti)(ti)(ti)(ti)中(zhong)(zhong)止(zhi)(zhi)(zhi)水(shui)(shui)(shui)(shui)(shui)帷(wei)幕(mu)(mu)(mu)易漏點(dian)判定(ding)問(wen)題,對類似工(gong)(gong)(gong)程設(she)計和施(shi)工(gong)(gong)(gong)方(fang)(fang)案的(de)(de)(de)(de)選擇有指導性意義。
2、為(wei)了(le)達到上述目的,本發明(ming)采用如下技術方(fang)案:
3、一(yi)種基于臨界水力坡(po)度的(de)多層土體中(zhong)止水帷幕易漏點(dian)判定(ding)方法,包括(kuo)如下步驟:
4、第一(yi)步(bu),依據土(tu)體(ti)理化(hua)性(xing)質與地下(xia)水分(fen)布情況(kuang),對基坑工程影響范圍內(nei)的的土(tu)體(ti)進行分(fen)層;
5、土體理化性質包括但不限于(yu)各土層的質量密度、天然(ran)含水率、孔隙(xi)比、滲透系數;
6、第二步,采用加(jia)權平(ping)均(jun)法計算(suan)分層(ceng)后的質量密(mi)度、天(tian)然含水率、孔(kong)隙比、滲透(tou)系數等(deng)土層(ceng)理化性(xing)質參數;
7、第三(san)步,選取基坑工程中(zhong)最復(fu)雜剖(pou)面為研(yan)究(jiu)對象并確定研(yan)究(jiu)區域;
8、第四(si)步(bu),根(gen)據止水帷幕在多(duo)層土體中(zhong)(zhong)所處(chu)不同(tong)土層類型,采用geo-studio軟件中(zhong)(zhong)的seep/w即(ji)地下水滲(shen)流分(fen)析模塊,通過輸入體積(ji)含水量函(han)數、水力傳導率函(han)數,并進一步(bu)設置邊界條件與(yu)劃分(fen)單元網格(ge),建立止水帷幕不同(tong)漏(lou)點(dian)位置的有(you)限元模型,確定不同(tong)漏(lou)點(dian)位置時止水帷幕前后位置處(chu)的水力坡度;
9、所述體積(ji)含(han)水(shui)量(liang)函數(shu)選擇體積(ji)含(han)水(shui)量(liang)數(shu)據點函數(shu),分別(bie)輸入土(tu)體類型與飽(bao)和含(han)水(shui)量(liang);
10、所述水力傳導率函數(shu)選擇滲透系數(shu)數(shu)據(ju)點函數(shu),數(shu)據(ju)點函數(shu)的生成(cheng)方(fang)法選擇fredlund-xing-huang法;
11、所(suo)述設(she)(she)置邊(bian)(bian)界條件是指,將(jiang)模型左右兩側均設(she)(she)置為定水(shui)(shui)(shui)頭邊(bian)(bian)界,將(jiang)模型底部(bu)設(she)(she)置為不(bu)透水(shui)(shui)(shui)邊(bian)(bian)界;未對(dui)止水(shui)(shui)(shui)帷幕設(she)(she)定任何材料參數,而是將(jiang)其簡化為不(bu)透水(shui)(shui)(shui)邊(bian)(bian)界;
12、所述(shu)止水帷(wei)幕不(bu)同漏點位置是(shi)指,依據(ju)土(tu)體分層(ceng)結果及(ji)止水帷(wei)幕在多層(ceng)土(tu)體中所涉(she)及(ji)的不(bu)同土(tu)層(ceng)種類;
13、第(di)五步(bu),采用(yong)太沙基公式(shi)與扎馬林公式(shi)分(fen)別(bie)計算止(zhi)水帷幕(mu)臨(lin)(lin)界(jie)水力坡(po)度,采用(yong)有(you)限元(yuan)模型(xing)模擬分(fen)析止(zhi)水帷幕(mu)的(de)水力坡(po)度,將(jiang)有(you)限元(yuan)模型(xing)的(de)模擬結果與公式(shi)計算結果進行對比(bi),以此確(que)定本工程(cheng)的(de)臨(lin)(lin)界(jie)水力坡(po)度適用(yong)公式(shi)與臨(lin)(lin)界(jie)水力坡(po)度取(qu)值;
14、第六(liu)步,根據有限元模(mo)型模(mo)擬(ni)結果(guo),分析止水(shui)(shui)(shui)帷(wei)幕(mu)(mu)前后位(wei)置處水(shui)(shui)(shui)力(li)坡度(du)隨(sui)深度(du)的變化,找出(chu)不(bu)同漏點位(wei)置時的最大(da)水(shui)(shui)(shui)力(li)坡度(du)與對應深度(du);利用origin擬(ni)合(he)繪圖軟(ruan)件,對不(bu)同漏點位(wei)置時的最大(da)水(shui)(shui)(shui)力(li)坡度(du)進行數據擬(ni)合(he),進一步擬(ni)合(he)出(chu)止水(shui)(shui)(shui)帷(wei)幕(mu)(mu)在(zai)其他(ta)位(wei)置發(fa)生滲漏時的水(shui)(shui)(shui)力(li)坡度(du)變化曲線,找出(chu)該(gai)擬(ni)合(he)曲線的峰(feng)值及對應深度(du),該(gai)峰(feng)值即(ji)為多(duo)層土體(ti)中止水(shui)(shui)(shui)帷(wei)幕(mu)(mu)的最大(da)水(shui)(shui)(shui)力(li)坡度(du),對應深度(du)即(ji)為多(duo)層土體(ti)中止水(shui)(shui)(shui)帷(wei)幕(mu)(mu)的易漏點;
15、第(di)七步,在找到止(zhi)水帷幕(mu)易漏點的基(ji)礎上,進(jin)一步通過公(gong)式計算基(ji)坑滲漏流量。
16、作為(wei)優選(xuan)的(de)技術方(fang)案,第二步中,加權平(ping)均法的(de)公式為(wei):;式中:為(wei)計算后所(suo)得等效參數(shu);為(wei)等效土層的(de)個數(shu);為(wei)第個土層的(de)計算參數(shu);為(wei)第個土層的(de)計算權重(zhong)。
17、作為(wei)優(you)選的(de)技(ji)術方案,加權平均法公式中(zhong)的(de)為(wei)各(ge)土層厚(hou)度(du)。
18、作為(wei)優(you)選(xuan)的(de)(de)(de)技術方案,第三(san)步中,所(suo)述的(de)(de)(de)研究(jiu)對(dui)象選(xuan)取基(ji)坑(keng)工程(cheng)中開挖(wa)(wa)(wa)寬度最(zui)大、開挖(wa)(wa)(wa)面最(zui)復雜的(de)(de)(de)剖(pou)面為(wei)研究(jiu)對(dui)象;所(suo)述的(de)(de)(de)研究(jiu)區(qu)域為(wei)以所(suo)選(xuan)剖(pou)面的(de)(de)(de)兩(liang)側邊坡坡頂為(wei)起始點,左右兩(liang)側各延長一(yi)倍(bei)基(ji)坑(keng)開挖(wa)(wa)(wa)深(shen)度,研究(jiu)區(qu)域深(shen)度選(xuan)取兩(liang)倍(bei)基(ji)坑(keng)開挖(wa)(wa)(wa)深(shen)度。
19、作為(wei)(wei)優選的(de)(de)技術方案,第四步中,所述的(de)(de)止水帷幕(mu)為(wei)(wei)三軸(zhou)攪拌樁止水帷幕(mu)、高壓(ya)旋噴樁或地下連續墻中的(de)(de)一種。
20、作(zuo)為優選(xuan)的技(ji)術方案,第四步中(zhong),土(tu)(tu)體(ti)(ti)飽和含水量(liang)可由天然(ran)含水率、土(tu)(tu)體(ti)(ti)相對密度及孔(kong)隙比計(ji)算得出(chu),計(ji)算公(gong)式(shi)為:;式(shi)中(zhong),為土(tu)(tu)體(ti)(ti)飽和含水量(liang),為天然(ran)含水率,為相對密度,為土(tu)(tu)體(ti)(ti)孔(kong)隙比。
21、作為優選(xuan)的技術(shu)方案,第五步(bu)中,所述的臨界水力坡度太沙基公式為:,式中,為土體(ti)臨界水力坡度,為土體(ti)顆粒質量密度,為土體(ti)孔(kong)隙率(lv)。
22、作為(wei)優選的(de)技術方案,第五(wu)步(bu)中(zhong),所述的(de)臨界水力(li)坡度(du)扎(zha)馬林(lin)(lin)公式(shi)(shi)(shi)為(wei):,式(shi)(shi)(shi)中(zhong),為(wei)土(tu)(tu)體臨界水力(li)坡度(du),為(wei)土(tu)(tu)體顆粒(li)質量(liang)密(mi)度(du),為(wei)土(tu)(tu)體孔隙率,扎(zha)馬林(lin)(lin)公式(shi)(shi)(shi)為(wei)太沙基(ji)公式(shi)(shi)(shi)的(de)修正(zheng)形式(shi)(shi)(shi)。
23、作(zuo)為(wei)(wei)(wei)優(you)選的(de)技術方(fang)案,第七步中(zhong),所(suo)述的(de)基(ji)坑(keng)滲漏流量(liang)所(suo)選公式為(wei)(wei)(wei):,式中(zhong),為(wei)(wei)(wei)基(ji)坑(keng)出水(shui)量(liang);為(wei)(wei)(wei)單(dan)井出水(shui)量(liang);為(wei)(wei)(wei)滲透系數(shu);為(wei)(wei)(wei)承壓含水(shui)層(ceng)厚(hou)(hou)度(du);為(wei)(wei)(wei)井群中(zhong)心點承壓含水(shui)層(ceng)的(de)水(shui)頭(tou)或潛水(shui)含水(shui)層(ceng)厚(hou)(hou)度(du);為(wei)(wei)(wei)基(ji)坑(keng)影響半徑,即井群中(zhong)心至補(bu)給邊界(jie)的(de)距(ju)離,,其中(zhong),為(wei)(wei)(wei)圓形(xing)井群半徑,為(wei)(wei)(wei)井的(de)影響半徑。
24、本發明(ming)具(ju)有的優點和積極效果是:
25、一、本方法適用(yong)(yong)于地下(xia)水豐富(即(ji)富水地層),土(tu)層復(fu)雜(20多層)的(de)超(chao)深基(ji)坑(28m),對于普通(tong)地層,普通(tong)基(ji)坑同(tong)樣(yang)適用(yong)(yong)。土(tu)層越多,理化性(xing)質越復(fu)雜,為減(jian)少土(tu)體(ti)不規則帶來的(de)偶然(ran)性(xing),該方法首先依據土(tu)體(ti)理化性(xing)質及地下(xia)水分(fen)布情況,對基(ji)坑工(gong)程影響范(fan)圍內的(de)土(tu)體(ti)進(jin)行分(fen)層,并采用(yong)(yong)加權平均法計算分(fen)層后的(de)質量(liang)密(mi)度、天然(ran)含(han)水率、孔隙(xi)比、滲透(tou)系數等土(tu)體(ti)參數。
26、本方(fang)法(fa)止(zhi)水帷(wei)幕(mu)(mu)為三(san)軸(zhou)攪拌樁(zhuang)止(zhi)水帷(wei)幕(mu)(mu),同樣適用(yong)于高壓(ya)旋噴樁(zhuang)或地下(xia)連續墻等(deng)其他(ta)形式止(zhi)水帷(wei)幕(mu)(mu)。
27、二、本發明中,止(zhi)(zhi)水(shui)(shui)帷(wei)幕(mu)(mu)不同(tong)漏點位置(zhi)是指,依據(ju)土(tu)(tu)體(ti)分層(ceng)(ceng)(ceng)結果(guo)及(ji)止(zhi)(zhi)水(shui)(shui)帷(wei)幕(mu)(mu)在多層(ceng)(ceng)(ceng)土(tu)(tu)體(ti)中所涉(she)及(ji)的(de)不同(tong)土(tu)(tu)層(ceng)(ceng)(ceng)種類。與(yu)其他(ta)方法(fa)不同(tong)的(de)是,本方法(fa)選取各(ge)土(tu)(tu)層(ceng)(ceng)(ceng)中間位置(zhi)與(yu)相鄰(lin)土(tu)(tu)層(ceng)(ceng)(ceng)的(de)交界面處,以(yi)模擬止(zhi)(zhi)水(shui)(shui)帷(wei)幕(mu)(mu)在各(ge)土(tu)(tu)層(ceng)(ceng)(ceng)內部與(yu)相鄰(lin)土(tu)(tu)層(ceng)(ceng)(ceng)之(zhi)間發生滲漏時的(de)情況,該做法(fa)可更好模擬止(zhi)(zhi)水(shui)(shui)帷(wei)幕(mu)(mu)不同(tong)位置(zhi)處的(de)水(shui)(shui)力坡度變化(hua)趨(qu)勢,更貼合(he)工程(cheng)實際情況。
28、三、此外(wai),止(zhi)(zhi)水(shui)帷(wei)幕易漏點判定方法:根(gen)據有限元模型模擬結果,分析(xi)止(zhi)(zhi)水(shui)帷(wei)幕前后位(wei)置處水(shui)力(li)(li)坡(po)(po)(po)度(du)隨深(shen)度(du)的(de)(de)變(bian)化,找(zhao)出(chu)不(bu)同漏點位(wei)置時(shi)的(de)(de)最(zui)大(da)水(shui)力(li)(li)坡(po)(po)(po)度(du)與對(dui)應(ying)深(shen)度(du);利用origin圖軟(ruan)件(jian)對(dui)不(bu)同漏點位(wei)置時(shi)的(de)(de)最(zui)大(da)水(shui)力(li)(li)坡(po)(po)(po)度(du)進(jin)行(xing)擬合,擬合出(chu)止(zhi)(zhi)水(shui)帷(wei)幕發(fa)生(sheng)滲漏時(shi)的(de)(de)水(shui)力(li)(li)坡(po)(po)(po)度(du)變(bian)化曲(qu)線(xian),找(zhao)出(chu)該擬合曲(qu)線(xian)的(de)(de)峰值及對(dui)應(ying)深(shen)度(du),該峰值即為(wei)多層土體(ti)中止(zhi)(zhi)水(shui)帷(wei)幕的(de)(de)最(zui)大(da)水(shui)力(li)(li)坡(po)(po)(po)度(du),將此峰值與臨界水(shui)力(li)(li)坡(po)(po)(po)度(du)進(jin)行(xing)對(dui)比,判定多層土體(ti)中止(zhi)(zhi)水(shui)帷(wei)幕的(de)(de)易漏點。